Truck Crane Cal-1 Training Test Paper

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| By Shashidhar Chaudhari
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Shashidhar Chaudhari
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Quizzes Created: 1 | Total Attempts: 100
Questions: 50 | Attempts: 100

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Truck Crane Cal-1 Training Test Paper - Quiz

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Questions and Answers
  • 1. 

    The Engine power transform into hydraulic power is equal to?

    • A.

      Pressure x Area

    • B.

      Force x Area

    • C.

      Pressure x Displacement

    • D.

      Pressure x Torque

    Correct Answer
    C. Pressure x Displacement
    Explanation
    The correct answer is Pressure x Displacement. When engine power is transformed into hydraulic power, it is the product of pressure and displacement that determines the hydraulic power. Pressure represents the force applied to the fluid, while displacement refers to the distance the fluid is moved. Therefore, multiplying pressure and displacement gives the hydraulic power generated by the engine.

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  • 2. 

     The given picture is which  type of valve

    • A.

      Manually operated 3 positions 4 ways, spring centred, open centred. 

    • B.

      Manually operated 3 positions 4 ways, spring centred, close centred.   

    • C.

      Manually operated 3 positions 4 ways, off set, open centred.   

    • D.

      Manually operated 3 positions 4 ways, off set, close centred.

    Correct Answer
    D. Manually operated 3 positions 4 ways, off set, close centred.
    Explanation
    The given picture is a manually operated valve with 3 positions and 4 ways. It is "off set" because the valve has an offset position in which it is neither fully open nor fully closed. It is "close centred" because in the offset position, the valve is closed.

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  • 3. 

    In STC 250 crane outrigger horizontal cylinder is protected against throwing out in driving mode.

    • A.

      Simple check valve

    • B.

      Controlled check valve

    • C.

      Counter balance valve

    • D.

      Hydraulic lock

    Correct Answer
    B. Controlled check valve
    Explanation
    A controlled check valve is used to protect the horizontal cylinder in the STC 250 crane outrigger from throwing out in driving mode. This valve allows the flow of hydraulic fluid in one direction while preventing it from flowing in the opposite direction. It ensures that the cylinder remains stable and does not extend or retract unintentionally during driving, providing safety and stability to the crane.

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  • 4. 

    Which reason will cause no luffing down?

    • A.

      Over Load

    • B.

      Over moment

    • C.

      One out rigger pressure is zero

    • D.

      Either 1 & 2 

    Correct Answer
    D. Either 1 & 2 
    Explanation
    If either the overload or over moment is present, it will cause no luffing down. This means that if the load on the crane exceeds its capacity (overload) or if the moment on the crane exceeds the maximum allowed (over moment), the crane will not luff down. This is because luffing down refers to the lowering of the jib or boom of a crane, and in the presence of overload or over moment, the crane will not be able to lower its jib or boom. Therefore, both reasons 1 and 2 will cause no luffing down.

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  • 5. 

    Flow through an orifice is controlled by?

    • A.

      Size of orifice

    • B.

      Temperature of the oil

    • C.

      Pressure difference across the orifice

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The flow through an orifice is controlled by all of the above factors. The size of the orifice determines the amount of fluid that can pass through it. The temperature of the oil affects its viscosity, which in turn affects the flow rate. The pressure difference across the orifice is the driving force for the flow, as it determines the velocity of the fluid. Therefore, all three factors play a role in controlling the flow through an orifice.

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  • 6. 

    The bypass valve associated with oil cooler opens when?

    • A.

      The oil is very thick at very cold temperature.

    • B.

      Cooler tubes are chocked.

    • C.

      When the flow rate is less.

    • D.

      Either 1 or 2

    Correct Answer
    D. Either 1 or 2
    Explanation
    The bypass valve associated with the oil cooler opens when either the oil is very thick at a very cold temperature or when the cooler tubes are choked. In both of these scenarios, the normal flow of oil through the cooler is hindered, and the bypass valve opens to allow the oil to bypass the cooler and continue circulating through the engine.

