 Home » Mechanical Engineering » Mechanical Engineering MCQ » Engineering Thermodynamics MCQ ### 1.The entropy may be expressed as a function of

• APressure and temperature
• BTemperature and volume
• CHeat and work
• DAll of these

Pressure and temperature

Explanation:

• AMono-atomic
• BDi-atomic
• CTri-atomic
• DPoly-atomic

Mono-atomic

Explanation:

• A2
• B4
• C8
• D16

2

Explanation:

### 4.For the same maximum pressure and temperature

• AOtto cycle is more efficient than Diesel cycle
• BDiesel cycle is more efficient than Otto cycle
• CDual cycle is more efficient than Otto and Diesel cycles
• DDual cycle is less efficient than Otto and Diesel cycles

Diesel cycle is more efficient than Otto cycle

Explanation:

### 5.Mixture of ice and water form a

• AClosed system
• BOpen system
• CIsolated system
• DHeterogeneous system

Heterogeneous system

Explanation:

• AMeter
• BCentimeter
• CKilometer
• DMillimeter

Meter

Explanation:

### 7.The unit of pressure in S.I. units is

• Akg/cm²
• Bmm of water column
• CPascal
• DDyne per square cm

Pascal

Explanation:

• AKilogram
• BGram
• CTonne
• DQuintal

Kilogram

Explanation:

### 9.During which of the following process does heat rejection takes place in Carnot cycle?

• AIsothermal expansion
• BIsentropic expansion
• CIsothermal compression
• DIsentropic compression

Isentropic compression

Explanation:

• A0
• B1
• CY
• D

1

Explanation:

### 11.Molecular volume of any perfect gas at 600 × 103 N/m² and 27°C will be

• A4.17 m3/kg mol
• B400 m3/kg mol
• C0.15 m3/kg mol
• D41.7 m3/kg mol

4.17 m3/kg mol

Explanation:

### 12.The absolute zero pressure can be attained at a temperature of

• A0°C
• B-273°C
• C273 K
• DNone of these

None of these

Explanation:

### 13.An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is

• AFeasible
• BImpossible
• CPossible
• DPossible, but with lot of sophistications

Possible, but with lot of sophistications

Explanation:

### 14.Which of the following items is not a path function?

• AHeat
• BWork
• CKinetic energy
• DThermal conductivity

Thermal conductivity

Explanation:

### 15.Addition of heat at constant pressure to a gas results in

• ARaising its temperature
• BRaising its pressure
• CRaising its volume
• DRaising its temperature and doing external work

Raising its temperature and doing external work

Explanation:

• AWatt
• BJoule
• Cjoule/s
• Djoule/m

Joule

Explanation:

• ASecond
• BMinute
• CHour
• DDay

Second

Explanation:

• BCelsius
• CFahrenheit
• DKelvin

Kelvin

Explanation:

• ANewton
• BPascal
• CErg
• DWatt

Watt

Explanation:

### 20.The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is

• A29.27 J/kmol °K
• B83.14 J/kmol °K
• C848 J/kmol °K
• D735 J/kmol °K