Aeroplanes employ following type of compressor
Aeroplanes employ following type of compressor
The thrust on the rotor in a centrifugal compressor is produced by
The thrust on the rotor in a centrifugal compressor is produced by
Cylinder clearance in a compressor should be
Cylinder clearance in a compressor should be
A rocket engine for the combustion of its fuel
A rocket engine for the combustion of its fuel
In a reciprocating air compressor, the compression work per kg of air
In a reciprocating air compressor, the compression work per kg of air
Isothermal compression efficiency, even when running at high speed, can be approached by using
Isothermal compression efficiency, even when running at high speed, can be approached by using
When air is to be compressed at a high pressure, then it is advantageous to use
When air is to be compressed at a high pressure, then it is advantageous to use
In air breathing jet engine, the jet is formed by expanding
In air breathing jet engine, the jet is formed by expanding
A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.
A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.
Out of the following, from where you will prefer to take intake for air compressor
Out of the following, from where you will prefer to take intake for air compressor
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
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
In multistage compressor, the isothermal compression is achieved by
In multistage compressor, the isothermal compression is achieved by
In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as
In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as
The air-fuel ratio in gas turbines is of the order of
The air-fuel ratio in gas turbines is of the order of
Axial flow compressor resembles
Axial flow compressor resembles
In the aircraft propellers
In the aircraft propellers
The ratio of specific weight/h.p. of gas turbine and I.C engines may be typically of the order of
The ratio of specific weight/h.p. of gas turbine and I.C engines may be typically of the order of
Pressure ratio in gas turbines is the ratio of
Pressure ratio in gas turbines is the ratio of
Which is false statement about multistage compression?
Which is false statement about multistage compression?
The blades of gas turbine are made of
The blades of gas turbine are made of
Stalling of blades in axial flow compressor is the phenomenon of
Stalling of blades in axial flow compressor is the phenomenon of
Volumetric efficiency of air compressors is of the order of
Volumetric efficiency of air compressors is of the order of
The ratio of work done per cycle to the swept volume in case of compressor is called
The ratio of work done per cycle to the swept volume in case of compressor is called
Actual compression curve is
Actual compression curve is
Which is false statement about air receivers?
Which is false statement about air receivers?
A rocket engine uses __________ for the combustion of its fuel.
A rocket engine uses __________ for the combustion of its fuel.
A 3 m³/min compressor means that it
A 3 m³/min compressor means that it
Work ratio of a gas turbine plant is ratio of
Work ratio of a gas turbine plant is ratio of
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.
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.
The type of rotary compressor used in gas turbines, is of
The type of rotary compressor used in gas turbines, is of
For minimum work required to compress and deliver a quantity of air by multistage compression
For minimum work required to compress and deliver a quantity of air by multistage compression
If the flow of air through the compressor is parallel to its axis, then the compressor is
If the flow of air through the compressor is parallel to its axis, then the compressor is
In turbo fan engine, the jet velocity as compared to turbojet engine is
In turbo fan engine, the jet velocity as compared to turbojet engine is
Mining industry usually employs following motive power
Mining industry usually employs following motive power
The clearance volume of the air compressor is kept minimum because
The clearance volume of the air compressor is kept minimum because
Which of the following statement is correct as regard to centrifugal compressors?
Which of the following statement is correct as regard to centrifugal compressors?
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
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
For speed above 3000 km/hour, it is more advantageous to use
For speed above 3000 km/hour, it is more advantageous to use
The pressure ratio in gas turbines is of the order of
The pressure ratio in gas turbines is of the order of
The absolute pressure of air at the outlet of a compressor is called
The absolute pressure of air at the outlet of a compressor is called
Rotary compressor is best suited for
Rotary compressor is best suited for
The compressor performance at higher altitude compared to sea level will be
The compressor performance at higher altitude compared to sea level will be
As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio
As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio
If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches
If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches
The capacity of a compressor is expressed in
The capacity of a compressor is expressed in
The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called
The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called
Which of the following fuels can be used in turbojet engines?
Which of the following fuels can be used in turbojet engines?