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  • 7. 

    The characteristics of variable displacement pump is? 

    • A.

      Flow depends on engine speed

    • B.

      Flow depends on swash plate angle.

    • C.

      Flow depends on 1 & 2

    • D.

      None

    Correct Answer
    C. Flow depends on 1 & 2
    Explanation
    Variable displacement pumps are designed to vary the flow rate of fluid being pumped. The characteristics of a variable displacement pump include the flow rate being dependent on both the engine speed and the swash plate angle. The engine speed determines the rotational speed of the pump, while the swash plate angle controls the displacement volume of the pump. Therefore, the correct answer is that the flow depends on both the engine speed and the swash plate angle.

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  • 8. 

    Oil is used in hydraulic system for?

    • A.

      Power transmission.

    • B.

      Cleaning & Sealing.

    • C.

      Lubrication & cooling.

    • D.

      All of the above.

    Correct Answer
    D. All of the above.
    Explanation
    Oil is used in hydraulic systems for power transmission, as it is able to transfer force and energy effectively. It is also used for cleaning and sealing, as it helps to remove contaminants and maintain proper functioning of the system. Additionally, oil is used for lubrication and cooling, as it reduces friction between moving parts and dissipates heat generated during operation. Therefore, all of the given options are valid uses of oil in hydraulic systems.

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  • 9. 

    Type of valve used to regulate the flow?

    • A.

      Main relief valve.

    • B.

      Variable orifice.

    • C.

      Fixed orifice.

    • D.

      Any one

    Correct Answer
    B. Variable orifice.
    Explanation
    A variable orifice is a type of valve that is used to regulate the flow. Unlike a fixed orifice, which has a fixed size opening, a variable orifice allows for adjustment of the opening size, thereby controlling the flow rate. This type of valve is commonly used in various applications where precise flow control is required, such as in hydraulic systems or process industries.

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  • 10. 

    On the page of LMI working condition setting, we can set which parameter ?

    • A.

      Boom length.

    • B.

      Wire rope fall.

    • C.

      Hook model

    • D.

      All

    Correct Answer
    C. Hook model
    Explanation
    On the page of LMI working condition setting, we can set the hook model parameter. This means that we have the option to choose and specify the type or model of hook that will be used in the working conditions. By setting the hook model, we ensure that the correct specifications and limitations for that particular hook are taken into account during the operation of the LMI system.

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  • 11. 

    In Sany truck crane 04 section boom single cylinder rope telescopic system_

    • A.

      2nd section telescope by cylinder and 3rd & 4th section by rope and drum mechanism.

    • B.

      Fist 2nd section than 3rd and 4th by cylinder only.

    • C.

      Simultaneously 2nd section by cylinder and 3rd & 4th by rope mechanism. 

    • D.

      Both 1 & 3

    Correct Answer
    C. Simultaneously 2nd section by cylinder and 3rd & 4th by rope mechanism. 
    Explanation
    The correct answer is "Simultaneously 2nd section by cylinder and 3rd & 4th by rope mechanism." This means that the second section of the boom is telescoped using a cylinder, while the third and fourth sections are telescoped using a rope and drum mechanism. This allows for efficient and controlled extension of the boom sections, with the second section extending first followed by the third and fourth sections.

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  • 12. 

    In a hydraulic system pressure is caused by ?

    • A.

      Restriction to the flow.

    • B.

      Blockage in the pipe line.

    • C.

      Induced load.

    • D.

      All

    Correct Answer
    D. All
    Explanation
    In a hydraulic system, pressure can be caused by various factors. Restriction to the flow, such as a narrow passage or a valve, can increase the pressure. Blockage in the pipeline, such as a clog or a closed valve, can also cause pressure to build up. Additionally, the pressure can be induced by the load being applied to the system, such as a heavy object being lifted or pushed. Therefore, all of these factors can contribute to the generation of pressure in a hydraulic system.

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  • 13. 

    In Sany truck crane 05 section boom to cylinder rope telescopic system;

    • A.

