All India Barc Online Test In Mechanical Engg.

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Kinamatic Viscosity is Given by
- Dynamic Viscosity/ Density
- Product of dynamic viscosity and density
- Density/dynamic viscosity
- Dynamic Viscosity /momentum

About This Quiz

This online test in Mechanical Engineering for the ALL INDIA BARC assesses knowledge on materials and processes like grinding, reaming, and milling. It evaluates understanding of technical specifications, tolerances, and mechanical tool operations, crucial for professionals in the field.

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2.

A Tank is initially empty after sometime Water from height h is falling into the tank with Volume flow rate is Q , the Velocity of the water when it hits the Tank surface is 2 m/s at any instant of time the mass of tank and Water is 250 Kg and Accelaration due to gravity is 10 m/sec^2 . Then Total force (N) resisted by the weighing balance at that instant of time is
- 2500 + 2000 Q
- 2000 + 2000 Q
- 2000 + 2500 Q
- 2500 + 2500 Q
Correct Answer

A. 2500 + 2000 Q

Explanation

The total force resisted by the weighing balance at that instant of time can be calculated using the equation F = mg, where F is the force, m is the mass, and g is the acceleration due to gravity. In this case, the mass of the tank and water is given as 250 kg. Therefore, the force is equal to 250 kg multiplied by 10 m/s^2 (acceleration due to gravity), which gives us 2500 N. Additionally, the velocity of the water when it hits the tank surface is given as 2 m/s. The force due to the water hitting the tank surface can be calculated using the equation F = mv, where m is the mass and v is the velocity. Therefore, the force due to the water hitting the tank surface is equal to 2000 Q N (Q is the volume flow rate). Therefore, the total force resisted by the weighing balance at that instant of time is 2500 + 2000 Q N.

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3.

A Gas Turbine Cycle with heat exchange and reheating improves
- Only the thermal efficiency
- Only the Specific power output
- Both thermal effiecincy and specific power output
- Any one of the above
Correct Answer

A. Both thermal effiecincy and specific power output

Explanation

A Gas Turbine Cycle with heat exchange and reheating improves both thermal efficiency and specific power output. Heat exchange helps in extracting more energy from the fuel, increasing the thermal efficiency of the cycle. Reheating allows for additional expansion of the working fluid, resulting in increased power output. Therefore, both the thermal efficiency and specific power output are improved in a Gas Turbine Cycle with heat exchange and reheating.

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4.

The main cutting force acting on a tool during the turning (orthogonal cutting) operation of a metal is 400 N. The turning was performed using 2 mm depth of cut and 0.1 mm/rev feed rate. The specific cutting pressure (in N/mm2) is
- 1000
- 2000
- 3000
- 4000
Correct Answer

A. 2000

Explanation

The specific cutting pressure can be calculated using the formula: Specific cutting pressure = Cutting force / (Depth of cut x Feed rate). In this case, the cutting force is given as 400 N, the depth of cut is 2 mm, and the feed rate is 0.1 mm/rev. Plugging in these values, we get: Specific cutting pressure = 400 N / (2 mm x 0.1 mm/rev) = 400 N / (0.2 mm/rev) = 2000 N/mm2. Therefore, the specific cutting pressure is 2000 N/mm2.

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5.

A pair of spur gears with module 5 mm and a center distance of 450 mm is used for a speed reduction of 5:1. The number of teeth on pinion is
- 30
- 50
- 60
- 20
Correct Answer

A. 30

Explanation

The module of the gears is given as 5 mm, which represents the size of the gear teeth. The center distance between the gears is given as 450 mm. The speed reduction ratio is 5:1, which means the pinion gear (smaller gear) will have 5 times fewer teeth than the larger gear. Therefore, the number of teeth on the pinion gear can be calculated as (number of teeth on larger gear) divided by 5. Since the answer options are 30, 50, 60, and 20, the only option that satisfies this calculation is 30.

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6.

