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

Compressors, Gas Turbines and Jet Engines
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

Vt > Vo

U < Vo

Vi = Vo

V = Uo

Vt > Vo

U < Vo

Vi = Vo

V = Uo

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Compressors, Gas Turbines and Jet Engines
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.

Less than

None of these

Equal to

Greater than

Less than

None of these

Equal to

Greater than

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Compressors, Gas Turbines and Jet Engines
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

W₁/W₂ = n₂/n₁

W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)

W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)

W₁/W₂ = n₁/n₂

W₁/W₂ = n₂/n₁

W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)

W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)

W₁/W₂ = n₁/n₂

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Compressors, Gas Turbines and Jet Engines
Ramjet engine

Requires no air for its operation

Is not self operating at zero flight speed

Is self operating at zero flight speed

Produces a jet consisting of plasma

Requires no air for its operation

Is not self operating at zero flight speed

Is self operating at zero flight speed

Produces a jet consisting of plasma

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Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Three times

Equal to

Double

Six times

Three times

Equal to

Double

Six times

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Compressors, Gas Turbines and Jet Engines
In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ________ of the piston.

One stroke

Two strokes

Three strokes

Four strokes

One stroke

Two strokes

Three strokes

Four strokes

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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines 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

Compressors, Gas Turbines and Jet Engines 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.

Compressors, Gas Turbines and Jet Engines 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

Compressors, Gas Turbines and Jet Engines Ramjet engine

Compressors, Gas Turbines and Jet Engines The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Compressors, Gas Turbines and Jet Engines In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ________ of the piston.

Compressors, Gas Turbines and Jet Engines
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

Compressors, Gas Turbines and Jet Engines
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.

Compressors, Gas Turbines and Jet Engines
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

Compressors, Gas Turbines and Jet Engines
Ramjet engine

Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Compressors, Gas Turbines and Jet Engines
In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ________ of the piston.