Engineering Thermodynamics MCQs

Question 1

Work done is zero for the following process

Accepted Answer

All of the above

Answer

Constant volume

Answer

Free expansion

Answer

Throttling

Question 2

The fuel mostly used in blast furnace for extracting pig iron from iron ores is

Accepted Answer

Hard coke

Answer

Soft coke

Answer

Pulverized coal

Answer

Bituminous coal

Question 3

On weight basis, air contains following parts of oxygen

Accepted Answer

23

Answer

21

Answer

25

Answer

73

Question 4

On volume basis, air contains following parts of oxygen

Accepted Answer

21

Answer

23

Answer

25

Answer

77

Question 5

A gas is compressed in a cylinder by a movable piston to a volume one half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be

Accepted Answer

300,000 Nm

Answer

300 Nm

Answer

30 Nm

Answer

3000 Nm

Question 6

Gases have

Accepted Answer

Two values of specific heat

Answer

Only one value of specific heat

Answer

No value of specific heat

Answer

Under some conditions one value and sometimes two values of specific heat

Question 7

According to Dalton's law, the total pressure of the mixture of gases is equal to

Accepted Answer

Sum of the partial pressures of all

Answer

Greater of the partial pressures of all

Answer

Average of the partial pressures of all

Answer

Sum of the partial pressures of all divided by average molecular weight

Question 8

When a gas is heated, change takes place in

Accepted Answer

All of these

Answer

Temperature

Answer

Pressure

Answer

Volume

Question 9

A sudden fall in the barometer reading is a sign of approaching

Accepted Answer

Storm

Answer

Fine weather

Answer

Rains

Answer

Cold wave