Ratio between inertial forces and the square root of pressure forces is known as
- Euler number
- Weber number
- Froude number
- Mach number
Correct Answer

A. Euler number

Explanation

The ratio between inertial forces and the square root of pressure forces is known as the Euler number. It is a dimensionless number used in fluid dynamics to determine the relative importance of inertial forces compared to pressure forces. The Euler number is commonly used in the study of fluid flow and is named after Swiss mathematician Leonhard Euler.

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7.

In powder metallurgy, the operation carried out to improve the bearing property of a bush is called
- Infilteration
- Impregnation
- Plating
- Sintering
Correct Answer

A. Impregnation

Explanation

Impregnation is the operation carried out in powder metallurgy to improve the bearing property of a bush. Impregnation involves filling the pores of the bush with a lubricant or a solid material to enhance its bearing capacity. This process helps to reduce friction and wear, ensuring smoother operation and longer lifespan of the bush. Infiltration, plating, and sintering are also important operations in powder metallurgy, but they are not specifically aimed at improving the bearing property of a bush.

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8.

In Certain type of Heat Exchanger , Both the fluids have identical mass flow rate Specific heat product. The hot fluid enters at 349 K and leaves at 322 K and the cold fluid entering at 301 K leave at 328 K. The effectiveness of HE IS
- 0.7
- 0.6
- 0.2
- 0.3
Correct Answer

A. 0.6

Explanation

The effectiveness of a heat exchanger is a measure of how well it transfers heat from one fluid to another. In this case, both fluids have identical mass flow rate Specific heat product, which means they have the same ability to absorb and release heat. The hot fluid enters at a higher temperature and leaves at a lower temperature, while the cold fluid enters at a lower temperature and leaves at a higher temperature. The effectiveness of 0.6 indicates that the heat exchanger is able to transfer 60% of the available heat from the hot fluid to the cold fluid.

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9.

Line imperfection in a crystal is called
- Schottky defect
- Frenkel defect
- Edge dislocation
- Miller defect
Correct Answer

A. Edge dislocation

Explanation

An edge dislocation refers to a line imperfection in a crystal lattice where there is an extra or missing half-plane of atoms. This type of defect causes a distortion in the crystal structure along the line, resulting in localized strain and deformation. Edge dislocations can have significant effects on the mechanical properties of materials, such as increasing their strength and hardness.

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10.

Wheel loading in grinding is defined as
- Types of wheel bond fracture
- Types of wheel grain fracture
- Sticking of small particle on grinding wheel
- None of the above
Correct Answer

A. Sticking of small particle on grinding wheel

Explanation

Wheel loading in grinding is defined as the sticking of small particles on the grinding wheel. During the grinding process, the small particles from the workpiece or the grinding wheel itself can adhere to the surface of the wheel, reducing its cutting ability and causing a decrease in the material removal rate. This phenomenon can lead to poor surface finish, increased heat generation, and shorter wheel life. Therefore, it is important to prevent wheel loading by using appropriate coolant, dressing the wheel regularly, and maintaining proper grinding parameters.

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11.

The stress acting on a element in X and Y direction is 40 MPa and 30 Mpa. Then the Average of maximium and minimium Principle Stress is
- 35
- 45
- 50
- 55
Correct Answer

A. 35

Explanation

The average of the maximum and minimum principle stress can be calculated by adding the maximum and minimum principle stress values and dividing the sum by 2. In this case, the maximum principle stress is 40 MPa and the minimum principle stress is 30 MPa. Therefore, the average of the maximum and minimum principle stress is (40 + 30) / 2 = 35 MPa.

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12.

The jobs arrive at a facility, for service, in a random manner. The probability distribution of number of arrivals of jobs in a fixed time interval is
- Normal
- Poisson
- Erlang
- Beta
Correct Answer

A. Poisson

Explanation

The Poisson distribution is commonly used to model the number of arrivals of events in a fixed time interval, where the events occur randomly and independently of each other. It is often used in scenarios such as the arrival of customers at a service facility or the occurrence of accidents in a given time period. Therefore, the given probability distribution of the number of arrivals of jobs in a fixed time interval being Poisson is a reasonable and appropriate choice.

