Q.1
For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum pressure, and p₂ = Minimum pressure)
Q.2
Inter-cooling in multistage compressors is done
Q.3
The efficiency and work ratio of a gas turbine plant can be increased by
Q.4
The thrust of a jet propulsion power unit can be increased by
Q.5
In multistage compressor, the isothermal compression is achieved by
Q.6
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.
Q.7
Euler's equation can be used for
Q.8
The pressure and temperature conditions of air at the suction of compressor are
Q.9
If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Dia. of L.P. cylinder, and D₂ = Dia. of H.P. cylinder)
Q.10
Out of the following, from where you will prefer to take intake for air compressor
Q.11
For supplying intermittent small quantity of air at high pressure, following compressor is best suited
Q.12
The thrust on the rotor in a centrifugal compressor is produced by
Q.13
In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by
Q.14
If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by
Q.15
Volumetric efficiency of a compressor decreases with ________ in compression ratio.
Q.16
High air-fuel ratio in gas turbines
Q.17
In the axial flow gas turbine, the work ratio is the ratio of
Q.18
Inter cooling in compressors
Q.19
Isothermal compression efficiency can be attained by running the compressor
Q.20
Which of the following statement is correct relating to rocket engines?
Q.21
The power available for takeoff and climb in case of turbojet engine as compared to reciprocating engine is
Q.22
Gas turbines use following type of air compressor
Q.23
Fighter bombers use following type of engine
Q.24
The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.
Q.25
For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will
Q.26
Propulsive efficiency is defined as ratio of
Q.27
The degree of reaction is usually kept ________ for all types of axial flow compressors.
Q.28
The material commonly used for air craft gas turbine is
Q.29
Which one of the following is the effect of blade shape on performance of a centrifugal compressor?
Q.30
Intercooling in gas turbines
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