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4

In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be

A. Increase key length

B. Increase key depth

C. Increase key width

D. Double all the dimensions

Correct Answer :

C. Increase key width


Related Questions

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A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called

A. Isothermal process

B. Hyperbolic process

C. Adiabatic process

D. Polytropic process

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4

When it is indicated that a member is elastic, it means that when force is applied, it will

A. Not deform

B. Be safest

C. Stretch

D. Not stretch

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4

The absolute zero pressure will be

A. When molecular momentum of the system becomes zero

B. At sea level

C. At the temperature of - 273 K

D. At the centre of the earth

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4

Young's modulus is defined as the ratio of

A. Volumetric stress and volumetric strain

B. Lateral stress and lateral strain

C. Longitudinal stress and longitudinal strain

D. Shear stress to shear strain

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The section modulus of a circular section about an axis through its C.G., is

A. πd²/4

B. πd²/16

C. πd3/16

D. πd3/32

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One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.

A. 8/3

B. 11/3

C. 11/7

D. 7/3

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4

A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as

A. Chain riveted joint

B. Diamond riveted joint

C. Crisscross riveted joint

D. Zigzag riveted joint

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4

Strain energy is the

A. Energy stored in a body when strained within elastic limits

B. Energy stored in a body when strained up to the breaking of a specimen

C. Maximum strain energy which can be stored in a body

D. Proof resilience per unit volume of a material

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The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

A. Enthalpy

B. Internal energy

C. Entropy

D. External energy

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4

Carbonisation of coal consists of

A. Drying and crushing the coal to a fine powder

B. Moulding the finely ground coal under pressure with or without a binding material

C. Heating the wood with a limited supply of air to temperature not less than 280°C

D. None of the above

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4

An adiabatic process is one in which

A. No heat enters or leaves the gas

B. The temperature of the gas changes

C. The change in internal energy is equal to the mechanical workdone

D. All of the above

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4

Which of the following is the correct statement of the second law of thermodynamics?

A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

B. It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.

C. There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.

D. All of the above

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The principal constituents of a fuel are

A. Carbon and hydrogen

B. Oxygen and hydrogen

C. Sulphur and oxygen

D. Sulphur and hydrogen

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4

A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is

A. T.ω watts

B. 2π. T.ω watts

C. 2π. T.ω/75 watts

D. 2π. T.ω/4500 watts

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4

The atomic mass of nitrogen is __________ oxygen.

A. Equal to

B. Less than

C. More than

D. None of these

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The safe twisting moment for a compound shaft is equal to the

A. Maximum calculated value

B. Minimum calculated value

C. Mean value

D. Extreme value

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When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as

A. Thermodynamic law

B. Thermodynamic process

C. Thermodynamic cycle

D. None of these

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4

Principal planes are planes having

A. Maximum shear stress

B. No shear stress

C. Minimum shear stress

D. None of the above

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A cylindrical section having no joint is known as

A. Joint less section

B. Homogeneous section

C. Perfect section

D. Seamless section

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For a simply supported beam of length l, when a concentrated load W is applied in the centre of the beam, the maximum deflection is

A. 5WL³/ 384EI

B. WL³/384EI

C. WL³/ 348EI

D. WL³/ 48EI

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4

Carnot cycle consists of

A. Two constant volume and two isentropic processes

B. Two isothermal and two isentropic processes

C. Two constant pressure and two isentropic processes

D. One constant volume, one constant pressure and two isentropic processes

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The calorific value of gaseous fuel is expressed in

A. kJ

B. kJ/kg

C. kJ/m2

D. kJ/m3

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The unit of energy is S. I. units is

A. Joule (J)

B. Joule metre (Jm)

C. Watt (W)

D. Joule/metre (J/m)

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Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.

A. 1/27th

B. 1/93th

C. 1/173th

D. 1/273th

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4

When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ε₁ = Hoop strain, and ε₂ = Longitudinal strain)

A. 2ε₁ - ε₂

B. 2ε₁ + ε₂

C. 2ε₂ - ε₁

D. 2ε₂ + ε₁

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The limit of eccentricity for no tensile conditions for a column of circular section of diameter (D) is

A. d/4

B. d/8

C. d/12

D. d/16

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The state of a substance whose evaporation from its liquid state is complete, is known as

A. Vapour

B. Perfect gas

C. Air

D. Steam

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Which of the following is correct?

A. Absolute pressure = Gauge pressure + Atmospheric pressure

B. Gauge pressure = Absolute pressure + Atmospheric pressure

C. Atmospheric pressure = Absolute pressure + Gauge pressure

D. Absolute pressure = Gauge pressure - Atmospheric pressure

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The absolute zero pressure can be attained at a temperature of

A. 0°C

B. 273°C

C. 273 K

D. None of these

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Which of the following is the extensive property of a thermodynamic system?

A. Pressure

B. Volume

C. Temperature

D. Density