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What is the correct answer?

4

The stagnation pressure rise in a centrifugal compressor takes place

A. In the diffuser only

B. In the impeller only

C. In the diffuser and impeller

D. In the inlet guide vanes only

Correct Answer :

C. In the diffuser and impeller


Related Questions

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4

In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.

A. Inlet whirl velocity

B. Outlet whirl velocity

C. Inlet velocity of flow

D. Outlet velocity of flow

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4

If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

A. 1 - k + k (p₁/p₂)1/n

B. 1 + k - k (p₂/p₁)1/n

C. 1 - k + k (p₁/p₂) n- 1/n

D. 1 + k - k (p₂/p₁) n-1/n

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4

For supplying intermittent small quantity of air at high pressure, following compressor is best suited

A. Centrifugal

B. Reciprocating

C. Axial

D. Screw

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4

A rocket engine for the combustion of its fuel

A. Carries its own oxygen

B. Uses surrounding air

C. Uses compressed atmospheric air

D. Does not require oxygen

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4

Ram compression in turbojet involves

A. Reduction of speed of incoming air and conversion of part of it into pressure energy

B. Compression of inlet air

C. Increasing speed of incoming air

D. Lost work

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4

Which of the following statement is correct relating to rocket engines?

A. The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel

B. The stagnation conditions exist at the combustion chamber

C. The exit velocities of exhaust gases are much higher than those in jet engine

D. All of the above

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4

The blades of gas turbine are made of

A. High nickel alloy

B. Stainless steel

C. Carbon steel

D. High alloy steel

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4

Losses in a centrifugal compressor are due to

A. Inlet losses

B. Impeller channel losses

C. Diffuser losses

D. All of the above

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4

Actual compression curve is

A. Same as isothermal

B. Same as adiabatic

C. Better than isothermal and adiabatic

D. In between isothermal and adiabatic

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4

1 m of air at atmospheric condition weighs approximately

A. 0.5 kg

B. 1.0 kg

C. 1.3 kg

D. 2.2 kg

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4

The closed cycle in gas turbines

A. Provides greater flexibility

B. Provides lesser flexibility

C. In never used

D. Is used when gas is to be burnt

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4

The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

A. r -1

B. 1 - r -1

C. 1 - (1/r) -1/

D. 1 - (1/r) /-1

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4

If the flow of air through the compressor is parallel to its axis, then the compressor is

A. Reciprocating compressor

B. Centrifugal compressor

C. Axial flow compressor

D. Turbo compressor

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4

In a jet propulsion

A. The propulsive matter is ejected from within the propelled body

B. The propulsive matter is caused to flow around the propelled body

C. Its functioning does not depend upon presence of air

D. None of the above

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4

The work done per unit mass of air in compression will be least when n is equal to

A. 1

B. 1.2

C. 1.3

D. 1.4

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4

The volume of air delivered by the compressor is called

A. Free air delivery

B. Compressor capacity

C. Swept volume

D. None of these

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4

When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

A. Equal to

B. Less than

C. More than

D. None of these

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4

Gas turbine works on

A. Brayton or Atkinson cycle

B. Carnot cycle

C. Rankine cycle

D. Erricson cycle

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4

The ratio of isentropic work to Eulers work is known as

A. Compressor efficiency

B. Isentropic efficiency

C. Euler's efficiency

D. Pressure coefficient

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4

The stagnation pressure rise in a centrifugal compressor takes place

A. In the diffuser only

B. In the impeller only

C. In the diffuser and impeller

D. In the inlet guide vanes only

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4

The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Intercooler pressure, and p₃ = Delivery pressure of air)

A. p₂ = p₁ × p₃

B. p₂ = p₁/p₃

C. p₂ = p₁ × p₂

D. p₂ = p₃/p₁

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4

The inlet pressure is always ________ the discharge pressure.

A. Equal to

B. Less than

C. More than

D. None of these

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4

Pick up the wrong statement

A. Pulsejet requires no ambient air for propulsion

B. Ramjet engine has no turbine

C. Turbine drives compressor in a Turbojet

D. Bypass turbojet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy

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4

Rotary compressors are used for delivering

A. Small quantities of air at high pressures

B. Large quantities of air at high pressures

C. Small quantities of air at low pressures

D. Large quantities of air at low pressures

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4

Which of the following plants is smallest and lightest for generating a given amount of power?

A. Gas turbine plant

B. Petrol engine

C. Diesel engine

D. Solar plant

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4

A centrifugal compressor works on the principle of

A. Conversion of pressure energy into kinetic energy

B. Conversion of kinetic energy into pressure energy

C. Centripetal action

D. Generating pressure directly

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4

The gas in cooling chamber of a closed cycle gas turbine is cooled at

A. Constant volume

B. Constant temperature

C. Constant pressure

D. None of these

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4

A rotary compressor is driven by an

A. Electric motor

B. Engine

C. Either (A) or (B)

D. None of these

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4

Only rocket engines can be propelled to space because

A. They can generate very high thrust

B. They have high propulsion efficiency

C. These engines can work on several fuels

D. They are not air breathing engines

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4

The most efficient method of compressing air is to compress it

A. Isothermally

B. Adiabatically

C. Isentropically

D. Isochronically