# Mechanical Engineering Thermodynamics mcq – Set 02

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(A) Meter
(B) Centimeter
(C) Kilometer
(D) Millimeter

## Q2. For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

(A) V/T = constant, if p is kept constant
(B) P v = constant, if T is kept constant
(C) T/P = constant, if v is kept constant
(D) P/T = constant, if v is kept constant

(A) Newton
(B) Pascal
(C) Erg
(D) Watt

## Q4. According to Avogadro’s Hypothesis

(A) The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
(B) The sum of partial pressure of mixture of two gases is sum of the two
(C) Product of the gas constant and the molecular weight of an ideal gas is constant
(D) Gases have two values of specific heat

## Q5. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

(B) Isothermal process
(C) Hyperbolic process
(D) Polytropic process

(A) Second
(B) Minute
(C) Hour
(D) Day

## Q7. The gas turbine cycle with regenerator improves

(A) Work ratio
(B) Thermal efficiency
(C) Avoid pollution
(D) None of these

## Q8. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

(A) A temperature of 273.16°C
(B) A temperature of 0°C
(C) A temperature of 273 °K
(D) A negative pressure and 0°C temperature

## Q9. Stirling and Ericsson cycles are

(A) Quasi-static cycles
(B) Reversible cycles
(C) Semi-reversible cycles
(D) Irreversible cycles

## Q10. Which of the following is the lightest and most volatile liquid fuel?

(A) Gasoline
(B) Kerosene
(C) Fuel oil
(D) None of these

(A) Kilogram
(B) Gram
(C) Tonne
(D) Quintal

## Q12. The compression ratio is the ratio of

(A) Total volume to swept volume
(B) Swept volume to clearance volume
(C) Swept volume to total volume
(D) Total volume to clearance volume

## Q13. The efficiency of Carnot cycle depends upon

(A) Temperature limits
(B) Volume compression ratio
(C) Cut-off ratio and compression ratio
(D) Pressure ratio

## Q14. Reheating in a gas turbine

(A) Increases the compressor work
(B) Increases the turbine work
(C) Increases the thermal efficiency
(D) Decreases the thermal efficiency

## Q15. The value of n = 1 in the polytropic process indicates it to be

(A) Reversible process
(B) Isothermal process