Home
Current Affairs January 2024

What is the correct answer?

4

An aftercooler is used to

A. Remove impurities from air

B. Reduce volume of air

C. Cause moisture and oil vapour to drop out

D. Cool the air

Correct Answer :

C. Cause moisture and oil vapour to drop out


Related Questions

What is the correct answer?

4

The net work input required for compressor with increase in clearance volume

A. Increases

B. Decreases

C. Remains same

D. Increases/decreases depending on compressor capacity

What is the correct answer?

4

The compressor performance at higher altitude compared to sea level will be

A. Same

B. Higher

C. Lower

D. Dependent on other factors

What is the correct answer?

4

It is not possible to use closed gas turbine cycle in aeronautical engines because

A. It is inefficient

B. It is bulky

C. It requires cooling water for its operation

D. None of the above

What is the correct answer?

4

The working fluid in a turbine is

A. In two phases

B. In three phases

C. In a single phase

D. In the form of air and water mixture

What is the correct answer?

4

Euler's equation is applicable for

A. Centrifugal compressor

B. Axial compressor

C. Pumps

D. All of the above

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

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

Aeroplanes employ following type of compressor

A. Radial flow

B. Axial flow

C. Centrifugal

D. None of the above

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

The thermodynamic efficiency of rotary compressor is based on

A. Isothermal compression

B. Adiabatic compression

C. Isentropic compression

D. Polytropic compression

What is the correct answer?

4

When the outlet angle from the rotor of a centrifugal compressor is more than 90°, then the blades are said to be

A. Forward curved

B. Backward curved

C. Radial

D. None of these

What is the correct answer?

4

The inlet pressure is always ________ the discharge pressure.

A. Equal to

B. Less than

C. More than

D. None of these

What is the correct answer?

4

Losses in a centrifugal compressor are due to

A. Inlet losses

B. Impeller channel losses

C. Diffuser losses

D. All of the above

What is the correct answer?

4

Out of the following, from where you will prefer to take intake for air compressor

A. From an air conditioned room maintained at 20°C

B. From outside atmosphere at 1°C

C. From coal yard side

D. From a side where cooling tower is located nearby

What is the correct answer?

4

A rocket engine uses ________ for the combustion of its fuel.

A. Surrounding air

B. Compressed atmospheric air

C. Its own oxygen

D. None of these

What is the correct answer?

4

The maximum delivery pressure in a rotary air compressor is

A. 10 bar

B. 20 bar

C. 30 bar

D. 50 bar

What is the correct answer?

4

In gas turbines, high thermal efficiency is obtained in

A. Closed cycle

B. Open cycle

C. Both of the above

D. Closed/open depending on other considerations

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

For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum pressure, and p₂ = Minimum pressure)

A. (p₁ - p₂)/2

B. (p₁ + p₂)/2

C. p₁/p₂

D. p₁ p₂

What is the correct answer?

4

Water is injected in gas turbine cycle to

A. Control temperature

B. Control output of turbine

C. Control fire hazards

D. Increase efficiency

What is the correct answer?

4

In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

A. Vacuum

B. Atmospheric air

C. Compressed air

D. Oxygen alone

What is the correct answer?

4

In a closed cycle gas turbine, the air is compressed

A. Isothermally

B. Polytropically

C. Isentropically

D. None of these

What is the correct answer?

4

In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone is minimum during

A. Isothermal compression

B. Isentropic compression

C. Polytropic compression

D. None of these

What is the correct answer?

4

Cylinder clearance in a compressor should be

A. As large as possible

B. As small as possible

C. About 50% of swept volume

D. About 100% of swept volume

What is the correct answer?

4

In a high pressure compressor, the delivery pressure is

A. 1 to 5 bar

B. 5 to 8 bar

C. 8 to 10 bar

D. 10 to 15 bar

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

Which of the following statement is correct?

A. The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency

B. The compression ratio for the compressor is always greater than unity

C. The compressor capacity is the ratio of workdone per cycle to the stroke volume

D. During isothermal compression of air, the workdone in a compressor is maximum

What is the correct answer?

4

The minimum work required for a three stage reciprocating air compressor is ________ the work required for each stage.

A. Equal to

B. Double

C. Three times

D. Six times

What is the correct answer?

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

What is the correct answer?

4

Free air is the air at

A. Atmospheric conditions at any specific location

B. 20°C and 1 kg/cm² and relative humidity of 36%

C. 0°C and standard atmospheric conditions

D. 15°C and 1 kg/cm²