Practice Test: Question Set - 15
1. The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will
- (A) Increase first at
fast rate and then slow
- (B) Increase first at
slow rate and then fast
- (C) Decrease continuously
- (D) First increase, reach
maximum and then decrease
2. The working fluid in a turbine is
- (A) In two phases
- (B) In three phases
- (C) In a single phase
- (D) In the form of air and water mixture
3. Gas turbine cycle with regenerator
- (A) Increases thermal efficiency
- (B) Allows high compression ratio
- (C) Decreases heat loss
is exhaust
- (D) Allows operation at
very high altitudes
4. The compression ratio in a gas turbine is of the order of
- (A) 3.5 : 1
- (B) 5 : 1
- (C) 8 : 1
- (D) 12 : 1
5. Reheating in multistage expansion gas turbine results in
- (A) High thermal efficiency
- (B) Reduction in compressor work
- (C) Decrease of heat loss in exhaust
- (D) Maximum work output
6. The main purpose of reheating in gas turbine is to
- (A) Increase temperature
- (B) Reduce turbine size
- (C) Increase power output
- (D) Increase speed
7. Reheating in gas turbine results in
- (A) Increase of work ratio
- (B) Decrease of thermal efficiency
- (C) Decrease of work ratio
- (D) Both (A) and (B) above
8. Work ratio of a gas turbine plant is ratio of
- (A) Net work output and work done by turbine
- (B) Net work output and
heat supplied
- (C) Work done by turbine and heat supplied
- (D) Work done by turbine and net work output
9. Work ratio of a gas turbine may be improved by
- (A) Decreasing the
compression work
- (B) Increasing the
compression work
- (C) Increasing the
turbine work
- (D) Both (A) and (C)
above
10. Maximum temperature in a gas turbine is of the order of
- (A) 700°C
- (B) 2000°C
- (C) 1500°C
- (D) 1000°C
11. In air breathing jet engine, the jet is formed by expanding
- (A) Highly heated atmospheric air
- (B) Solids
- (C) Liquid
- (D) Plasma
12. Ramjet engine
- (A) Is self operating at zero flight speed
- (B) Is not self operating at zero flight speed
- (C) Requires no air for its operation
- (D) Produces a jet
consisting of plasma
13. For speed above 3000 km/hour, it is more advantageous to use
- (A) Turbojet engine
- (B) Ramjet engine
- (C) Propellers
- (D) Rockets
14. A simple turbojet engine is basically
- (A) A propeller system
- (B) Gas turbine engine
equipped with a propulsive nozzle and diffuse
- (C) Chemical rocket engine
- (D) Ramjet engine
15. Which of the following plants is smallest and lightest for generating a given amount of power?
- (A) Gas turbine plant
- (B) Petrol engine
- (C) Diesel engine
- (D) Solar plant
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