      2nd section telescope by cylinder 1and 3rd ,4th and 5th section by rope mechanism .

    • B.

      2nd and 3rd section by cylinder 1 and 2 respectively and 4th and 5th  by rope mechanism simultaneously by cyl-2.

    • C.

      2nd section extended by cyl -1 and rest  by cyl -2.

    • D.

      Section 2 and 3 by cyl -1 and section 3 ,4 and 5 by cyl -2.

    Correct Answer
    B. 2nd and 3rd section by cylinder 1 and 2 respectively and 4th and 5th  by rope mechanism simultaneously by cyl-2.
    Explanation
    The 2nd and 3rd sections of the Sany truck crane are extended using cylinder 1 and cylinder 2 respectively. On the other hand, the 4th and 5th sections are extended using a rope mechanism, which is operated simultaneously by cylinder 2. The 2nd section is extended solely by cylinder 1, while the rest of the sections (3, 4, and 5) are extended by cylinder 2.

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  • 14. 

    Use of 2nd length sensor in 5 section boom truck crane is?

    • A.

      To measure the length of 3rd4th and 5th section.

    • B.

      To measure the length of 2nd  section only.

    • C.

      2nd length section is optional.

    • D.

      2nd is stand by for 1st sensor.

    Correct Answer
    B. To measure the length of 2nd  section only.
    Explanation
    The use of the 2nd length sensor in a 5 section boom truck crane is to measure the length of the 2nd section only. This means that the sensor is specifically designed to provide accurate measurements for the 2nd section of the crane's boom. It does not measure the length of the 3rd, 4th, or 5th sections.

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  • 15. 

    In a single cylinder cross-pin boom telescopic mechanism system;

    • A.

      1 cyl can control all boom section extension and retraction.

    • B.

      2nd section by cyl and 3rd, 4th and 5th by rope.

    • C.

      Either A and B.

    • D.

      None.

    Correct Answer
    A. 1 cyl can control all boom section extension and retraction.
    Explanation
    The correct answer is that one cylinder can control all boom section extension and retraction. This means that only one cylinder is needed to operate the entire telescopic mechanism system, making it more efficient and cost-effective. The other option mentioned, using a combination of a cylinder and ropes, would require more components and potentially be more complicated to operate. Therefore, the most practical and logical choice would be to use a single cylinder for controlling all boom section movements.

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  • 16. 

    What I the line pull of STC 1000 truck crane if crane have max provision of 10 no. of fall?

    • A.

      5 ton.

    • B.

      10 ton.

    • C.

      12.5 ton.

    • D.

      8 ton.

    Correct Answer
    B. 10 ton.
    Explanation
    The line pull of a crane refers to the maximum force that can be exerted on the hoisting ropes. In this case, the STC 1000 truck crane has a maximum provision of 10 falls, which means that the ropes can be arranged in 10 separate lines. The line pull of the crane is determined by the number of falls and the load capacity. Since the question does not provide the load capacity, we can assume that it is 10 tons based on the given answer. Therefore, the correct answer is 10 ton.

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  • 17. 

    The main reason for hydraulic tank in an hydraulic system is to ?

    • A.

      Hold enough fluid for the circuit.

    • B.

      Decelerate the returned fluid .

    • C.

      To clean the fluid.

    • D.

      All.

    Correct Answer
    A. Hold enough fluid for the circuit.
    Explanation
    The main reason for a hydraulic tank in a hydraulic system is to hold enough fluid for the circuit. This is necessary because hydraulic systems require a certain amount of fluid to function properly. The tank ensures that there is a sufficient supply of fluid available for the system to operate effectively. Without a proper amount of fluid in the tank, the hydraulic system would not be able to generate the necessary force and pressure to perform its intended tasks.

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  • 18. 

    The purpose of one way restrictor in slewing brake circuit is?

    • A.

      To apply the brake quickly .

    • B.

      To apply the brake slowly.

    • C.

      To release the brake quickly.

    • D.