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13.

The enthalpy of steam at the inlet and outlet of a steam turbine is 2850 KJ/Kg and 1950 KJ/Kg respectively. The specifiec steam consumption in Kg/KW hour is
- 4
- 3
- 5
- 2
Correct Answer

A. 4
14.

The process of producing components in moulds without the application of pressure, is known as
- Moulding
- Laminating
- Casting
- Calendering
Correct Answer

A. Casting

Explanation

Casting is the correct answer because it refers to the process of producing components in moulds without the application of pressure. In casting, a molten material, such as metal or plastic, is poured into a mould and allowed to solidify, forming the desired shape. This process is commonly used in manufacturing industries to create complex and intricate parts with high accuracy and precision. Casting is different from other options like moulding, laminating, and calendering, which involve the application of pressure or other techniques to shape materials.

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15.

A Lead Screw with half nuts in a lathe, Free to Rotate in both Direction has
- V-threads
- Whithworth threads
- Buttress threads
- ACME threads
Correct Answer

A. ACME threads

Explanation

ACME threads are the correct answer because they are commonly used in lead screws with half nuts in a lathe. ACME threads have a trapezoidal shape which provides better load-carrying capacity and resistance to wear compared to other thread types. They are designed to allow for smooth and efficient movement in both directions of rotation. V-threads, Whithworth threads, and Buttress threads are not typically used in this specific application.

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16.

A milling cutter having 8 teeth is rotating at 150 rpm. if the feed per tooth is 0.1 mm, the value of thew table speed in mm/min is
- 120
- 187
- 125
- 70
Correct Answer

A. 120

Explanation

The table speed is calculated by multiplying the feed per tooth by the number of teeth on the milling cutter and the rotational speed. In this case, the feed per tooth is 0.1 mm, the number of teeth is 8, and the rotational speed is 150 rpm. Multiplying these values together gives a table speed of 120 mm/min.

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17.

The damping ratio of a single degree of freedom spring-mass-damper system with mass of 1 kg, stiffness 100 N/m and viscous damping coefficient of 25 Ns/m is
- 1.25
- 1.8
- 1.7
- 1.9
Correct Answer

A. 1.25

Explanation

The damping ratio of a single degree of freedom spring-mass-damper system can be calculated using the formula: damping ratio = damping coefficient / (2 * sqrt(mass * stiffness)). In this case, the damping coefficient is given as 25 Ns/m, the mass is 1 kg, and the stiffness is 100 N/m. Plugging these values into the formula, we get damping ratio = 25 / (2 * sqrt(1 * 100)) = 25 / (2 * 10) = 1.25.

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18.

If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
- Higher than surface of liquid
- Same as the surface of liquid
- Lower than the surface of liquid
- Unpredictable
Correct Answer

A. Lower than the surface of liquid

Explanation

When the cohesion between molecules of a fluid is greater than the adhesion between the fluid and the glass, the molecules of the fluid tend to stick together more strongly than they stick to the glass. This results in a concave meniscus forming in the dipped glass tube, causing the free level of the fluid to be lower than the surface of the liquid.

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19.

According to kinectic theory of gases, at absolute zero
- Specific heat of molecules reduced to zero
- Kinectic energy of molecules reduced to zero
- Volume of gas reduce to zero
- Pressure of gas reduced to zero
Correct Answer

A. Kinectic energy of molecules reduced to zero

Explanation

According to the kinetic theory of gases, at absolute zero, the kinetic energy of molecules is reduced to zero. This is because at absolute zero, the temperature of the gas is at its lowest possible value, causing the molecules to have minimal or no motion. As kinetic energy is directly related to the motion of particles, when the motion ceases, the kinetic energy also becomes zero.

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20.

