Engineering Thermodynamics MCQs

Question 1

The efficiency of Joule cycle is

Accepted Answer

Less than Carnot cycle

Answer

Equal to Carnot cycle

Answer

Greater than Carnot cycle

Answer

None of these

Question 2

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

Accepted Answer

54 kJ

Answer

30 kJ

Answer

84 kJ

Answer

114 kJ

Question 3

Zeroth law of thermodynamics

Accepted Answer

States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

Answer

Deals with conversion of mass and energy

Answer

Deals with reversibility and irreversibility of process

Answer

Deals with heat engines

Question 4

First law of thermodynamics

Accepted Answer

All of the above

Answer

Enables to determine change in internal energy of the system

Answer

Does not enable to determine change in entropy

Answer

Provides relationship between heat, work and internal energy

Question 5

According to first law of thermodynamics

Accepted Answer

Total energy of a system remains constant

Answer

Work done by a system is equal to heat transferred by the system

Answer

Total internal energy of a system during a process remains constant

Answer

Internal energy, enthalpy and entropy during a process remain constant

Question 6

According to Clausius statement of second law of thermodynamics

Accepted Answer

Heat can't be transferred from low temperature to high temperature source without the aid of external energy

Answer

Heat can't be transferred from low temperature source to high temperature source

Answer

Heat can be transferred for low temperature to high temperature source by using refrigeration cycle

Answer

Heat can be transferred from low temperature to high temperature source if COP of process is more than unity

Question 7

The statement that molecular weights of all gases occupy the same volume is known as

Accepted Answer

Avogadro's hypothesis

Answer

Dalton's law

Answer

Gas law

Answer

Law of thermodynamics

Question 8

In a no flow reversible process for which p = (-3V + 15) × 105 N/m2, V changes from 1 m3 to 2 m3. The work done will be about

Accepted Answer

10 × 105 joules

Answer

100 × 105 joules

Answer

1 × 105 joules

Answer

10 × 105 kilo joules

Question 9

The ratio of molar specific heats for mono-atomic gas is

Accepted Answer

1.67

Answer

1

Answer

1.4

Answer

1.87