Practice Test: Question Set - 20
1. Fighter bombers use following type of engine
- (A) Turbojet
- (B) Turbo-propeller
- (C) Rocket
- (D) Ramjet
2. The effective power of gas turbines is increased by adding the following in compressor
- (A) Ammonia and water
vapour
- (B) Carbon dioxide
- (C) Nitrogen
- (D) Hydrogen
3. High air-fuel ratio is used in gas turbines
- (A) To increase the
output
- (B) To increase the
efficiency
- (C) To save fuel
- (D) To reduce the exit
temperature
4. Air-fuel ratio in a jet engine will be of the order of
- (A) 10: 1
- (B) 15: 1
- (C) 20: 1
- (D) 60: 1
5. In which case the air-fuel ratio is likely to be maximum?
- (A) Gas turbine
- (B) 4-stroke petrol engine
- (C) 4-stroke diesel engine
- (D) Multi cylinder engine
6. In turbo fan engine, the jet velocity as compared to turbojet engine is
- (A) Less
- (B) More
- (C) Same
- (D) May be less or more depending upon speed
7. Turbofan engine employs
- (A) One air stream
- (B) Two or more air streams
- (C) No air stream
- (D) Solid fuel firing
8. Pressure ratio in gas turbines is the ratio of
- (A) Compressor pressure ratio
- (B) Highest pressure to exhaust pressure
- (C) Inlet pressure to
exhaust pressure
- (D) Pressures across the turbine
9. Pick up the false statement
- (A) Gas turbine is a self
starting unit
- (B) Gas turbine does not
require huge quantity of water like steam plant
- (C) Exhaust losses in gas turbine are high due
to large mass flow rate
- (D) Overall efficiency of
gas turbine plant is lower than that of a reciprocating engine
10. The pressure and temperature conditions of air at the suction of compressor are
- (A) Atmospheric
- (B) Slightly more than atmospheric
- (C) Slightly less than
atmospheric
- (D) Pressure slightly
less than atmospheric and temperature slightly more than atmospheric
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