A Carnot cycle is having of 0.75. if the temperature of the high temperature reservior is 1000 K. What is the temperature of low temperature reservior
- 250 K
- 300 K
- 350 K
- 400 K
Correct Answer

A. 250 K

Explanation

The Carnot cycle is a theoretical thermodynamic cycle that operates between two temperature reservoirs. The efficiency of the Carnot cycle is given by the formula efficiency = 1 - (T_low / T_high), where T_low and T_high are the temperatures of the low and high temperature reservoirs, respectively. In this case, the efficiency is given as 0.75. Substituting the given values into the formula, we can solve for T_low: 0.75 = 1 - (T_low / 1000). Rearranging the equation gives T_low = (1 - 0.75) * 1000 = 250 K. Therefore, the temperature of the low temperature reservoir is 250 K.

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21.

The Transmissibility of dampfree vibration system whose Magnification Factor is 0.03
- 0.06
- 0.03
- 0.09
- 0.01
Correct Answer

A. 0.03

Explanation

The transmissibility of a dampfree vibration system is a measure of how much the vibration is transmitted from the input to the output. The magnification factor represents the ratio of the output amplitude to the input amplitude. In this case, the magnification factor is 0.03, which means that the output amplitude is 0.03 times the input amplitude. Therefore, the transmissibility of the system is also 0.03.

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22.

A Circular rod of length ‘L’ and area of cross-section ‘A’ has a modulus of elasticity ‘E’ and coefficient of thermal expansion ‘α’. One end of the rod is fixed and other end is free. If the temperature of the rod is increased by ΔT, then
- Stress developed in the rod is E α ΔT and strain developed in the rod is α ΔT
- Both stress and strain developed in the rod are zero
- Stress developed in the rod is zero and strain developed in the rod is α ΔT
- Stress developed in the rod is E α ΔT and strain developed in the rod is zero
Correct Answer

A. Stress developed in the rod is zero and strain developed in the rod is α ΔT

Explanation

When one end of the rod is fixed and the other end is free, the rod is unable to expand or contract freely in response to the change in temperature. This results in the development of stress in the rod, which is equal to zero. However, the coefficient of thermal expansion α indicates that the rod will experience a change in length proportional to the change in temperature. This change in length corresponds to the strain developed in the rod, which is α ΔT. Therefore, the stress developed in the rod is zero and the strain developed is α ΔT.

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23.

An aluminium alloy (density 2600 kg/m^3) casting is to be produced. A cylindrical hole of 100 mm diameter and 100 mm length is made in the casting using sand core (density 1600 kg/m^3). The net buoyancy force (in newton) acting on the core is
- 5
- 8
- 9
- 4
Correct Answer

A. 8

Explanation

The net buoyancy force acting on the core can be calculated by finding the difference between the weight of the displaced fluid and the weight of the core. The weight of the displaced fluid can be calculated using the formula: weight = density * volume * gravity. The volume of the displaced fluid can be calculated as the volume of the cylindrical hole. The weight of the core can be calculated using the formula: weight = density * volume * gravity. By subtracting the weight of the core from the weight of the displaced fluid, we can find the net buoyancy force. In this case, the weight of the displaced fluid is greater than the weight of the core, resulting in a net buoyancy force of 8 newtons.

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24.

Cold shortness is defined as the
- Fracture in room temperature below their recrystallization temperature
- Brittelness in room temperature below their recrystallization temperature
- Loss of ductility above recrystallization temperature
- Decrease of brittleness in room temperature
Correct Answer

A. Brittelness in room temperature below their recrystallization temperature

Explanation

Cold shortness refers to the brittleness of a material at room temperature when it is below its recrystallization temperature. This means that the material becomes more prone to fracturing or breaking when it is subjected to stress or impact at lower temperatures. The loss of ductility occurs above the recrystallization temperature, not below it. Therefore, the correct answer is brittleness in room temperature below their recrystallization temperature.

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25.

