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Thermodynamics MCQs

51. For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

Dual cycle, Diesel cycle, Otto cycle

Otto cycle, Diesel cycle, Dual cycle

Dual cycle, Otto cycle, Diesel cycle

Diesel cycle, Otto cyc

✅ The correct answer is option A.

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

p v = constant, if T is kept constant

v/T = constant, if p is kept constant

p/T = constant, if v is kept constant

T/p = constant, if v i

✅ The correct answer is option A.

53. One molecule of oxygen is __________ times heavier than the hydrogen atom.

12

14

16

32

✅ The correct answer is option D.

54. When the gas is heated at constant pressure, the heat supplied

increases the internal energy of the gas

increases the temperature of the gas

does some external work during expansion

Both (B) and (C)

✅ The correct answer is option D.

55. The molecular mass of a substance is the number of times a molecule of that substance is heavier than the hydrogen atom.

TRUE

FALSE

✅ The correct answer is option A.

56. The throttling process is an irreversible steady flow expansion process.

Correct

Incorrect

✅ The correct answer is option A.

57. An open cycle gas turbine works on

Carnot cycle

Otto cycle

Joule’s cycle

Stirling cycle

✅ The correct answer is option C.

58. The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system.

is equal to

is not equal to

✅ The correct answer is option B.

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

positive

negative

positive or negative

✅ The correct answer is option A.

60. Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Kinetic theory of gase

✅ The correct answer is option B.

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