# Mechanical Engineering Thermodynamics mcq – Set 05

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## Q1. Which of the following variables controls the physical properties of a perfect gas?

(A) Pressure
(B) Temperature
(C) Volume
(D) All of the above

## Q2. The hard coke is obtained when carbonization of coal is carried out at

(A) 500° to 700°C
(B) 700° to 900°C
(C) 300° to 500°C
(D) 900° to 1100°C

(A) 0.17
(B) 0.24
(C) 0.1
(D) 1.41

## Q4. The fuel mostly used in steam boilers is

(A) Brown coal
(B) Peat
(C) Coking bituminous coal
(D) Non-coking bituminous coal

(A) Pressure
(B) Temperature
(C) Density
(D) Heat

(A) 2
(B) 4
(C) 8
(D) 16

(A) Mass
(B) Temperature
(C) Energy
(D) Volume

## Q8. Boyle’s law i.e. pV = constant is applicable to gases under

(A) All ranges of pressures
(B) Only small range of pressures
(C) High range of pressures

## Q9. An isolated system is one in which

(A) Mass does not cross boundaries of the system, though energy may do so
(B) Neither mass nor energy crosses the boundaries of the system
(C) Both energy and mass cross the boundaries of the system
(D) Mass crosses the boundary but not the energy

(A) 21
(B) 23
(C) 25
(D) 73

(A) Temperature
(B) Pressure
(C) Volume
(D) All of these

## Q12. Otto cycle is also known as

(A) Constant pressure cycle
(B) Constant volume cycle
(C) Constant temperature cycle
(D) Constant temperature and pressure cycle

## Q13. The condition for the reversibility of a cycle is

(A) The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
(B) All the processes, taking place in the cycle of operation, must be extremely slow
(C) The working parts of the engine must be friction free
(D) All of the above

## Q14. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are

(A) Path functions
(B) Point functions
(C) Cyclic functions
(D) Real functions

## Q15. Which of the following is the property of a system?

(A) Pressure and temperature
(B) Volume and density
(C) Enthalpy and entropy
(D) All of the above

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