Home
Current Affairs January 2024

What is the correct answer?

4

A jet engine has

A. No propeller

B. Propeller in front

C. Propeller at back

D. Propeller on the top

Correct Answer :

A. No propeller


Related Questions

What is the correct answer?

4

As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio

A. Increases

B. Decreases

C. Remain same

D. First increases and then decreases

What is the correct answer?

4

Isothermal compression though most efficient, but is not practicable because

A. It requires very big cylinder

B. It does not increase pressure much

C. It is impossible in practice

D. Compressor has to run at very slow speed to achieve it

What is the correct answer?

4

With the decrease in compression ratio, the volumetric efficiency

A. Does not change

B. Increases

C. Decreases

D. First decrease and then increase

What is the correct answer?

4

The ratio of workdone per cycle to the stroke volume of the compressor is known as

A. Compressor capacity

B. Compression ratio

C. Compressor efficiency

D. Mean effective pressure

What is the correct answer?

4

The assumption made in two stage compression with intercooler is that

A. There is no pressure drop in the intercooler

B. The compression in both the cylinders is polytropic

C. The suction and delivery of air takes place at constant pressure

D. All of the above

What is the correct answer?

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

What is the correct answer?

4

The volumetric efficiency of a compressor

A. Increases with decrease in compression ratio

B. Decreases with decrease in compression ratio

C. Increases with increase in compression ratio

D. Decreases with increase in compression ratio

What is the correct answer?

4

Pick up the wrong statement about advantages of multistage compression

A. Better lubrication is possible advantages of multistage

B. More loss of air due to leakage past the cylinder

C. Mechanical balance is better

D. Air can be cooled perfectly in between

What is the correct answer?

4

The type of rotary compressor used in gas turbines, is of

A. Centrifugal type

B. Axial flow type

C. Radial flow type

D. None of these

What is the correct answer?

4

Isothermal compression efficiency can be attained by running the compressor

A. At very high speed

B. At very slow speed

C. At average speed

D. At zero speed

What is the correct answer?

4

Standard air is the air at ________ and relative humidity of 36 percent.

A. 0.1 bar and 20°C

B. 1 bar and 20°C

C. 0.1 bar and 40°C

D. 1 bar and 40°C

What is the correct answer?

4

The weight per horse power ratio for gas in Turbine as compared to I.C. engine and steam turbine is

A. Same

B. Higher

C. Lower

D. None of these

What is the correct answer?

4

The power available for takeoff and climb in case of turbojet engine as compared to reciprocating engine is

A. Less

B. More

C. Same

D. May be less or more depending on ambient conditions

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

What is the correct answer?

4

The overall isothermal efficiency of the compressor is defined as the ratio of

A. Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio

B. Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor

C. Volume of free air delivery per stroke to the swept volume of the piston

D. Isentropic power to the power required to drive the compressor

What is the correct answer?

4

Work ratio of a gas turbine may be improved by

A. Decreasing the compression work

B. Increasing the compression work

C. Increasing the turbine work

D. Both (A) and (C) above

What is the correct answer?

4

Gas turbines for power generation are normally used

A. To supply base load requirements

B. To supply peak load requirements

C. To enable start thermal power plant

D. In emergency

What is the correct answer?

4

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called

A. Slip factor

B. Velocity factor

C. Velocity coefficient

D. None of the above

What is the correct answer?

4

The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is

A. Less

B. More

C. Same

D. More/less depending on compressor capacity

What is the correct answer?

4

The efficiency of roots blower ________ with the increase in pressure ratio.

A. Decreases

B. Increases

C. Does not change

D. None of these

What is the correct answer?

4

The reason for volumetric efficiency of reciprocating compressor being less than 100 percent is

A. Pressure drop across the valves

B. Superheating in compressor

C. Clearance volume and leakages

D. All of these

What is the correct answer?

4

The main purpose of reheating in gas turbine is to

A. Increase temperature

B. Reduce turbine size

C. Increase power output

D. Increase speed

What is the correct answer?

4

Air-fuel ratio in a jet engine will be of the order of

A. 10 : 1

B. 15 : 1

C. 20 : 1

D. 60 : 1

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

Maximum delivery pressure is a rotary air compressor is of the order of

A. 6 kg/cm²

B. 10 kg/cm²

C. 16 kg/cm²

D. 25 kg/cm²

What is the correct answer?

4

The following property is most important for material used for gas turbine blade

A. Toughness

B. Fatigue

C. Creep

D. Corrosion resistance

What is the correct answer?

4

Mechanical efficiency of gas turbines as compared to I.C engines is

A. Higher

B. Lower

C. Same

D. None of the above

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

Efficiency of gas turbine is increased by

A. Reheating

B. Inter cooling

C. Adding a regenerator

D. All of the above

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