Heroelectric - Isieindia - Klu Joint Industry Project

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Heroelectric - Isieindia - Klu Joint Industry Project - Quiz

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Questions and Answers
  • 1. 

    When a cold engine is started, it requires a _____________ mixture.

    • A.

      Leaner

    • B.

      Richer

    • C.

      Chemically equal

    • D.

      None of the mentioned

    Correct Answer
    B. Richer
    Explanation
    When a cold engine is started, it requires a richer mixture. This is because a richer mixture means there is a higher amount of fuel in relation to the amount of air. A cold engine needs more fuel to ignite and run smoothly, as the fuel is less likely to vaporize in cold temperatures. A richer mixture helps to compensate for this and ensures that the engine starts and runs properly.

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  • 2. 

    Positive camber is used to compensate for wheels tilting inward due to the weight of the vehicle.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Positive camber is used to compensate for wheels tilting inward due to the weight of the vehicle. When a vehicle is loaded, the weight causes the suspension to compress, which can result in the wheels tilting inward. Positive camber, which means the top of the wheels is tilted outward, is used to counteract this effect and keep the wheels perpendicular to the road surface. This helps to maintain optimal contact between the tires and the road, improving stability and handling. Therefore, the statement is true.

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  • 3. 

    if the valve clearances are excessively large, the problem that can arise is

    • A.

      Overheating of the engine

    • B.

      Incomplete valve closure

    • C.

      Fouling of spark plug by gasoline

    • D.

      None of these

    Correct Answer
    B. Incomplete valve closure
    Explanation
    If the valve clearances are excessively large, it can lead to incomplete valve closure. This means that the valves may not fully close when they should, resulting in a loss of compression in the engine. This can cause a decrease in engine performance, including reduced power and fuel efficiency. It can also lead to issues such as misfires and engine noise. Therefore, the correct answer is incomplete valve closure.

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  • 4. 

    The valve is opened as the cam lobe on the cam raises the

    • A.

      Bearing

    • B.

      Piston

    • C.

      Valve lifter

    • D.

      Valve seat

    Correct Answer
    C. Valve lifter
    Explanation
    The valve lifter is the component that is responsible for opening the valve. As the cam lobe on the camshaft rotates, it pushes against the valve lifter, causing it to move upward. This upward movement of the valve lifter then pushes against the valve, opening it and allowing the flow of air or fuel into the combustion chamber. Therefore, the valve lifter is the correct answer as it directly relates to the opening of the valve.

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  • 5. 

    A petrol engine of a car develops 125 N-m torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is

    • A.

      8.91 M

    • B.

      80.91 M

    • C.

      809.1 N-M

    • D.

      8091 N-M

    Correct Answer
    C. 809.1 N-M
    Explanation
    The torque available at the driving wheels can be calculated by multiplying the torque developed by the engine with the gear ratio and the final drive ratio, and then dividing by the transmission efficiency. In this case, the torque developed by the engine is 125 N-m, the gear ratio is 1.75, the final drive ratio is 4.11, and the transmission efficiency is 90%. Therefore, the torque available at the driving wheels is (125 N-m * 1.75 * 4.11) / 0.9 = 809.1 N-M.

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  • 6. 

    What does Heating and cooling of the atmosphere generates?

    • A.

      Thermo line circulation

    • B.

      Radiation currents

    • C.

      Convection currents

    • D.

      Conduction currents

    Correct Answer
    C. Convection currents
    Explanation
    Heating and cooling of the atmosphere generates convection currents. Convection is the process of heat transfer through the movement of fluid or gas. When the atmosphere is heated, the air molecules become less dense and rise, creating an upward flow. As the air cools, it becomes denser and sinks, creating a downward flow. This continuous cycle of rising and sinking air creates convection currents in the atmosphere, which play a crucial role in redistributing heat and moisture around the Earth.

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  • 7. 

    What is the main source for the formation of wind?

    • A.

      Uneven land

    • B.

      Sun

    • C.

      Vegetation

    • D.

      Seasons

    Correct Answer
    B. Sun
    Explanation
    The main source for the formation of wind is the Sun. Solar radiation heats the Earth's surface unevenly, causing air to rise in some areas and sink in others. This creates differences in air pressure, which in turn leads to the movement of air or wind. The Sun's energy is responsible for driving the Earth's weather systems and plays a crucial role in the formation of wind patterns across the globe.

