Engineering Thermodynamics MCQs

Question 1

General gas equation is

Accepted Answer

PV = mRT

Answer

PV = nRT

Answer

PV = C

Answer

PV = KiRT

Question 2

Petrol is distilled at

Accepted Answer

65° to 220°C

Answer

220° to 345°C

Answer

345° to 470°C

Answer

470° to 550°C

Question 3

The calorific value of gaseous fuel is expressed in

Accepted Answer

kJ/m3

Answer

kJ

Answer

kJ/kg

Answer

kJ/m2

Question 4

The efficiency of Diesel cycle increases with

Accepted Answer

Decrease in cut-off

Answer

Increase in cut-off

Answer

Constant cut-off

Answer

None of these

Question 5

The efficiency of Carnot cycle is maximum for

Accepted Answer

Reversible engine

Answer

Gas engine

Answer

Petrol engine

Answer

Steam engine

Question 6

Boyle's law i.e. pV = constant is applicable to gases under

Accepted Answer

Only small range of pressures

Answer

All ranges of pressures

Answer

High range of pressures

Answer

Steady change of pressures

Question 7

The state of a substance whose evaporation from its liquid state is complete, is known as

Accepted Answer

Perfect gas

Answer

Vapour

Answer

Steam

Answer

Air

Question 8

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

Accepted Answer

pv = constant, if T is kept constant

Answer

$$\frac{{	ext{v}}}{{	ext{T}}}$$ = constant, if p is kept constant

Answer

$$\frac{{	ext{T}}}{{	ext{p}}}$$ = constant, if v is kept constant

Answer

$$\frac{{	ext{p}}}{{	ext{T}}}$$ = constant, if v is kept constant

Question 9

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

Accepted Answer

pv = constant, if T is kept constant

Answer

$$\frac{{	ext{v}}}{{	ext{T}}}$$ = constant, if p is kept constant

Answer

$$\frac{{	ext{p}}}{{	ext{T}}}$$ = constant, if v is kept constant

Answer

$$\frac{{	ext{T}}}{{	ext{p}}}$$ = constant, if v is kept constant