Mechanical Engineering Thermodynamics mcq – Set 05

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All questions answers in the last paragraph

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

Q3. The ratio of two specific heats of air is equal to

(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

Q5. Which of the following is not the intensive property?

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

Q6. One molecule of oxygen consists of __ atoms of oxygen.

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

Q7. Which of the following is an intensive property of a thermodynamic system?

(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
(D) Steady change 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

Q10. On weight basis, air contains following parts of oxygen

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

Q11. When a gas is heated, change takes place in

(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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