      Apply and release slowly.

    Correct Answer
    B. To apply the brake slowly.
    Explanation
    The purpose of a one-way restrictor in the slewing brake circuit is to apply the brake slowly. This is because the one-way restrictor restricts the flow of fluid in one direction, allowing for a controlled and gradual application of the brake. By applying the brake slowly, it helps to prevent sudden jolts or jerks, ensuring a smooth and safe operation.

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  • 19. 

    The purpose of free swing switch in swing circuit is to ?

    • A.

      Apply the brake in swing motor.

    • B.

      Connect port A and B.

    • C.

      Release the brake.

    • D.

      2 and 3 both.

    Correct Answer
    D. 2 and 3 both.
    Explanation
    The purpose of a free swing switch in a swing circuit is to both connect port A and B and release the brake. This switch allows the swing motor to move freely without any resistance from the brake, enabling the swing to move smoothly and easily.

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  • 20. 

    In variable torque/ speed hydraulic motor when servo piston is at Vgmax?

    • A.

      Only bigger chamber will receive the oil.

    • B.

      Both the chamber or servo piston will receive the oil.

    • C.

      Only small chamber will receive the oil.

    • D.

      All of the above.

    Correct Answer
    C. Only small chamber will receive the oil.
    Explanation
    When the servo piston is at Vgmax in a variable torque/speed hydraulic motor, only the small chamber will receive the oil. This is because at Vgmax, the flow of oil is directed towards the smaller chamber, causing it to expand and generate torque. The bigger chamber, on the other hand, does not receive any oil flow in this position. Therefore, the correct answer is that only the small chamber will receive the oil.

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  • 21. 

    In a low resistance circuit _____?

    • A.

      Voltage is very low.

    • B.

      Current flow is very low.

    • C.

      Voltage is very high.

    • D.

      Current flow is very high.

    Correct Answer
    D. Current flow is very high.
    Explanation
    In a low resistance circuit, the flow of current is very high. This is because resistance is inversely proportional to current according to Ohm's Law. When resistance is low, it allows for a greater flow of electric current. Therefore, in a low resistance circuit, the current flow is very high.

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  • 22. 

    In an electrical circuit voltage decreases, current flow___?

    • A.

      Increases.

    • B.

      Decreases.

    • C.

      Constent.

    • D.

      Variable.

    Correct Answer
    B. Decreases.
    Explanation
    In an electrical circuit, voltage and current are inversely proportional to each other according to Ohm's Law. As voltage decreases, the current flow also decreases. This is because the resistance in the circuit remains constant, and as voltage decreases, there is less potential difference to push the electrons through the circuit, resulting in a decrease in current flow.

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  • 23. 

    Function of alternator fitted in engine is_____ ?

    • A.

      To charge the battery only.

    • B.

      To start the engine.

    • C.

      To provide DC power to all electrical component.

    • D.

      Both 1 and 3.

    Correct Answer
    D. Both 1 and 3.
    Explanation
    The alternator fitted in the engine has the function of both charging the battery and providing DC power to all electrical components. It is responsible for converting mechanical energy into electrical energy, which is then used to charge the battery and power the electrical systems in the vehicle. Therefore, both options 1 and 3 are correct.

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  • 24. 

    A limit switch is to_____ ?

    • A.

       start the control circuit.

    • B.

      Close the relay contact.

    • C.

      Signal the end of an event.

    • D.

      Indicate when the circuit is energized.

    Correct Answer
    C. Signal the end of an event.
    Explanation
    A limit switch is a type of switch that is used to signal the end of an event or a specific condition. It is commonly used in industrial applications to detect the presence or absence of an object, and once that condition is met, it sends a signal to indicate that the event has ended. This can be used to control various processes or machinery, ensuring that they stop or change their operation once a certain condition is reached. Therefore, the correct answer is "Signal the end of an event."

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  • 25. 

    The function of diode is/are to ?

    • A.

      Helps to convert AC to DC voltage.

    • B.

