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Compressors, Gas Turbines and Jet Engines MCQ Practice Test - Set 04

Review each question and reveal answers to strengthen your understanding

1 In jet engines the products of combustion after passing through the gas turbine are discharged into
✅ Correct Answer: 2
2 The air entry velocity m a rocket as compared to aircraft is
✅ Correct Answer: 4
3 The weight per horse power ratio for gas in Turbine as compared to I.C. engine and steam turbine is
✅ Correct Answer: 3
4 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
✅ Correct Answer: 4
5 The working fluid in a turbine is
✅ Correct Answer: 3
6 Gas turbine cycle with regenerator
✅ Correct Answer: 1
7 The compression ratio in a gas turbine is of the order of
✅ Correct Answer: 3
8 Reheating in multistage expansion gas turbine results in
✅ Correct Answer: 4
9 The main purpose of reheating in gas turbine is to
✅ Correct Answer: 3
10 Reheating in gas turbine results in
✅ Correct Answer: 4
11 Work ratio of a gas turbine plant is ratio of
✅ Correct Answer: 1
12 Work ratio of a gas turbine may be improved by
✅ Correct Answer: 4
13 Maximum temperature in a gas turbine is of the order of
✅ Correct Answer: 1
14 In air breathing jet engine, the jet is formed by expanding
✅ Correct Answer: 1
15 Ramjet engine
✅ Correct Answer: 2
16 For speed above 3000 km/hour, it is more advantageous to use
✅ Correct Answer: 2
17 A simple turbojet engine is basically
✅ Correct Answer: 2
18 Which of the following plants is smallest and lightest for generating a given amount of power?
✅ Correct Answer: 1
19 Which of the following plants is smallest and lightest for generating a given amount of power?
✅ Correct Answer: 1
20 The compressor performance at higher altitude compared to sea level will be
✅ Correct Answer: 3
21 Pick up the correct statement
✅ Correct Answer: 4
22 The ratio of the discharge pressure to the inlet pressure of air is called
✅ Correct Answer: 1
23 An air compressor may be controlled by
✅ Correct Answer: 4
24 The minimum work required for a three stage reciprocating air compressor is ________ the work required for each stage.
✅ Correct Answer: 3
25 The air power of the compressor is also known as
✅ Correct Answer: 1
26 The compressor capacity with decrease in suction temperature
✅ Correct Answer: 1
27 The maximum propulsion efficiency of a turbojet is attained at around following speed
✅ Correct Answer: 4
28 In a centrifugal compressor, the flow of air is ________ to the axis of compressor.
✅ Correct Answer: 2
29 Aeroplanes employ following type of compressor
✅ Correct Answer: 2
30 In a reciprocating air compressor, the compression work per kg of air
✅ Correct Answer: 3
31 The clearance volume of the air compressor is kept minimum because
✅ Correct Answer: 2
32 Free air is the air at
✅ Correct Answer: 1
33 In a single stage, single acting reciprocating air compressor, without clearance, the work-done on the air during isentropic compression is ________ the heat required to raise the temperature of air from T₁ to T₂ at a constant pressure.
✅ Correct Answer: 1
34 Standard air is the air at
✅ Correct Answer: 2
35 Isothermal compression efficiency, even when running at high speed, can be approached by using
✅ Correct Answer: 3
36 In a four stage compressor, if the pressure at the first and third stage is 1 bar and 16 bar, then the delivery pressure at the fourth stage will be
✅ Correct Answer: 2
37 Inter cooling in compressors
✅ Correct Answer: 2
38 The stagnation pressure rise in a centrifugal compressor takes place
✅ Correct Answer: 3
39 What will be the volume of air at 327°C if its volume at 27°C is 1.5 m³/ mt?
✅ Correct Answer: 1
40 A 3 m³/min compressor means that it
✅ Correct Answer: 2
41 Euler's equation is applicable for
✅ Correct Answer: 4
42 In a high pressure compressor, the delivery pressure is
✅ Correct Answer: 3
43 Which is false statement about air receivers?
✅ Correct Answer: 3
44 A rocket engine uses __________ for the combustion of its fuel.
✅ Correct Answer: 3
45 The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation
✅ Correct Answer: 3
46 For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by
✅ Correct Answer: 2
47 For slow speed large capacity compressor, following type of valve will be best suited
✅ Correct Answer: 3
48 The type of rotary compressor used in gas turbines, is of
✅ Correct Answer: 2
49 During base load operation, the best method of controlling compressor is
✅ Correct Answer: 1
50 Which is false statement about advantages of multistage compressor in comparison to single stage compressor?
✅ Correct Answer: 3
51 In a jet propulsion
✅ Correct Answer: 2
52 The ratio of isentropic work to Euler work is known as
✅ Correct Answer: 1
53 Inter-cooling in gas turbine results in
✅ Correct Answer: 1
54 If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity
✅ Correct Answer: 1
55 Fighter bombers use following type of engine
✅ Correct Answer: 1
56 The effective power of gas turbines is increased by adding the following in compressor
✅ Correct Answer: 1
57 High air-fuel ratio is used in gas turbines
✅ Correct Answer: 4
58 Air-fuel ratio in a jet engine will be of the order of
✅ Correct Answer: 1
59 In which case the air-fuel ratio is likely to be maximum?
✅ Correct Answer: 1
60 In turbo fan engine, the jet velocity as compared to turbojet engine is
✅ Correct Answer: 1
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