# Engineering Thermodynamics Questions And Answers – Set 28

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## Q1. The universal gas constant (or molar constant) of a gas is the product of

(A) Molecular mass of the gas and the gas constant
(B) Atomic mass of the gas and the gas constant
(C) Molecular mass of the gas and the specific heat at constant pressure
(D) Molecular mass of the gas and the specific heat at constant volume

## Q2. 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

(A) 1 × 102 N/m2
(B) 1 × 103 N/m2
(C) 1 × 104 N/m2
(D) 1 × 105 N/m2

## Q4. The amount of heat generated per kg of fuel is known as

(A) Calorific value
(B) Heat energy
(C) Lower calorific value
(D) Higher calorific value

## Q5. 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

## Q6. The mass of excess air supplied is equal to

(A) (23/100) × Mass of excess carbon
(B) (23/100) × Mass of excess oxygen
(C) (100/23) × Mass of excess carbon
(D) (100/23) × Mass of excess oxygen

(A) 3 to 6
(B) 5 to 8
(C) 15 to 20
(D) 20 to 30

(A) 0.287 J/kgK
(B) 2.87 J/kgK
(C) 28.7 J/kgK
(D) 287 J/kgK

## Q9. The entropy __ in an irreversible cyclic process.

(A) Remains constant
(B) Decreases
(C) Increases
(D) None of these

## Q10. If in the equation pvn = C, the value of n = ∝, then the process is called

(A) Constant volume process
(C) Constant pressure process
(D) Isothermal process

## Q11. The efficiency of Ericsson cycle is __ Carnot cycle.

(A) Greater than
(B) Less than
(C) Equal to
(D) None of these

## Q12. The hyperbolic process is governed by

(A) Boyle’s law
(B) Charles’ law
(C) Gay-Lussac law

(A) 3 to 6
(B) 5 to 8
(C) 15 to 20
(D) 20 to 30

## Q14. For a perfect gas, according to Boyle’s law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)

(A) p v = constant, if T is kept constant
(B) v/T = constant, if p is kept constant
(C) p/T = constant, if v is kept constant
(D) T/p = constant, if v is kept constant

## Q15. The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)

(A) Ru × T
(B) 1.5 Ru × T
(C) 2 Ru × T
(D) 3 Ru × T

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