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  • 8. 

    Material Requirements Planning DOES NOT include

    • A.

      ​​​​​​Material price

    • B.

      ​​​​​​Bill of material

    • C.

      ​​​​​​Inventory level

    • D.

      ​​​​​​Production schedule

    Correct Answer
    A. ​​​​​​Material price
    Explanation
    Material Requirements Planning (MRP) is a system used by businesses to manage and plan the materials required for production. It involves creating a bill of material, which outlines the components needed for a product, and determining the inventory level to ensure that materials are available when needed. Additionally, MRP helps in creating a production schedule to optimize production efficiency. However, material price is not a part of MRP as it is a separate consideration that involves pricing negotiations and procurement strategies.

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  • 9. 

    Maximum wind energy available is proportional to

    • A.

      Air density

    • B.

      Cube of wind velocity

    • C.

      Square of the rotor diameter

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The maximum wind energy available is determined by multiple factors. Firstly, air density plays a crucial role as denser air can carry more energy. Secondly, the cube of wind velocity is important because the kinetic energy of the wind is directly proportional to the cube of its speed. Lastly, the square of the rotor diameter affects the amount of wind that can be captured and converted into energy. Therefore, all three factors, air density, wind velocity, and rotor diameter, contribute to the maximum wind energy available.

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  • 10. 

    Which part will surely tell that given motor is DC motor and not an AC type?

    • A.

      Winding

    • B.

      Shaft

    • C.

      Commutator

    • D.

      Stator

    Correct Answer
    C. Commutator
    Explanation
    The commutator is a crucial component in a DC motor that helps to convert the alternating current (AC) supplied to the motor into direct current (DC). It consists of a segmented metal ring that is connected to the rotor winding. As the rotor rotates, the commutator ensures that the current flow in the rotor winding is always in the same direction, resulting in a DC motor. Therefore, the presence of a commutator indicates that the motor is a DC motor and not an AC type.

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  • 11. 

    Which pipe section is better for torsion ?

    • A.

      Channel

    • B.

      Box

    • C.

      Tubular

    • D.

      Rectangle

    Correct Answer
    C. Tubular
    Explanation
    Tubular pipe sections are better for torsion because they have a circular cross-section, which distributes the torsional forces evenly throughout the pipe. This design provides greater strength and resistance to twisting compared to other pipe sections such as channel, box, or rectangle, which have different cross-sectional shapes. The circular shape of the tubular section allows it to withstand torsional loads more effectively, making it the preferred choice for applications where torsion is a significant factor.

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  • 12. 

    Cast surfaces have good finishing.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement suggests that cast surfaces have good finishing, but the correct answer is false. Cast surfaces typically have rough finishes due to the nature of the casting process. The molten material is poured into a mold and solidifies, resulting in a textured surface. Additional finishing processes such as grinding or polishing may be required to achieve a smoother surface.

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  • 13. 

    Cells are connected in Series 

    • A.

      Increasing current rating

    • B.

      Increasing voltage rating

    • C.

      Increasing life

    Correct Answer
    B. Increasing voltage rating
    Explanation
    When cells are connected in series, the voltage ratings of each individual cell are added together. This means that the overall voltage rating of the series connection increases. Connecting cells in series does not affect the current rating or the life of the cells. Therefore, the correct answer is "Increasing voltage rating."

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  • 14. 

    Assuming power as constant , we need to increase ____ to increase speed.

    • A.

      RPM

    • B.

      Torque

    • C.

      Force

    • D.

      Acceleration

    Correct Answer
    A. RPM
    Explanation
    To increase speed, we need to increase the RPM (revolutions per minute). RPM refers to the number of rotations an object makes in a minute. Increasing the RPM means the object will rotate faster, resulting in an increase in speed.

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  • 15. 

    The device used to measure the clearance between the valve and tappet of an IC Engine is

    • A.

      Feeler gauge

    • B.

      Snap gauge

    • C.

      Slip gauge

    • D.

      Micrometer

    Correct Answer
    A. Feeler gauge
    Explanation
    A feeler gauge is a thin strip of metal with various thicknesses that is used to measure the clearance between the valve and tappet of an IC Engine. It is inserted between the valve and tappet to determine the gap. The correct answer is feeler gauge because it is specifically designed for this purpose and provides accurate measurements of the clearance.

