Compressors, Gas Turbines and Jet Engines Objective Questions with Answers - Set 15

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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