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4

In a reversible adiabatic process, the ratio of T1/T2 is equal to

A. (p2/p1)γ - 1/ γ

B. (p1/p2)γ - 1/ γ

C. (v2/v1)γ - 1/ γ

D. (v1/v2)γ - 1/ γ

Correct Answer :

B. (p1/p2)γ - 1/ γ


Related Questions

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4

The lower layer of the beam as shown in the below figure, will be

A. In tension

B. In compression

C. Neither in tension nor in compression

D. None of these

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4

The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

A. Workdone

B. Entropy

C. Enthalpy

D. None of these

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4

A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to

A. wl/6

B. wl/3

C. wl

D. 2wl/3

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4

A key is subjected to side pressure as well at shearing forces. These pressures are called

A. Bearing stresses

B. Fatigue stresses

C. Crushing stresses

D. Resultant stresses

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4

The efficiency of Diesel cycle approaches to Otto cycle efficiency when

A. Cut-off is increased

B. Cut-off is decreased

C. Cut-off is zero

D. Cut-off is constant

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4

Which of the following statement is correct?

A. The heat and work are boundary phenomena

B. The heat and work represent the energy crossing the boundary of the system

C. The heat and work are path functions

D. All of the above

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4

Second law of thermodynamics defines

A. Heat

B. Work

C. Internal energy

D. Entropy

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4

A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

A. Isothermal process

B. Hyperbolic process

C. Adiabatic process

D. Polytropic process

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4

A cube subjected to three mutually perpendicular stress of equal intensity p expenses a volumetric strain

A. 3p/E × (2/m - 1)

B. 3p/E × (2 - m)

C. 3p/E × (1 - 2/m)

D. E/3p × (2/m - 1)

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4

The materials having same elastic properties in all directions are called

A. Ideal materials

B. Uniform materials

C. Isotropic materials

D. Piratical materials

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4

The efficiency of a gas turbine is given by

A. (Net work output)/(Workdone by the turbine)

B. (Net work output)/(Heat supplied)

C. (Actual temperature drop)/(Isentropic temperature drop)

D. (Isentropic increase in temperature)/(Actual increase in temperature)

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4

The variables which control the physical properties of a perfect gas are

A. Pressure exerted by the gas

B. Volume occupied by the gas

C. Temperature of the gas

D. All of these

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4

The shear force at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre, is

A. Zero

B. wl/4

C. wl/2

D. wl²/2

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4

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

The fuel mostly used in steam boilers is

A. Brown coal

B. Peat

C. Coking bituminous coal

D. Non-coking bituminous coal

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4

The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).

A. Less than

B. Equal to

C. More than

D. None of these

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4

In open cycle gas turbine plants

A. The indirect heat exchanger and cooler is avoided

B. Direct combustion system is used

C. A condenser is used

D. All of the above

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4

According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.

A. Remains constant

B. Increases

C. Decreases

D. None of these

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4

Steam coal is a

A. Pulverised coal

B. Brown coal

C. Coking bituminous coal

D. Non-coking bituminous coal

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4

Coke is produced

A. When coal is first dried and then crushed to a fine powder by pulverising machine

B. From the finely ground coal by moulding under pressure with or without a binding material

C. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

D. By heating wood with a limited supply of air to a temperature not less than 280°C

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4

Resilience of a material is considered when it is subjected to

A. Frequent heat treatment

B. Fatigue

C. Creep

D. Shock loading

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4

Which of the following is the correct statement?

A. For a given compression ratio, both Otto and Diesel cycles have the same efficiency.

B. For a given compression ratio, Otto cycle is more efficient than Diesel cycle.

C. For a given compression ratio, Diesel cycle is more efficient than Otto cycle.

D. The efficiency of Otto or Diesel cycle has nothing to do with compression ratio.

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4

Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m.

A. The shaft 'B' has the greater diameter

B. The shaft 'A' has the greater diameter

C. Both are of same diameter

D. None of these

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4

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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4

In the below figure, curve D represents_________.

A. Mild steel

B. Cast iron

C. Concrete

D. Bone 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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4

The specific heat of water is

A. 1.817

B. 2512

C. 4.187

D. None of these

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4

The thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.

A. Equal to

B. More than

C. Less than

D. None of these

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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 Joule (J) is equal to

A. 1 N-m

B. 1 kN-m

C. 10 N-m/s

D. 10 kN-m/s