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  • 16. 

    A jaw clutch is essentially a

    • A.

      Positive action clutch

    • B.

      Cone clutch

    • C.

      Friction clutch

    • D.

      Disc clutch

    Correct Answer
    A. Positive action clutch
    Explanation
    A positive action clutch refers to a type of clutch that engages and disengages with a positive and definite action, ensuring a reliable and precise connection between the driving and driven components. This type of clutch is designed to provide a strong and secure engagement, minimizing any possibility of slippage or power loss. It is commonly used in applications where a reliable and immediate transfer of power is required, such as in high-performance vehicles or heavy machinery.

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  • 17. 

    The torque developed by a disc clutch is given by

    • A.

      T = 0.25 µ.W.R

    • B.

      T = 0.5 µ.W.R

    • C.

      T = 0.75 µ.W.R

    • D.

      T = µ.W.R

    Correct Answer
    D. T = µ.W.R
    Explanation
    The torque developed by a disc clutch is given by the equation T = µ.W.R. This equation represents the relationship between the torque (T), the coefficient of friction (µ), the normal force (W), and the radius of the clutch (R). The coefficient of friction represents the interaction between the surfaces of the clutch and determines the amount of frictional force that can be generated. Therefore, the correct answer is T = µ.W.R, as it accurately represents the torque developed by a disc clutch.

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  • 18. 

    The axial force (We) required for engaging a cone clutch is given by

    • A.

      Wn sin α

    • B.

      Wn (sin α + µ cos α )

    • C.

      Wn (sin α + 0.25 µ cos α )

    • D.

      None of the mentioned

    Correct Answer
    C. Wn (sin α + 0.25 µ cos α )
    Explanation
    The correct answer is Wn (sin α + 0.25 μ cos α). This equation represents the axial force required for engaging a cone clutch. The axial force is dependent on the normal force (Wn), the angle of the cone (α), and the coefficient of friction (μ). The equation takes into account both the force due to the normal force and the force due to friction, with the frictional force being 0.25 times the normal force.

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  • 19. 

    In an isolated system, ________ can be transferred between the system and its surrounding

    • A.

      Only energy 

    • B.

      Only mass 

    • C.

      Both energy and mass 

    • D.

      Neither energy nor mass 

    Correct Answer
    C. Both energy and mass 
    Explanation
    In an isolated system, both energy and mass can be transferred between the system and its surroundings. This means that not only can energy be exchanged between the system and its surroundings, but also mass can be transferred. This implies that both the energy and mass of the system are not conserved, as they can change due to interactions with the surroundings.

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  • 20. 

    How is absolute pressure measured?

    • A.

      Gauge pressure + Atmospheric pressure 

    • B.

      Gauge pressure – Atmospheric pressure

    • C.

      Gauge pressure / Atmospheric pressure

    • D.

      None of the above

    Correct Answer
    A. Gauge pressure + Atmospheric pressure 
    Explanation
    Absolute pressure is the total pressure exerted by a fluid, including both the pressure exerted by the fluid itself and the pressure exerted by the surrounding atmosphere. To measure absolute pressure, one needs to consider both the gauge pressure (pressure measured relative to atmospheric pressure) and the atmospheric pressure. Therefore, the correct answer is "Gauge pressure + Atmospheric pressure".

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  • 21. 

    Which of the following relations depict relation between Celsius and Fahrenheit scale? 

    • A.

      (oC / 5) = (oF – 32) / 9

    • B.

      (oC / 9) = (oF – 32) / 5 

    • C.

      (oC / 32) = (oF – 9) / 5

    • D.

      None of the above

    Correct Answer
    A. (oC / 5) = (oF – 32) / 9
    Explanation
    The correct answer is (oC / 5) = (oF - 32) / 9. This equation represents the relationship between the Celsius and Fahrenheit scales. It states that to convert a temperature from Celsius to Fahrenheit, you need to multiply the Celsius value by 9/5 and then add 32.

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  • 22. 

    Precise petrol injection system is

    • A.

      Direct injection

    • B.

      Sequential injection

    • C.

      Throttle body injection

    • D.

