Home
Current Affairs January 2024

What is the correct answer?

4

The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

A. Rotor to static enthalpy rise in the stator

B. Stator to static enthalpy rise in the rotor

C. Rotor to static enthalpy rise in the stage

D. Stator to static enthalpy rise in the stage

Correct Answer :

C. Rotor to static enthalpy rise in the stage


Related Questions

What is the correct answer?

4

High air-fuel ratio is used in gas turbines

A. To increase the output

B. To increase the efficiency

C. To save fuel

D. To reduce the exit temperature

What is the correct answer?

4

What will be the volume of air at 327°C if its volume at 27°C is 1.5 m³/ mt?

A. 3 m³/ mt.

B. 1.5 m³/ mt.

C. 18 m³/ mt.

D. 6 m³/ mt.

What is the correct answer?

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

What is the correct answer?

4

The fuel consumption in gas turbines is accounted for by

A. Lower heating value

B. Higher heating value

C. Heating value

D. Higher calorific value

What is the correct answer?

4

The advantage of multistage compression over single stage compression is

A. Lower power consumption per unit of air delivered

B. Higher volumetric efficiency

C. Decreased discharge temperature

D. All of the above

What is the correct answer?

4

A closed gas turbine in which fuel is burnt directly in the air is not possible because of

A. Paucity of O2

B. Increasing gas temperature

C. High specific volume

D. High friction losses

What is the correct answer?

4

Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm. The air pressure will be

A. 1.03 kg/cm²

B. 1.06 kg/cm²

C. 1.00 kg/cm²

D. 0.53 kg/cm²

What is the correct answer?

4

To avoid moisture troubles, the compressed air main line should

A. Rise gradually towards the point of use

B. Drop gradually towards the point of use

C. Be laid vertically

D. Be laid exactly horizontally

What is the correct answer?

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

What is the correct answer?

4

The air is delivered ________ in one revolution in case of a three lobbed rotor.

A. Two times

B. Three times

C. Four times

D. Six times

What is the correct answer?

4

The compressed air may be used

A. In gas turbine plants

B. For operating pneumatic drills

C. In starting and supercharging of I.C. engines

D. All of the above

What is the correct answer?

4

Stalling of blades in axial flow compressor is the phenomenon of

A. Air stream blocking the passage

B. Motion of air at sonic velocity

C. Unsteady periodic and reversed flow

D. Air stream not able to follow the blade contour

What is the correct answer?

4

The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

A. 0.1 %

B. 0.5 %

C. 1.0 %

D. 5 %

What is the correct answer?

4

The capacity of compressor will be highest when its intake temperature is

A. Lowest

B. Highest

C. Anything

D. Atmospheric

What is the correct answer?

4

The air entry velocity m a rocket as compared to aircraft is

A. Same

B. More

C. Less

D. Zero

What is the correct answer?

4

The work ratio of simple gas turbine cycle depends on

A. Pressure ratio

B. Maximum cycle temperature

C. Minimum cycle temperature

D. All of the above

What is the correct answer?

4

For minimum work required to compress and deliver a quantity of air by multistage compression

A. The compression ratio in each stage should be same

B. The intercooling should be perfect

C. The workdone in each stage should be same

D. All of the above

What is the correct answer?

4

Which of the following fuels can be used in turbojet engines?

A. Liquid hydrogen

B. High speed diesel oil

C. Kerosene

D. Methyl alcohol

What is the correct answer?

4

Rotary compressor is best suited for

A. Large quantity of air at high pressure

B. Small quantity of air at high pressure

C. Small quantity of air at low pressure

D. Large quantity of air at low pressure

What is the correct answer?

4

In a jet engine, the air-fuel ratio is

A. 30 : 1

B. 40 : 1

C. 50 : 1

D. 60 : 1

What is the correct answer?

4

The temperature of air at the beginning of the compression stroke is ________ the atmospheric temperature.

A. Equal to

B. Less than

C. More than

D. None of these

What is the correct answer?

4

The air-fuel ratio in gas turbines is of the order of

A. 7 : 1

B. 15 : 1

C. 30 : 1

D. 50 : 1.

What is the correct answer?

4

In air breathing jet engine, the jet is formed by expanding

A. Highly heated atmospheric air

B. Solids

C. Liquid

D. Plasma

What is the correct answer?

4

For perfect intercooling in a three stage compressor

A. p₂/p₁ = p₃/p₂ = p₄/p₃

B. p₃/p₁ = p₄/p₂

C. p₁ p₂ = p₃ p₄

D. p₁ p₃ = p₂ p₄

What is the correct answer?

4

Diffuser in a compressor is used to

A. Increase velocity

B. Make the flow streamline

C. Convert pressure energy into kinetic energy

D. Convert kinetic energy into pressure energy

What is the correct answer?

4

The air power of the compressor is also known as

A. Indicated power

B. Brake power

C. Frictional power

D. None of these

What is the correct answer?

4

Ratio of indicated H.P. and brake H.P. is known as

A. Mechanical efficiency

B. Volumetric efficiency

C. Isothermal efficiency

D. Adiabatic efficiency

What is the correct answer?

4

The maximum combustion pressure in gas turbine as compared to I.C. engine is

A. More

B. Less

C. Same

D. Depends on other factors

What is the correct answer?

4

A large clearance volume in a reciprocating compressor results in

A. Reduced volume flow rate

B. Increased volume flow rate

C. Lower suction pressure

D. Lower delivery pressure

What is the correct answer?

4

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

A. Increase

B. Decrease

C. Remain unaffected

D. Other factors control it