Gas Dynamics And Gas Turbines(Engineering > Mechanical Engineering > Compressors ) Questions and Answers

Question 1. Reheating in a gas turbine
  1.    increases the thermal efficiency
  2.    increases the compressor work
  3.    increases the turbine work
  4.    decreases the thermal efficiency
Explanation:-
Answer: Option A. -> increases the thermal efficiency
Answer: (a).increases the thermal efficiency
Question 2. In a compressed air system, the temperature of air discharged from the air motor is __________ than the initial compressor intake temperature.
  1.    more
  2.    less
  3.    Can't say
  4.    None of these
Explanation:-
Answer: Option B. -> less
Answer: (b).less
Question 3. In a single stage, single acting reciprocating air compressor, without clearance, the workdone on the air during isentropic compression is __________ the heat required to raise the temperature of air from T1 to T2 at a constant pressure.
  1.    equal to
  2.    less than
  3.    greater than
  4.    None of these
Explanation:-
Answer: Option A. -> equal to
Answer: (a).equal to
Question 4. Workdone by an air compressor __________ upon the way in which the air is compressed.
  1.    depends
  2.    does not depend
  3.    Can't say
  4.    None of these
Explanation:-
Answer: Option A. -> depends
Answer: (a).depends
Question 5. In a compressor, work is done on the piston during suction of air and work is done by the piston during compression as well as delivery of air.
  1.    Agree
  2.    Disagree
  3.    Can't say
  4.    None of these
Explanation:-
Answer: Option A. -> Agree
Answer: (a).Agree
Question 6. The compressor efficiency is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
  1.    Correct
  2.    Incorrect
  3.    Can't say
  4.    None of these
Explanation:-
Answer: Option B. -> Incorrect
Answer: (b).Incorrect
Question 7. In open cycle turbo-jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the
  1.    thrust and range of aircraft
  2.    efficiency of the engine
  3.    both (a) and (b)
  4.    none of these
Explanation:-
Answer: Option A. -> thrust and range of aircraft
Answer: (a).thrust and range of aircraft
Question 8. Gas turbine as compared to internal combustion engine
  1.    can be driven at a very high speed
  2.    produces uniform torque
  3.    has more efficiency
  4.    all of these
Explanation:-
Answer: Option D. -> all of these
Answer: (d).all of these
Question 9. In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.
  1.    True
  2.    False
  3.    Can't say
  4.    None of these
Explanation:-
Answer: Option A. -> True
Answer: (a).True
Question 10. The performance of air compressor at high altitudes will be __________ as compared to that at sea level.
  1.    same
  2.    lower
  3.    higher
  4.    None of these
Explanation:-
Answer: Option B. -> lower
Answer: (b).lower
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