      Port injection

    Correct Answer
    C. Throttle body injection
    Explanation
    Throttle body injection is a type of fuel injection system where fuel is injected into the throttle body, which is located between the air intake manifold and the engine intake valves. This system uses a single fuel injector that sprays fuel into the throttle body, allowing it to mix with the incoming air before entering the engine cylinders. Throttle body injection is less precise than direct injection or sequential injection, as it does not deliver fuel directly into each cylinder. However, it is a simpler and less expensive system to implement, making it a popular choice in some vehicles.

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  • 23. 

    In an automobile engine, indication of knocking is available in the form of

    • A.

      Light

    • B.

      Gas

    • C.

      Audible sound

    • D.

      None of the mentioned

    Correct Answer
    C. Audible sound
    Explanation
    In an automobile engine, knocking refers to the sound produced when the air-fuel mixture in the combustion chamber ignites prematurely or unevenly. This can occur due to various reasons such as improper fuel quality, incorrect ignition timing, or excessive heat. The knocking sound is typically a metallic pinging or rattling noise that can be heard from the engine. Therefore, the correct indication of knocking in an automobile engine is an audible sound.

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  • 24. 

    This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Sensor Systems”.Which of the following is correct for tactile sensors?

    • A.

      Touch sensitive

    • B.

      Pressure sensitive

    • C.

      Input voltage sensitive

    • D.

      Humidity sensitive

    Correct Answer
    A. Touch sensitive
    Explanation
    Tactile sensors are specifically designed to detect and measure physical touch or contact. They are sensitive to touch and can detect variations in pressure or force applied to them. Therefore, the correct answer is "Touch sensitive."

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  • 25. 

    What happens when the land near the earth’s equator is heated?

    • A.

      All the oceans gets heated up

    • B.

      Small wind currents are formed

    • C.

      Rise in tides

    • D.

      Large atmospheric winds are created

    Correct Answer
    D. Large atmospheric winds are created
    Explanation
    When the land near the earth's equator is heated, it causes the air above it to become warm and rise. As the warm air rises, it creates a low-pressure zone near the surface. The surrounding cooler air then rushes in to fill this void, creating large atmospheric winds. These winds, known as trade winds, blow from east to west and play a crucial role in shaping weather patterns and ocean currents around the world.

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  • 26. 

    _____ Motor is used in Ceiling Fan.

    • A.

      3 Phase Induction

    • B.

      1 Phase Induction

    • C.

      Hub Motor

    • D.

      BLDC

    Correct Answer
    B. 1 Phase Induction
    Explanation
    Ceiling fans typically use a 1 Phase Induction motor. This type of motor is commonly used in household appliances due to its simplicity, cost-effectiveness, and reliability. A 1 Phase Induction motor operates on a single-phase power supply, making it suitable for residential applications. It consists of a stator and a rotor, with the stator producing a rotating magnetic field that induces current in the rotor. This current creates a magnetic field in the rotor, causing it to rotate and drive the fan blades. Therefore, the correct answer is 1 Phase Induction.

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  • 27. 

    Single phase induction motor is self starting. 

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Single phase induction motors are not self-starting. Unlike three-phase induction motors, which can start on their own due to the rotating magnetic field produced by the three-phase power supply, single-phase induction motors require an external means to start. This can be achieved through the use of a starting capacitor or a centrifugal switch, which helps create an initial rotating magnetic field to initiate motor rotation. Therefore, the correct answer is false.

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  • 28. 

    What does Heating and cooling of the atmosphere generates?

    • A.

      Convection currents

    • B.

      Conduction currents

    Correct Answer
    A. Convection currents
    Explanation
    Heating and cooling of the atmosphere generate convection currents. When the atmosphere is heated, the air molecules gain energy and become less dense, causing them to rise. As the heated air rises, it creates a region of low pressure, which draws in cooler air from surrounding areas. This cooler air then gets heated and rises, creating a continuous cycle of rising warm air and sinking cool air. This movement of air due to temperature differences is known as convection, and it plays a crucial role in redistributing heat energy throughout the atmosphere.

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  • 29. 

    The characteristic that provides an output with respect to the relation with the input is called as 

    • A.

      Calibration of a system

    • B.

      Response of a system

    • C.

      Characteristic relation of a system

    • D.