      Allow electricity to flow in only one direction.

    • C.

      To protect relays/solenoids against voltage spike.

    • D.

      All of the above.

    Correct Answer
    D. All of the above.
    Explanation
    The function of a diode is to perform multiple tasks. Firstly, it helps in converting AC voltage to DC voltage by allowing the current to flow in one direction only. Additionally, it acts as a one-way gate for electricity, allowing it to flow in only one direction while blocking it in the opposite direction. Lastly, diodes are also used to protect relays and solenoids against voltage spikes by diverting excessive voltage away from the sensitive components. Therefore, the correct answer is "All of the above."

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  • 26. 

    Priority valve is ____?

    • A.

      Normally open.

    • B.

      Normally close and open at set pressure.

    • C.

      Normally close.

    • D.

      Normally open and close at set pressure.

    Correct Answer
    B. Normally close and open at set pressure.
    Explanation
    A priority valve is a type of valve that is designed to open and close at a set pressure. This means that it remains closed until the pressure reaches a certain level, at which point it opens to allow fluid or gas to flow through. Once the pressure drops below the set level, the valve closes again. This functionality allows the priority valve to regulate the flow of fluid or gas in a system, ensuring that it is only allowed to pass through when the pressure is within the desired range.

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  • 27. 

     

    • A.

      Priority valve.

    • B.

      Relief valve.

    • C.

      Reducing valve.

    • D.

      Differential valve.

    Correct Answer
    D. Differential valve.
    Explanation
    A differential valve is a type of valve that maintains a constant pressure difference between two fluid streams. It is commonly used in hydraulic systems to control the flow and pressure of fluids. The other options, such as a relief valve, reducing valve, and priority valve, do not specifically regulate pressure differences between fluid streams. Therefore, the correct answer is the differential valve.

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  • 28. 

    Given valve is ?

    • A.

      Pressure Differential

    • B.

      Pressure Safety.

    • C.

      Pressure Reducing.

    • D.

       Sequential.

    Correct Answer
    C. Pressure Reducing.
    Explanation
    The given options are related to pressure control in valves. "Pressure Differential" refers to the difference in pressure across the valve, "Pressure Safety" implies a valve designed to prevent pressure from exceeding a certain limit, and "Sequential" suggests a valve that operates in a specific order. However, "Pressure Reducing" is the correct answer as it indicates a valve that is used to decrease the pressure of a fluid flowing through it.

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  • 29. 

    Find the correct statement in case of piston motor ?

    • A.

      Max. angle, Max displacement , Min torque and max RPM.

    • B.

      Max. angle, Max displacement , max torque and min RPM.

    • C.

      Max. angle, Max displacement , Min torque and min RPM.

    • D.

      None.

    Correct Answer
    B. Max. angle, Max displacement , max torque and min RPM.
    Explanation
    This statement is the correct answer because in the case of a piston motor, the maximum angle refers to the maximum rotation that the piston can achieve. Max displacement refers to the maximum volume of the cylinder that the piston can displace. Max torque refers to the maximum twisting force that the motor can generate, and min RPM refers to the minimum number of revolutions per minute that the motor can achieve.

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  • 30. 

    In a truck crane at what % of moment controller will cut off the hoist up operation ?

    • A.

      10%

    • B.

      90%

    • C.

      30%

    • D.

      100%

    Correct Answer
    D. 100%
    Explanation
    The moment controller in a truck crane will cut off the hoist up operation when the load reaches 100% of its maximum capacity. This means that the crane is not designed to lift any additional weight beyond its maximum limit, and the moment controller ensures that the hoist operation is stopped to prevent any damage or accidents.

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  • 31. 

     Name of symbol is?

    • A.

      Main winch and luffing.

    • B.

      Telescopic and luffing.

    • C.

      Telescopic and AUX winch.

    • D.

      None.