A Pipe carrying hot fluid and it is desired to reduceing the heat loss. If the two insulating material of Thermal Conductivity 2 K and 4 K are available for lagging a pipe and the radial thickness of each material is same. Then
- Higher thermal conductivity material should be used for inner layer and low thermal conductivity material should be used for outer layer
- Higher thermal conductivity material should be used for outer layer and low thermal conductivity material should be used for inner layer
- Selection of material for any layer is independent on thermal conductivity
- Can't judge due to insufficient data
Correct Answer

A. Higher thermal conductivity material should be used for outer layer and low thermal conductivity material should be used for inner layer

Explanation

The higher thermal conductivity material should be used for the outer layer and the lower thermal conductivity material should be used for the inner layer. This is because the outer layer of the insulation will be exposed to the surrounding environment, which is typically at a lower temperature. Using a material with higher thermal conductivity for the outer layer will allow for better heat transfer from the pipe to the surroundings, reducing heat loss. The inner layer, on the other hand, will be in direct contact with the hot fluid inside the pipe. Using a material with lower thermal conductivity for the inner layer will help to minimize heat transfer from the fluid to the surroundings, further reducing heat loss.

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26.

If a function is continuous at a point,
- The limit of the function may not exist at the point
- The function must be derivable at the point
- The limit of the function at the point tends to infinity
- The limit must exist at the point and the value of limit should be same as the value of the
Correct Answer

A. The limit must exist at the point and the value of limit should be same as the value of the

Explanation

The correct answer is "the limit must exist at the point and the value of the limit should be the same as the value of the function at that point." This is because continuity at a point requires that the function approaches a specific value as the input approaches that point. In other words, the limit of the function as the input approaches the point must exist and be equal to the value of the function at that point.

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27.

Modulus of section of hollow tube of outer diameter 2d and innner diameter is d
- 3πd3/64
- 7πd3/64
- 15πd3/64
- 3πd3/8
Correct Answer

A. 15πd3/64

Explanation

The formula for the modulus of a section of a hollow tube is (π/32) * (D^4 - d^4), where D is the outer diameter and d is the inner diameter of the tube. In this case, the outer diameter is 2d and the inner diameter is d. Plugging these values into the formula, we get (π/32) * ((2d)^4 - d^4) = (π/32) * (16d^4 - d^4) = (π/32) * 15d^4 = 15πd^4/32. Simplifying further, we get 15πd^3/64, which matches the given answer.

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28.

Among the conventional, machining process maximium specifiec energy is consumed in
- Grinding
- Drilling
- Planing
- Turnig
Correct Answer

A. Grinding

Explanation

Grinding consumes the maximum specific energy among the conventional machining processes. This is because grinding involves the use of abrasive particles to remove material from the workpiece surface, resulting in high friction and heat generation. The abrasive particles continuously rub against the workpiece, requiring a significant amount of energy to break the bonds between the material and remove it. In comparison, drilling, planing, and turning involve cutting or shaping the material, which typically requires less energy as compared to the grinding process.

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29.

Cutting tool is much harder than the workpiece. Yet the tool wears out during the tool-work interaction, because
- Extra hardness is imparted to the workpiece due to coolant used
- Extra hardness is imparted to the workpiece due to coolant used
- Extra hardness is imparted to the workpiece due to severe rate of strain
- Vibration is induced in the machine tool
Correct Answer

A. Extra hardness is imparted to the workpiece due to severe rate of strain

Explanation

During the tool-work interaction, the workpiece experiences a severe rate of strain. This causes the workpiece to become harder, resulting in extra hardness being imparted to it. As a result, the cutting tool wears out because it is constantly in contact with a harder surface, leading to abrasion and wear.

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30.

In the griding wheel have specification A60G7B23, B stands for the
- Resinoid bond
- Rubber bond
- Shellac bond
- Silicate bond
Correct Answer

A. Resinoid bond

Explanation

The correct answer is resinoid bond. In the given specification A60G7B23, the letter B stands for the resinoid bond. Resinoid bonds are made from synthetic resins and are commonly used in grinding wheels for their excellent cutting ability and durability. They are able to withstand high temperatures and are resistant to water and oil, making them suitable for various grinding applications.

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31.