      Instrumentation of a system

    Correct Answer
    B. Response of a system
    Explanation
    The characteristic that provides an output with respect to the relation with the input is called the response of a system. This means that when an input is given to a system, the response is the resulting output or behavior of the system. The response of a system can vary depending on the input and the characteristics of the system itself.

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  • 30. 

    How much power does the small scale wind machine generate?

    • A.

      2 KW

    • B.

      10 KW

    • C.

      20 KW

    • D.

      6 KW

    Correct Answer
    A. 2 KW
    Explanation
    The small scale wind machine generates 2 KW of power.

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  • 31. 

    In a cantilever of span subjected to a point load of w acting at a distance of (1/3) L from free end. The deflection under load will be

    • A.

      WL3/81 EI

    • B.

      14WL3/ 81EI

    • C.

      8WL3/81EI

    • D.

      WL3/64 EI

    Correct Answer
    C. 8WL3/81EI
    Explanation
    The deflection under load in a cantilever of span subjected to a point load can be determined using the formula: deflection = (WL^3) / (81EI), where W is the load, L is the span, E is the modulus of elasticity, and I is the moment of inertia. Therefore, the correct answer is 8WL^3 / 81EI.

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  • 32. 

    . In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

    • A.

      50° - 60°

    • B.

      60° - 70°

    • C.

      70° - 80°

    • D.

      80° - 90°

    Correct Answer
    D. 80° - 90°
  • 33. 

    In an exploded assembly drawing it is customary for the drafter to use a ________ line to illustrate how parts fit together.

    • A.

      Phantom

    • B.

      Hidden

    • C.

      Dashed

    • D.

      Center

    Correct Answer
    A. Phantom
    Explanation
    In an exploded assembly drawing, a phantom line is used to illustrate how parts fit together. A phantom line is a dashed line that shows the outline of an object that is not visible in the current view. It is commonly used to represent hidden or obscured parts in the assembly, allowing the drafter to show the relationship between different components and how they fit together.

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  • 34. 

    What is the angle made by force A with X and Y ?  (where X and Y are components of force A)

    • A.

      75.52o 

    • B.

      60.65o

    • C.

      14.03o

    • D.

      14.47o

    Correct Answer
    A. 75.52o 
    Explanation
    The angle made by force A with X and Y is 75.52o.

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  • 35. 

    Which method is used to determine centroid of a composite figure?

    • A.

      Analytical method

    • B.

      Graphical method

    • C.

      Both a. and b.

    • D.

      None of the above

    Correct Answer
    C. Both a. and b.
    Explanation
    The centroid of a composite figure can be determined using both the analytical method and the graphical method. The analytical method involves calculating the centroid by finding the average of the x and y coordinates of all the individual components of the figure. The graphical method involves drawing the figure on a graph and locating the point where the lines of symmetry intersect, which is the centroid. Therefore, both methods can be used to determine the centroid of a composite figure.

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  • 36. 

    Arrange the following components of temperature measurement system according to measurement system                            Hot body, Display system, Thermocouple, Amplifier and converter

    • A.

      Hot body----Display system-----Thermocouple-----Amplifier and converter

    • B.

      Hot body----Amplifier and converter-----Thermocouple-----Display system

    • C.

      Hot body----Thermocouple-----Amplifier and converter-----Display system 

    • D.

      Display system-----Hot body----Thermocouple-----Amplifier and converter

    Correct Answer
    C. Hot body----Thermocouple-----Amplifier and converter-----Display system 
    Explanation
    The correct answer is "Hot body----Thermocouple-----Amplifier and converter-----Display system". In a temperature measurement system, the hot body is the source of the temperature being measured. The thermocouple is the sensor that measures the temperature and converts it into an electrical signal. The amplifier and converter are used to amplify and convert the electrical signal from the thermocouple into a form that can be displayed on the display system. Therefore, the correct arrangement is hot body, thermocouple, amplifier and converter, and display system.

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  • 37. 

    The process of establishment of a relationship between the input to the instrument and output from the instrument is called as_____

    • A.

      Static sensitivity

    • B.

      Static characterization

    • C.

      Static accuracy

    • D.

      Static calibration 

    Correct Answer
    D. Static calibration 
    Explanation
    Static calibration refers to the process of establishing a relationship between the input and output of an instrument. It involves determining the instrument's response to known input values and creating a calibration curve or equation that can be used to accurately measure unknown input values based on the instrument's output. This calibration process ensures that the instrument provides accurate and reliable measurements.

