In turbo fan engine, the jet velocity as compared to turbojet engine is

A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity

A

One-half

B

One-third

C

Two-third

D

Three-fourth

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

The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is

A

$$\frac{{{\text{wa}}\left( {{\text{V}} - {\text{v}}} \right)}}{{2{\text{g}}}}$$

B

$$\frac{{{\text{wa}}\left( {{\text{V}} - {\text{v}}} \right)}}{{\text{g}}}$$

C

$$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{2{\text{g}}}}$$

D

$$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{\text{g}}}$$

In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

A

Exit nozzle, which is a constant volume process

B

Exit nozzle, which is essentially an isentropic process

C

Turbine blades, which is a constant volume process

D

Turbine blades, which is essentially an isentropic process

The capacity of induced draft fan compared to forced draft fan in a boiler is

A

Same

B

More

C

Less

D

Less or more depending on size of boiler

For the same draught produced the power of induced draught fan as compared to forced draught fan is

A

less

B

more

C

same

D

not predictable

The turbine of the turboprop engine is __________ that of the turbojet engine.

A

Same as

B

Smaller than

C

Bigger than

D

None of these

The maximum propulsive efficiency of a turbojet engine is at a speed of

A

1000 km/h

B

2000 km/h

C

2400 km/h

D

3000 km/h

A simple turbojet engine is basically

A

A propeller system

B

Gas turbine engine equipped with a propulsive nozzle and diffuse

C

Chemical rocket engine

D

Ramjet engine

If a man reduces the selling price of a fan from Tk. 400 to Tk. 380, his loss increases by 2%. The cost price of the fan is:

A

Tk.480

B

Tk.600

C

Tk. 1000

D

Tk. 1060

In turbo fan engine, the jet velocity as compared to turbojet engine is

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