    Correct Answer
    C. Telescopic and AUX winch.
    Explanation
    The correct answer is "Telescopic and AUX winch." This answer suggests that the name of the symbol is related to a telescopic feature and an auxiliary winch. It implies that the symbol represents a specific type of equipment or machinery that includes both of these components. The other options, such as "Main winch and luffing" and "Telescopic and luffing," do not fully capture the combination of features mentioned in the correct answer.

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  • 32. 

    If only the piston seal in the fig shown where to leak, theoretically the cylinder road whould ?

    • A.

      Lock up completely .

    • B.

      Remain stationery

    • C.

      Drift in slowly .

    • D.

      Leak fluid

    Correct Answer
    B. Remain stationery
    Explanation
    If only the piston seal in the figure shown were to leak, the cylinder rod would remain stationary. This is because the piston seal is responsible for preventing fluid leakage between the piston and cylinder wall, ensuring that the pressure is maintained and the rod does not move. If the seal were to leak, the pressure would not be maintained, causing the rod to stay stationary.

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  • 33. 

    When the moment torque is_____ winch high and low speed can be shifted freely.

    • A.

      >10%

    • B.

      >55%

    • C.

      10~55%

    • D.

      15~55%

    Correct Answer
    B. >55%
    Explanation
    When the moment torque is greater than 55%, the winch can be shifted freely between high and low speeds. This means that the winch has enough power to handle heavy loads and can operate efficiently at high speeds. If the moment torque is less than 55%, the winch may not be able to handle heavy loads or operate at high speeds effectively.

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  • 34. 

    Integrated circuit (IC) consist of?

    • A.

      Diode, capacitor and transistor.

    • B.

      Diode, capacitor and transistor and resistor.

    • C.

      Diode, transistor and resistor.

    • D.

      Diode, capacitor and transistor , resistor andTX.

    Correct Answer
    C. Diode, transistor and resistor.
    Explanation
    An integrated circuit (IC) is a small electronic device that consists of multiple components such as diodes, transistors, and resistors integrated onto a single semiconductor chip. These components work together to perform various functions such as amplification, switching, and signal processing. The presence of diodes allows for the control of current flow, transistors enable amplification and switching, and resistors regulate the flow of current within the circuit. Therefore, the correct answer is "Diode, transistor, and resistor."

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  • 35. 

    What is SWL of 16mm steel wire ceiling?

    • A.

      2048kg

    • B.

      2048 ton

    • C.

      1600kg

    • D.

      1600 ton

    Correct Answer
    A. 2048kg
    Explanation
    The SWL (Safe Working Load) of a 16mm steel wire ceiling is 2048kg. This means that the maximum weight that can be safely supported by the ceiling is 2048kg.

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  • 36. 

    Orbital valve is used in which hydraulic circuit of Sany machine ?

    • A.

      Travelling circuit.

    • B.

      Stearing circuit. 

    • C.

      Brake circuit.

    • D.

      Accelerator circuit

    Correct Answer
    B. Stearing circuit. 
    Explanation
    The orbital valve is used in the steering circuit of a Sany machine. This valve is responsible for controlling the flow of hydraulic fluid to the steering mechanism, allowing the operator to turn the machine left or right. It is an essential component in ensuring smooth and precise steering control for the machine.

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  • 37. 

    Find the current through the 4ohm resistor when V1 and V3 is open circuit?

    • A.

      9Ams.

    • B.

      0Ams.

    • C.

      3Ams.

    • D.

      12Ams.

    Correct Answer
    C. 3Ams.
    Explanation
    When V1 and V3 are open circuits, it means that no current is flowing through them. Therefore, the current can only flow through the 4ohm resistor. According to Ohm's Law (V = IR), the current flowing through a resistor is equal to the voltage across it divided by its resistance. Since the voltage across the 4ohm resistor is not given, we cannot calculate the exact current. However, based on the given options, the closest answer is 3Ams.

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  • 38. 

    In a given below circuit modification to avoid uncontrolled fall of platen? V

    • A.

      Connect counter balance valve on piston chamber port.

    • B.

      Connect counter balance valve on rod chamber port.

    • C.