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  • 38. 

    Load is gradually applied on a steel plate shown below, what is the modulus of resilience, if 130 N/mm2 is the maximum stress applied? (Assume E = 100 x 103 Mpa)

    • A.

      0.845 N/mm2

    • B.

      0.0845 N/mm2 

    • C.

      0.00845 N/mm2

    • D.

      Insufficient data

    Correct Answer
    B. 0.0845 N/mm2 
    Explanation
    The modulus of resilience is a measure of a material's ability to absorb energy without permanent deformation. It is calculated as the area under the stress-strain curve up to the elastic limit. In this case, the maximum stress applied is given as 130 N/mm2 and the modulus of elasticity (E) is given as 100 x 103 Mpa. The modulus of resilience can be calculated using the formula: Resilience = (1/2) * (σ^2 / E). Plugging in the values, we get Resilience = (1/2) * (130^2 / (100 x 103)) = 0.0845 N/mm2. Therefore, the correct answer is 0.0845 N/mm2.

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  • 39. 

    Micro-controllers are ________________ than the PLCs.

    • A.

      Bulky and expensive

    • B.

      Bulky but cheaper

    • C.

      Portable and cheaper 

    • D.

      Portable but expensive

    Correct Answer
    C. Portable and cheaper 
    Explanation
    Micro-controllers are considered to be portable and cheaper compared to PLCs. This is because micro-controllers are smaller in size and can be easily carried or moved around, making them portable. Additionally, micro-controllers are generally less expensive than PLCs, making them a more cost-effective option for certain applications.

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  • 40. 

    If an elevator travels at constant velocity, the normal reaction R is given as ______

    • A.

      M (g +a)

    • B.

      M (g - a)

    • C.

      Mg

    • D.

      Ma

    Correct Answer
    C. Mg
    Explanation
    When an elevator is traveling at a constant velocity, it means that there is no acceleration occurring. In this case, the normal reaction R, which is the force exerted by a surface to support the weight of an object resting on it, is equal to the weight of the object. The weight of an object is given by the equation m*g, where m represents the mass of the object and g represents the acceleration due to gravity. Therefore, the correct answer is mg.

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  • 41. 

    The concept of stream function which is based on the principle of continuity is applicable to

    • A.

      Three-dimensional flow

    • B.

      Two-dimensional flow

    • C.

      Irrotational flow only.

    • D.

      Uniform flow

    Correct Answer
    B. Two-dimensional flow
    Explanation
    The concept of stream function is applicable to two-dimensional flow because it is a mathematical tool used to describe the motion of a fluid in two dimensions. It helps to visualize the flow patterns and calculate important flow properties such as velocity and pressure. In two-dimensional flow, the fluid motion occurs in a plane, and the stream function represents the flow lines that are perpendicular to this plane. Therefore, it is not applicable to three-dimensional flow, uniform flow, or irrotational flow only.

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  • 42. 

    In Ideal case, the Charging current for 200Ah battery would be _________ ?

    • A.

      10A

    • B.

      20A

    • C.

      30A

    • D.

      40A

    Correct Answer
    B. 20A
    Explanation
    The ideal charging current for a 200Ah battery would be 20A. This is because the charging current should be around 10% of the battery's capacity for optimal charging. In this case, 10% of 200Ah is 20A.

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  • 43. 

    In Real case, the Charging current for 200Ah battery would be

    • A.

      20-22 A

    • B.

      14-16 A

    • C.

      12-14 A

    • D.

      10-12 A

    Correct Answer
    A. 20-22 A
    Explanation
    The correct answer is 20-22 A because a 200Ah battery typically requires a charging current of around 10% of its capacity. In this case, 10% of 200Ah is 20A, so the charging current would be in the range of 20-22 A.

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  • 44. 

    The terminal potential difference of a cell of e.m.f. 2V and internal resistance 0.1Ω when supplying a current of 5A will be

    • A.

      1.5 V

    • B.

      2.5 V

    • C.

      3 V

    • D.