A Grinding wheel of 150mm diameter is rotating at 3000 rpm. The grinding speed is
- 7.5 π m/s
- 15π m/s
- 45π m/s
- 450π m/s
Correct Answer

A. 7.5 π m/s

Explanation

The grinding speed can be calculated by multiplying the circumference of the grinding wheel with the rotational speed. The circumference of the grinding wheel can be found using the formula 2πr, where r is the radius of the wheel. Since the diameter of the wheel is given as 150mm, the radius can be calculated as 150/2 = 75mm = 0.075m. Therefore, the circumference is 2π(0.075) = 0.15πm. Multiplying this by the rotational speed of 3000 rpm gives us 0.15π * 3000 = 450π m/s.

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32.

The correct sequence of the given materials in descending order of their weldability is
- Mild steel, Copper, Cast Iron, Al
- Cast iron, Al, Mild steel, Copper
- Copper, Cast iron, Mild steel, Al
- Al, Cast iron, Copper, Mild steel
Correct Answer

A. Mild steel, Copper, Cast Iron, Al

Explanation

The correct sequence of the given materials in descending order of their weldability is mild steel, copper, cast iron, and aluminum. Weldability refers to the ease with which a material can be welded. Mild steel is known for its excellent weldability due to its low carbon content and the absence of other alloying elements. Copper also has good weldability as it has a high thermal conductivity and low melting point. Cast iron has lower weldability compared to mild steel and copper due to its high carbon content and brittleness. Aluminum has the lowest weldability among the given materials due to its high thermal conductivity and oxide layer formation during welding.

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33.

The two principle stresses are equal in Magnitude and Direction and is Equal to 100 Mpa. Then the Permissible Yield Stress (MPa) in Simple Tension According to Distortion Energy Theory is
- 200 MPa
- 100 MPa
- 150 MPa
- 90 Mpa
Correct Answer

A. 100 MPa

Explanation

According to the Distortion Energy Theory, the permissible yield stress in simple tension is equal to the magnitude of the two principal stresses divided by the factor of safety. Since the two principal stresses are equal in magnitude and direction and equal to 100 MPa, the permissible yield stress would be 100 MPa.

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34.

When the column is fixed at both ends, corresponding Euler critical load is
- π2 E I/L2
- 2π2 E I/L2
- 3π2 E I/L2
- 4π2 E I/L2
Correct Answer

A. 4π2 E I/L2

Explanation

The correct answer is 4π2 E I/L2. When a column is fixed at both ends, the corresponding Euler critical load can be calculated using the formula 4π2 E I/L2. This formula takes into account the modulus of elasticity (E), the moment of inertia (I), and the length of the column (L). By plugging in the appropriate values, the critical load can be determined.

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35.

Which one of the following materials is used as the bonding material for grinding wheels
- Silicon carbide
- Sodium silicate
- Boron carbide
- Aluminium oxide
Correct Answer

A. Sodium silicate

Explanation

Sodium silicate is used as the bonding material for grinding wheels. It is a versatile material that can be used in both organic and inorganic bonding systems. Sodium silicate has excellent adhesive properties and can form strong bonds between abrasive grains and the wheel structure. It also has good heat resistance, which is important for grinding applications where high temperatures are generated. Additionally, sodium silicate is cost-effective and readily available, making it a popular choice for bonding grinding wheels.

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36.

Gas having index of expansion is 2 flows through convergent nozzle the Critical pressure ratio is
- 0.66 bar
- 0.44 bar
- 0.1975 bar
- 0.81 bar
Correct Answer

A. 0.44 bar

Explanation

The critical pressure ratio for a gas flowing through a convergent nozzle can be calculated using the equation P2/P1 = (2/(gamma+1))^(gamma/(gamma-1)), where P2 is the outlet pressure and P1 is the inlet pressure, and gamma is the index of expansion. In this case, the index of expansion is given as 2. Plugging in the values, we can solve for the critical pressure ratio. The correct answer is 0.44 bar.

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37.