A rocket works with maximum overall efficiency when air craft velocity is equal to the
A rocket works with maximum overall efficiency when air craft velocity is equal to the
Maximum temperature in a gas turbine is of the order of
Maximum temperature in a gas turbine is of the order of
Separators are generally used in air compressor installations
Separators are generally used in air compressor installations
If the flow of air through the compressor is perpendicular to its axis, then it is a
If the flow of air through the compressor is perpendicular to its axis, then it is a
Mechanical efficiency of gas turbines as compared to I.C engines is
Mechanical efficiency of gas turbines as compared to I.C engines is
Losses in a centrifugal compressor are due to
Losses in a centrifugal compressor are due to
In a centrifugal compressor, an increase in speed at a given pressure ratio causes
In a centrifugal compressor, an increase in speed at a given pressure ratio causes
A rotary compressor is driven by an
A rotary compressor is driven by an
Reheating in gas turbine results in
Reheating in gas turbine results in
The volume of air delivered by the compressor is called
The volume of air delivered by the compressor is called
The maximum compression ratio in an actual single stage axial flow compressor is of the order of
The maximum compression ratio in an actual single stage axial flow compressor is of the order of
Which is false statement about advantages of multistage compressor in comparison to single stage compressor?
Which is false statement about advantages of multistage compressor in comparison to single stage compressor?
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
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
The maximum combustion pressure in gas turbine as compared to I.C. engine is
The maximum combustion pressure in gas turbine as compared to I.C. engine is
Ram compression in turbojet involves
Ram compression in turbojet involves
The volumetric efficiency for reciprocating air compressors is about
The volumetric efficiency for reciprocating air compressors is about
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
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
Reciprocating air compressor is best suited for
Reciprocating air compressor is best suited for
Surging is the phenomenon of
Surging is the phenomenon of
Volumetric efficiency is
Volumetric efficiency is
Standard air is the air at ________ and relative humidity of 36 percent.
Standard air is the air at ________ and relative humidity of 36 percent.
Separators in compressor installations are located
Separators in compressor installations are located
For supplying intermittent small quantity of air at high pressure, following compressor is best suited
For supplying intermittent small quantity of air at high pressure, following compressor is best suited
The pressure and temperature conditions of air at the suction of compressor are
The pressure and temperature conditions of air at the suction of compressor are
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of
Diffuser in a compressor is used to
Diffuser in a compressor is used to
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
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
Ramjet engine
Ramjet engine
The pressure of air at the beginning of the compression stroke is ________ the atmospheric pressure.
The pressure of air at the beginning of the compression stroke is ________ the atmospheric pressure.
More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than
More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as
Reheating in multistage expansion gas turbine results in
Reheating in multistage expansion gas turbine results in
Volumetric efficiency of a compressor decreases with ________ in compression ratio.
Volumetric efficiency of a compressor decreases with ________ in compression ratio.
Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on
Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on
The inlet pressure is always ________ the discharge pressure.
The inlet pressure is always ________ the discharge pressure.
The compression ratio in a gas turbine is of the order of
The compression ratio in a gas turbine is of the order of
A closed gas turbine in which fuel is burnt directly in the air is not possible because of
A closed gas turbine in which fuel is burnt directly in the air is not possible because of
To avoid moisture troubles, the branch connections from compressed air lines should be taken from
To avoid moisture troubles, the branch connections from compressed air lines should be taken from
Pick up the wrong statement about advantages of multistage compression
Pick up the wrong statement about advantages of multistage compression
Clearance volume in actual reciprocating compressors is essential
Clearance volume in actual reciprocating compressors is essential
The air is delivered ________ in one revolution in case of a three lobbed rotor.
The air is delivered ________ in one revolution in case of a three lobbed rotor.
The volumetric efficiency of a compressor
The volumetric efficiency of a compressor
A large clearance volume in a reciprocating compressor results in
A large clearance volume in a reciprocating compressor results in
The axial flow compressor is preferred in aircraft gas turbines because of
The axial flow compressor is preferred in aircraft gas turbines because of
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
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
Inter-cooling in gas turbine results in
Inter-cooling in gas turbine results in
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)
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)
Maximum delivery pressure is a rotary air compressor is of the order of
Maximum delivery pressure is a rotary air compressor is of the order of
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is