      1 V

    Correct Answer
    A. 1.5 V
    Explanation
    The terminal potential difference of a cell can be calculated using the formula V = E - Ir, where V is the terminal potential difference, E is the electromotive force (e.m.f.) of the cell, I is the current flowing through the cell, and r is the internal resistance of the cell. In this case, the e.m.f. is given as 2V, the current is 5A, and the internal resistance is 0.1Ω. Substituting these values into the formula, we get V = 2 - (5 * 0.1) = 2 - 0.5 = 1.5V. Therefore, the correct answer is 1.5V.

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  • 45. 

    Sensitivity in a capsule is increased _______ 

    • A.

      Through parallel connection of capsules

    • B.

      Through series connection of capsules

    • C.

      Through series and parallel connection of capsules

    • D.

      By not connecting them at all

    Correct Answer
    B. Through series connection of capsules
    Explanation
    When capsules are connected in series, the sensitivity of the capsule is increased. This is because when capsules are connected in series, the output voltage of each capsule adds up, resulting in a higher overall output voltage. This increase in output voltage indicates an increase in sensitivity, as the capsule can detect smaller changes in input signals. Connecting capsules in series allows for a cumulative effect, enhancing the overall sensitivity of the system.

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  • 46. 

    Which of the following is correct for tactile sensors?

    • A.

      Through parallel connection of capsules

    • B.

      Through series connection of capsules

    • C.

      Through series and parallel connection of capsules

    • D.

      By not connecting them at all

    Correct Answer
    B. Through series connection of capsules
    Explanation
    Tactile sensors are typically constructed using multiple capsules that detect pressure or touch. The correct answer states that tactile sensors work through series connection of capsules. This means that the capsules are connected in a series circuit, where the output of one capsule is connected to the input of the next capsule. This allows for the sensors to accurately detect and measure pressure or touch by combining the outputs of multiple capsules in a sequential manner.

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  • 47. 

     Smalest change which a sensor can detect is ____________

    • A.

      Resolution

    • B.

      Accuracy

    • C.

      Precision

    • D.

      Scale

    Correct Answer
    A. Resolution
    Explanation
    Resolution refers to the smallest change that a sensor can detect. It is a measure of the sensor's ability to distinguish between small differences in the quantity being measured. A higher resolution means that the sensor can detect smaller changes, while a lower resolution means that it can only detect larger changes. Accuracy, precision, and scale are not directly related to the smallest detectable change by a sensor.

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  • 48. 

    ____ is related to ergonomics

    • A.

      Comfort

    • B.

      Safety

    • C.

      Aesthetics

    • D.

      All the Above

    Correct Answer
    A. Comfort
    Explanation
    Comfort is related to ergonomics because ergonomics is the study of designing and arranging objects and environments in a way that optimizes human well-being and performance. Comfort is an essential aspect of ergonomics as it focuses on providing physical and psychological comfort to individuals while interacting with various products, systems, and environments. By prioritizing comfort in design, ergonomics aims to prevent discomfort, fatigue, and stress, ultimately enhancing productivity and overall satisfaction.

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  • 49. 

    Railway tracks are metallic for

    • A.

      Elongation

    • B.

      Conductivity

    • C.

      Friction

    • D.

      Strength

    Correct Answer
    A. Elongation
    Explanation
    Railway tracks are made of metal because of their elongation properties. Elongation refers to the ability of a material to stretch or expand under tension without breaking. Railway tracks need to withstand the weight of heavy trains and the forces exerted on them, such as temperature changes and vibrations. Metal tracks have high elongation, allowing them to absorb these forces without deforming or breaking. This ensures the safety and stability of the tracks, preventing accidents and derailments.

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  • 50. 

    What affect do petrol and diesel engines have on the environment?

    • A.

      They help deplete natural resources and contribute to increasing CO2 emissions

    • B.

      They help deplete natural resources and reduce CO2 emissions

    • C.

      They contribute to increasing CO2 emissions but help reduce global warming

    Correct Answer
    A. They help deplete natural resources and contribute to increasing CO2 emissions
    Explanation
    Petrol and diesel engines have a negative impact on the environment because they help deplete natural resources and contribute to increasing CO2 emissions. These engines rely on fossil fuels, which are non-renewable resources, and their combustion releases CO2 into the atmosphere. This contributes to the greenhouse effect and climate change. Therefore, the use of petrol and diesel engines is harmful to the environment.

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