Engineering Thermodynamics MCQs

Question 1

If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly

Accepted Answer

Entropy

Answer

Temperature

Answer

Enthalpy

Answer

Internal energy

Question 2

A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is

Accepted Answer

+60 kJ

Answer

-140 kJ

Answer

-80 kJ

Answer

-40 kJ

Question 3

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

Accepted Answer

32

Answer

12

Answer

14

Answer

16

Question 4

The oxygen atom is ________ times heavier than the hydrogen atom.

Accepted Answer

16

Answer

2

Answer

8

Answer

32

Question 5

Heat and work are

Accepted Answer

Path functions

Answer

Point functions

Answer

System properties

Answer

Intensive properties

Question 6

During throttling process

Accepted Answer

All of the above

Answer

Heat exchange does not take place

Answer

No work is done by expanding steam

Answer

There is no change of internal energy of steam

Question 7

Universal gas constant is defined as equal to product of the molecular weight of the gas and

Accepted Answer

Gas constant

Answer

Specific heat at constant pressure

Answer

Specific heat at constant volume

Answer

Ratio of two specific heats

Question 8

The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when

Accepted Answer

Process is isentropic and specific heat does not change with temperature

Answer

Flow is uniform and steady

Answer

Process is isentropic

Answer

Process is isothermal

Question 9

The fuel mostly used in cement industry and in metallurgical processes is

Accepted Answer

Pulverized coal

Answer

Wood charcoal

Answer

Bituminous coke

Answer

Coke