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4

A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

A. Reversible cycle

B. Irreversible cycle

C. Thermodynamic cycle

D. None of these

Correct Answer :

C. Thermodynamic cycle


Related Questions

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4

The efficiency of Carnot cycle depends upon

A. Temperature limits

B. Pressure ratio

C. Volume compression ratio

D. Cut-off ratio and compression ratio

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4

When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the maximum normal stress i

A. (σx/2) + (1/2) × √(σx² + 4 τ²xy)

B. (σx/2) - (1/2) × √(σx² + 4 τ²xy)

C. (σx/2) + (1/2) × √(σx² - 4 τ²xy)

D. (1/2) × √(σx² + 4 τ²xy)

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4

A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called

A. Isothermal process

B. Hyperbolic process

C. Adiabatic process

D. Polytropic process

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4

When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the maximum shear stress is

A. x/2) + (1/2) × √(σx² + 4 τ²xy)

B. x/2) - (1/2) × √(σx² + 4 τ²xy)

C. x/2) + (1/2) × √(σx² - 4 τ²xy)

D. (1/2) × √(σx² + 4 τ²xy)

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4

A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

A. 30 kJ

B. 54 kJ

C. 84 kJ

D. 114 kJ

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4

The __________ is obtained when carbonisation of coal is carried out at 500° to 700° C.

A. Soft coal

B. Hard coal

C. Pulverised coal

D. Bituminous coal

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4

One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to

A. 800 K

B. 1000 K

C. 1200 K

D. 1400 K

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4

The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

A. Increase

B. Decrease

C. Remain unchanged

D. Increase/decrease depending on application

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4

The property of a material by virtue of which a body returns to its original, shape after removal of the load is called

A. Plasticity

B. Elasticity

C. Ductility

D. Malleability

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4

When a gas is heated, change takes place in

A. Pressure

B. Volume

C. Temperature

D. All of these

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4

In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.

A. Equal to

B. Less than

C. More than

D. None of these

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4

Impact strength of a material is an index of its

A. Toughness

B. Tensile strength

C. Capability of being cold worked

D. Hardness

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4

Efficiency of a riveted joint is the ratio of its strength (max. load it can resist without failure) to the strength of the un-punched plate in

A. Tension

B. Compression

C. Bearing

D. Any one of the above

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4

The point of contraflexure is a point where

A. Shear force changes sign

B. Bending moment changes sign

C. Shear force is maximum

D. Bending moment is maximum

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4

The general law for the expansion or compression of gases, is

A. pv = C

B. pv = m R T

C. pvn = C

D. pvγ = C

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4

The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is __________ at the fixed end.

A. wl/4

B. wl/2

C. wl

D. wl²/2

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4

A concentrated load is one which

A. Acts at a point on a beam

B. Spreads non-uniformly over the whole length of a beam

C. Spreads uniformly over the whole length of a beam

D. Varies uniformly over the whole length of a beam

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4

In compression test, the fracture in cast iron specimen would occur along

A. The axis of load

B. An oblique plane

C. At right angles to the axis of specimen

D. Would not occur

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4

A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum shear stress will be

A. -100 MPa

B. 250 MPa

C. 300 MPa

D. 400 MPa

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4

The bending equation is

A. M/I = σ/y = E/R

B. T/J = τ/R = Cθ/l

C. M/R = T/J = Cθ/l

D. T/l= τ/J = R/Cθ

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4

In the below figure, the plastic range occurs

A. Before point A

B. Beyond point A

C. Between points A and D

D. Between points D and E

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4

The change of entropy, when heat is absorbed by the gas, is

A. Positive

B. Negative

C. Positive or negative

D. None of these

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4

The intensity of stress which causes unit strain is called

A. Unit mass

B. Modulus of rigidity

C. Bulk modulus

D. Modulus of Elasticity

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4

The materials which exhibit the same elastic properties in all directions are called

A. Homogeneous

B. Inelastic

C. Isotropic

D. Isentropic

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4

One kg of carbon monoxide requires _______kg of oxygen to produce 11/7 kg of carbon dioxide gas.

A. 11/7

B. 9/7

C. 4/7

D. All of the above

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4

When a body is subjected to a direct tensile stress (σ) in one plane, then maximum normal stress occurs at a section inclined at __________ to the normal of the section.

A.

B. 30°

C. 45°

D. 90°

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4

The gas turbine cycle with regenerator improves

A. Thermal efficiency

B. Work ratio

C. Avoids pollution

D. None of these

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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 tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and σt = Allowable tensile stress for weld metal)

A. 0.5 s.l.σt

B. s.l.σt

C. √2 s.l.σt

D. 2.s.l.σt

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4

The most probable velocity of the gas molecules is given by

A. √(KT/m)

B. √(2KT/m)

C. √(3KT/m)

D. √(5KT/m)