Q.1
Pressure ratio in gas turbines is the ratio of
Q.2
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of
Q.3
Volumetric efficiency is
Q.4
The compression ratio in a gas turbine is of the order of
Q.5
The pressure ratio in gas turbines is of the order of
Q.6
In air breathing jet engine, the jet is formed by expanding
Q.7
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
Q.8
Reciprocating air compressor is best suited for
Q.9
Volumetric efficiency of air compressors is of the order of
Q.10
The inlet pressure is always ________ the discharge pressure.
Q.11
The compressor performance at higher altitude compared to sea level will be
Q.12
Rotary compressor is best suited for
Q.13
Losses in a centrifugal compressor are due to
Q.14
Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on
Q.15
Separators are generally used in air compressor installations
Q.16
A 3 m³/min compressor means that it
Q.17
The axial flow compressor is preferred in aircraft gas turbines because of
Q.18
In the aircraft propellers
Q.19
Diffuser in a compressor is used to
Q.20
Clearance volume in actual reciprocating compressors is essential
Q.21
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
Q.22
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
Q.23
A large clearance volume in a reciprocating compressor results in
Q.24
The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called
Q.25
The air is delivered ________ in one revolution in case of a three lobbed rotor.
Q.26
Isothermal compression efficiency, even when running at high speed, can be approached by using
Q.27
A rotary compressor is driven by an
Q.28
The capacity of a compressor is expressed in
Q.29
The absolute pressure of air at the outlet of a compressor is called
Q.30
The ratio of work done per cycle to the swept volume in case of compressor is called
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