      Connect counter balance valve on both piston and rod chamber port.

    • D.

      Any one.

    Correct Answer
    B. Connect counter balance valve on rod chamber port.
    Explanation
    The correct answer is to connect a counter balance valve on the rod chamber port. This is because a counter balance valve is used to control the flow of fluid in a hydraulic system, specifically to prevent uncontrolled movement of a load. By connecting the counter balance valve on the rod chamber port, it will help to regulate the flow of fluid and prevent the platen from falling uncontrollably.

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  • 39. 

    In Sany truck crane engine accelerator can be controlled?

    • A.

      From driver cabin only.

    • B.

      From both operator and driver cabin.

    • C.

      From driver cabin, operator cabin and outrigger throttle.

    • D.

      None.

    Correct Answer
    C. From driver cabin, operator cabin and outrigger throttle.
    Explanation
    The correct answer is "From driver cabin, operator cabin, and outrigger throttle." This means that in a Sany truck crane, the engine accelerator can be controlled from both the driver cabin and the operator cabin, as well as through the outrigger throttle. This allows for convenient and flexible control of the engine acceleration in different situations and from different locations within the crane.

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  • 40. 

    What is full form of CRDI system used in electronic engine?

    • A.

      Common injection system.

    • B.

      Common rail direct injection system.

    • C.

      Common rapid diffusion system.

    • D.

      Common reserve direct injection system.

    Correct Answer
    B. Common rail direct injection system.
    Explanation
    The correct answer is "Common rail direct injection system." This system is used in electronic engines and refers to a fuel injection system where fuel is delivered to the engine cylinders at high pressure through a common rail. This allows for precise control over the fuel injection process, resulting in improved fuel efficiency, reduced emissions, and better engine performance.

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  • 41. 

    For SAC 2200 model, when operating luffing down, the luffing system pressure will be ?

    • A.

      0Mpa

    • B.

      8Mpa

    • C.

      10Mpa

    • D.

      18Mpa

    Correct Answer
    A. 0Mpa
    Explanation
    When operating luffing down, the luffing system pressure will be 0Mpa. This means that there is no pressure in the luffing system when it is operating in the downward direction.

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  • 42. 

    The qualified hydraulic lock standard is; oil leaking____ drop/minute?

    • A.

      ≤100

    • B.

      ≤5

    • C.

      ≤50

    • D.

      ≤15

    Correct Answer
    D. ≤15
    Explanation
    The qualified hydraulic lock standard is that oil leaking should be less than or equal to 15 drops per minute.

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  • 43. 

    Which part failure will leads to slow operation of swing motor?

    • A.

      Chassis multi-way valve leaking.

    • B.

      Swing pump leaking.

    • C.

      Centre joint leaking.

    • D.

      All of the above.

    Correct Answer
    D. All of the above.
    Explanation
    All of the above options can lead to a slow operation of the swing motor. If the chassis multi-way valve is leaking, it can result in a loss of hydraulic pressure, causing the motor to operate slowly. Similarly, if the swing pump is leaking, it will not be able to provide sufficient hydraulic fluid to the motor, resulting in slow operation. Additionally, if the center joint is leaking, it can cause a loss of hydraulic pressure, affecting the motor's speed. Therefore, all three options can contribute to the slow operation of the swing motor.

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  • 44. 

    Cushioning valve fitted in which system?

    • A.

      Aux. winch.

    • B.

      Slewing.

    • C.

      Luffing.

    • D.

      Telescopic.

    Correct Answer
    B. Slewing.
    Explanation
    A cushioning valve is fitted in the slewing system. The slewing system is responsible for rotating the crane horizontally. The cushioning valve helps to control the speed and movement of the slewing system, providing a smooth and controlled rotation. This valve helps to prevent sudden jolts or jerks during the slewing operation, ensuring the safety and stability of the crane.

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  • 45. 

    Which one of the following valves uses a check to isolate a part of the circuit?

    • A.

      Brake valve.

    • B.

      Unloading valve.

    • C.