A gymnastic beam can be modeled with a 10 cm x 40 cm crosssection and 6 m between its supports. A gymnast lands at the center of this beam with a 1.5 kN force. What is the shear stress on the upper surface of the beam directly below the force of the gymnast?
- 0 Kpa
- 31 Kpa
- 18 Kpa
- 40 Kpa
Correct Answer

A. 0 Kpa

Explanation

The shear stress on the upper surface of the beam directly below the force of the gymnast is 0 Kpa. This is because shear stress is calculated by dividing the force applied perpendicular to the area by the area itself. In this case, the force applied is 1.5 kN and the area is 10 cm x 40 cm. However, since the gymnast lands at the center of the beam, the force is evenly distributed on both sides, resulting in an equal and opposite force canceling each other out. Therefore, the net force is 0, leading to a shear stress of 0 Kpa.

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38.

At the triple point of Water, the Number of Degrees of Freedom is
- 1
- 2
- 3
Correct Answer

A. 1

Explanation

At the triple point of water, the number of degrees of freedom is 1. This is because at this point, water exists in a unique state where all three phases (solid, liquid, and gas) can coexist in equilibrium. The temperature and pressure are fixed, leaving no freedom for any variation in these parameters. Therefore, there is only one degree of freedom remaining, which is the composition of the three phases.

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39.

For laminar forced convection over a flat plate, if the free stream velocity increases by a factor of 2, the average heat transfer coefficient
- Remains same
- Decreases by a factor of 1.414
- Rise by a factor of 1.414
- Increase by a factor of 4
Correct Answer

A. Rise by a factor of 1.414

Explanation

When the free stream velocity increases by a factor of 2, the average heat transfer coefficient rises by a factor of 1.414. This is because the heat transfer coefficient is directly proportional to the velocity of the fluid. As the velocity increases, the fluid carries more heat away from the surface, resulting in a higher heat transfer coefficient. The factor of 1.414 is derived from the relationship between velocity and heat transfer coefficient in laminar forced convection over a flat plate.

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40.

In a unit cell of a body centered cubic space lattice the total number of atoms is
- 6
- 9
- 14
- 24
Correct Answer

A. 9

Explanation

In a body-centered cubic (BCC) space lattice, there is one atom at each corner of the cube and one atom at the center of the cube. This gives a total of 8 atoms at the corners and 1 atom at the center, resulting in a total of 9 atoms in the unit cell.

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41.

In Which of the following process the total heat is converted into work
- Reversible Adiabatic Process
- Reversible Isothermal Process
- Reversible Isochoric Process
- Reversible Isoboric Process
Correct Answer

A. Reversible Isothermal Process

Explanation

In a reversible isothermal process, the total heat is converted into work. This is because in an isothermal process, the temperature remains constant. As a result, the system absorbs heat from the surroundings and converts it into work without any change in temperature. This process is reversible, meaning that it can be reversed to its initial state without any loss or gain of energy. Therefore, the total heat is completely converted into work in a reversible isothermal process.

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42.

For a completely submerged body with centre of gravity ‘G’ and centre of buoyancy ‘B’, the condition of stability will be
- G is located below B
- G located above B
- G and B in Coincident
- Independent of the location of G and B
Correct Answer

A. G is located below B

Explanation

When the center of gravity (G) is located below the center of buoyancy (B) for a completely submerged body, the body will be stable. This is because the buoyant force acting on the body will create a torque that tends to restore the body to its original position if it is displaced. The lower the center of gravity is compared to the center of buoyancy, the greater the stability of the body.

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43.

A body of mass 10 kg moving with the velocity of 1 m/s is acted upon by a force of 50 N for two Seconds. The final velocity will be
- 22 m/s
- 10 m/s
- 21 m/s
- 11 m/s
Correct Answer

A. 11 m/s

Explanation

When a force is applied to an object, it causes a change in its velocity. According to Newton's second law of motion, force (F) is equal to mass (m) multiplied by acceleration (a). In this case, the force applied is 50 N and the mass of the body is 10 kg. Therefore, the acceleration can be calculated as 50 N / 10 kg = 5 m/s^2.

