# Practice Test: Question Set - 03

1. Superheated vapour behaves
(A) Exactly as gas
(B) As steam
(C) As ordinary vapour
(D) Approximately as a gas

2. Absolute zero pressure will occur
(A) At sea level
(B) When molecular momentum of the system becomes zero
(C) Under vacuum conditions
(D) At a temperature of 273°K

3. No liquid can exist as liquid at
(A) 273°K
(B) Vacuum
(C) Zero pressure
(D) Centre of earth

4. The unit of power in S.I. units is
(A) Newton
(B) Pascal
(C) Erg
(D) Watt

5. 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

6. The efficiency of Carnot cycle depends upon
(A) Temperature limits
(B) Volume compression ratio
(C) Cut-off ratio and compression ratio
(D) Pressure ratio

7. The natural solid fuel is
(A) Wood
(B) Coke
(C) Pulverised coal
(D) Anthracite coal

8. Intensive property of a system is one whose value
(A) Depends on the mass of the system, like volume
(B) Does not depend on the mass of the system, like temperature, pressure, etc.
(C) Is not dependent on the path followed but on the state
(D) Is dependent on the path followed and not on the state

9. Specific heat of air at constant pressure is equal to
(A) 0.17
(B) 0.21
(C) 0.24
(D) 1.0

10. Characteristic gas constant of a gas is equal to
(A) Cp /Cv
(B) Cv /Cp
(C) Cp - Cv
(D) Cp + Cv

11. The volumetric or molar specific heat at constant pressure is the product of
(A) Molecular mass of the gas and the specific heat at constant volume
(B) Atomic mass of the gas and the gas constant
(C) Molecular mass of the gas and the gas constant
(D) None of the above

12. The heat and mechanical energies are mutually convertible. This statement was established by
(A) Boyle
(B) Charles
(C) Joule
(D) None of these

13. The ratio of two specific heats of air is equal to
(A) 0.17
(B) 0.24
(C) 0.1
(D) 1.41

14. 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

15. 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

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Engineering Thermodynamics:
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