      Counter balance valve.

    • D.

      Pressure relief valve.

    Correct Answer
    B. Unloading valve.
    Explanation
    The unloading valve is the correct answer because it uses a check to isolate a part of the circuit. A check valve allows flow in one direction while preventing backflow in the opposite direction. In the case of an unloading valve, it is used to isolate a specific part of the circuit by allowing flow into that part but preventing flow out of it. This allows for the unloading of pressure in a controlled manner without affecting the rest of the circuit.

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  • 46. 

    Which 5 characteristics does the valve below have?

    • A.

      Normally closed, 2 position,2 ways, spring return and solenoid operated .

    • B.

      Normally open, 2 position, 2 ways, spring return and solenoid operated.

    • C.

      Normally open, 2 position, 4 ways, spring return and solenoid operated.

    • D.

      Normally closed, 2 position, 4 ways, spring return and solenoid operated .

    Correct Answer
    A. Normally closed, 2 position,2 ways, spring return and solenoid operated .
    Explanation
    The valve below has the following characteristics: normally closed, 2 position, 2 ways, spring return, and solenoid operated.

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  • 47. 

    Unusual noise in a hydraulic system is caused by?

    • A.

      Restriction in inlet line.

    • B.

      Too high a drive speed.

    • C.

      Too much load.

    • D.

       both A and B.

    Correct Answer
    D.  both A and B.
    Explanation
    Unusual noise in a hydraulic system can be caused by both a restriction in the inlet line and too high a drive speed. A restriction in the inlet line can result in turbulent flow and increased pressure, leading to noise. Similarly, too high a drive speed can cause excessive fluid turbulence and pressure, resulting in noise. Therefore, both factors can contribute to the unusual noise observed in the hydraulic system.

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  • 48. 

    What is voltage across R1 resistance?

    • A.

      10 volts.

    • B.

      120 volts

    • C.

      100 volts.

    • D.

      None.

    Correct Answer
    C. 100 volts.
    Explanation
    The voltage across a resistor is determined by Ohm's Law, which states that the voltage (V) is equal to the current (I) flowing through the resistor multiplied by the resistance (R). Since the question does not provide any information about the current or the resistance value, it is not possible to determine the voltage across R1. Therefore, the correct answer cannot be determined.

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  • 49. 

    What is the total LPM of 02 Pumps of 140 cc/rev driven at 2000 RPM?

    • A.

      280

    • B.

      140

    • C.

      560

    • D.

      1120

    Correct Answer
    C. 560
    Explanation
    The total LPM (Liters per Minute) of the 02 pumps can be calculated by multiplying the cc/rev (cubic centimeters per revolution) by the number of revolutions per minute (RPM) and then dividing by 1000 to convert cc to liters. In this case, the calculation would be (140 cc/rev * 2000 RPM) / 1000 = 280 LPM. However, since there are 02 pumps, the total LPM would be double that, resulting in 560 LPM.

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  • 50. 

    What is the input and out put voltage for  throttle potentio meter ?

    • A.

      6 Volts-Input, out put- 0 to 5 volts, Rpm- 0-1900.

    • B.

      6 Volts-Input, out put- 0.5 to 5 volts, Rpm- 0-1900.

    • C.

      5 Volts-Input, out put- 0.85 to 4.2 volts, Rpm- 0-1900.

    • D.

      5 Volts-Input, out put- 0.85 to 4.2 volts, Rpm- 800-1900.

    Correct Answer
    D. 5 Volts-Input, out put- 0.85 to 4.2 volts, Rpm- 800-1900.
    Explanation
    The correct answer is 5 Volts-Input, out put- 0.85 to 4.2 volts, Rpm- 800-1900. This is the correct answer because it states that the input voltage is 5 Volts, the output voltage ranges from 0.85 to 4.2 volts, and the RPM ranges from 800 to 1900. This information indicates the specific voltage and RPM range for the throttle potentiometer.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 26, 2020
    Quiz Created by
    Shashidhar Chaudhari
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