Using the equation of motion v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time, we can substitute the given values. The initial velocity (u) is 1 m/s, the acceleration (a) is 5 m/s^2, and the time (t) is 2 seconds.

Plugging in these values, we get v = 1 m/s + 5 m/s^2 * 2 s = 11 m/s. Therefore, the final velocity of the body will be 11 m/s.

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2
44.

The bottles from thermo plastic materials are made by
- Compression moulding
- Extrusion with mandrel
- Injection moulding
- blow moulding
Correct Answer

A. blow moulding

Explanation

Blow moulding is the correct answer because it is the process used to make bottles from thermo plastic materials. In blow moulding, a hollow tube called a parison is formed by extrusion or injection moulding. The parison is then placed in a mould and inflated with air, taking the shape of the mould to form the bottle. This process is commonly used for manufacturing plastic bottles as it allows for high production rates and the ability to create bottles with complex shapes and sizes.

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45.

The hot tearing in a metal casting due to
- High fluidity
- High melt temperature
- Wide range of solidification temperature
- Low coefficient of thermal expansion
Correct Answer

A. Wide range of solidification temperature

Explanation

Hot tearing in a metal casting can occur when there is a wide range of solidification temperature. This means that different sections of the casting solidify at different rates, causing internal stresses to build up. These stresses can lead to cracks or fractures in the casting, known as hot tears. Factors such as high fluidity, high melt temperature, and low coefficient of thermal expansion may affect the overall casting process, but they do not directly contribute to hot tearing.

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46.

Constant Pressure lines in the superheated region of the Mollier Diagram will have
- A positive slope
- A negative slope
- Zero slope
- Asymptote
Correct Answer

A. A positive slope

Explanation

Constant pressure lines in the superheated region of the Mollier Diagram will have a positive slope because as the temperature increases, the enthalpy also increases at a constant pressure. This is because the superheated region represents the state of steam that is above its saturation temperature and pressure, and as heat is added to the steam, its temperature and enthalpy increase. Therefore, the constant pressure lines on the Mollier Diagram will have a positive slope to represent this relationship between temperature and enthalpy.

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47.

A group consists of equal number of men and women. Of this group 20% of the men and 50% of the women are unemployed. If a person is selected at random from this group, the probability of the selected person being employed is
- 0.65
- 0.3
- 0.4
- 0.8
Correct Answer

A. 0.65

Explanation

In the given group, 20% of the men and 50% of the women are unemployed. This means that 80% of the men and 50% of the women are employed. Since the group consists of an equal number of men and women, the probability of selecting an employed person from the group is the average of these two probabilities, which is (80% + 50%) / 2 = 65%. Therefore, the probability of the selected person being employed is 0.65.

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48.

Which one of the following instruments is widely used to check and calibrate geometric features of machine tools during their assembly?
- Ultrasonic Probe
- Vernier calipers
- Coordinate measuring machine
- Laser interferometer
Correct Answer

A. Coordinate measuring machine

Explanation

A coordinate measuring machine (CMM) is widely used to check and calibrate geometric features of machine tools during their assembly. CMMs are able to measure the dimensions, angles, and positions of various components with high accuracy. They use a probe to touch specific points on the machine tool and record the coordinates of these points. This data is then used to verify if the machine tool meets the required specifications and to make any necessary adjustments or calibrations. CMMs are commonly used in industries such as automotive, aerospace, and manufacturing for quality control and ensuring precision in the assembly process.

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1
49.

In a structure subjected to fatigue loading, the minimum and maximum stresses developed in a cycle are 200 MPa and 400 MPa respectively. The value of stress amplitude (in MPa) is
- 100
- 150
- 200
- 300
Correct Answer

A. 100

Explanation

The stress amplitude is calculated by taking the difference between the maximum and minimum stresses in a cycle. In this case, the maximum stress is 400 MPa and the minimum stress is 200 MPa. Therefore, the stress amplitude is 400 MPa - 200 MPa = 200 MPa.

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Current Version
Mar 21, 2023

Quiz Edited by
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Feb 28, 2015

Quiz Created by
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