Practice Test: Question Set - 18
1. When the expansion or compression takes place according to the law pvn = C, the process is known as
- (A) Isothermal
process
- (B) Adiabatic
process
- (C) Hyperbolic
process
- (D) Polytropic
process
2. The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to
- (A) 0
- (B) 1
- (C) γ
- (D) ∝
3. One kilowatt is equal to
- (A) 1 N-m/s
- (B) 100 N-m
- (C) 1000 N-m/s
- (D) 1 × 106 N-m/s
4. The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.
- (A) Boyle's law
- (B) Charle's law
- (C) Gay-Lussac
law
- (D) Joule's law
5. The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.
- (A) 1 g
- (B) 10 g
- (C) 100 g
- (D) 1000 g
6. The work ratio of a gas turbine plant is given by
- (A) (Net work
output)/(Work-done by the turbine)
- (B) (Net work
output)/(Heat supplied)
- (C) (Actual temperature
drop)/(Isentropic temperature drop)
- (D) (Isentropic
increase in temperature)/(Actual increase in temperature)
7. The variables which control the physical properties of a perfect gas are
- (A) Pressure
exerted by the gas
- (B) Volume
occupied by the gas
- (C) Temperature
of the gas
- (D) All of these
8. An open system is one in which
- (A) Heat and
work crosses the boundary of the system, but the mass of the working substance
does not crosses the boundary of the system
- (B) Mass of the
working substance crosses the boundary of the system but the heat and work does
not crosses the boundary of the system
- (C) Both the
heat and work as well as mass of the working substance crosses the boundary of
the system
- (D) Neither the
heat and work nor the mass of the working substance crosses the boundary of the
system
9. Which of the following statement is correct?
- (A) The increase
in entropy is obtained from a given quantity of heat at a low temperature.
- (B) The change
in entropy may be regarded as a measure of the rate of the availability or
unavailability of heat for transformation into work.
- (C) The entropy
represents the maximum amount of work obtainable per degree drop in
temperature.
- (D) All of the
above
10. The calorific value of gaseous fuel is expressed in
- (A) kJ
- (B) kJ/kg
- (C) kJ/m2
- (D) kJ/m3
11. Which of the following is the correct statement of the second law of thermodynamics?
- (A) It
is impossible to construct an engine working on a cyclic process, whose sole
purpose is to convert heat energy into work.
- (B) It is
impossible to transfer heat from a body at a lower temperature to a higher
temperature, without the aid of an external source.
- (C) There is a
definite amount of mechanical energy, which can be obtained from a given
quantity of heat energy.
- (D) All of the
above
12. The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is
- (A) Equal to one
- (B) Less than
one
- (C) Greater than
one
- (D) None of
these
13. The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)
- (A) v1/v2
- (B) v2/v1
- (C) (v1 + v2)/v1
- (D) (v1 + v2)/v2
14. Coke is produced
- (A) When
coal is first dried and then crushed to a fine powder by pulverizing machine
- (B) From
the finely ground coal by molding under pressure with or without a binding
material
- (C) When coal is
strongly heated continuously for 42 to 48 hours in the absence of air in a
closed vessel
- (D) By heating
wood with a limited supply of air to a temperature not less than 280°C
15. The hard coke is obtained when carbonization of coal is carried out at
- (A) 300° to
500°C
- (B) 500° to 700°C
- (C) 700° to
900°C
- (D) 900° to
1100°C
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