Question:

Aeroderivative engines have pressure ratios

A.

greater than 30

B.

lesser than 30 and greater than 20

C.

greater than 50

D.

none of the mentioned

Answer» a. greater than 30

Question:

If mach number is less than one then its flow is                              

A.

subsonic flow

B.

turbulent flow

C.

laminar flow

D.

none of the mentioned

Answer» a. subsonic flow

Question:

A scooter weighs 120kg f. Brakes are applied so that wheels stop rolling and start skidding. Find the force of friction if the coefficient of friction is 0.4.

A.

60kg f

B.

48kg f

C.

25kg f

D.

32kg f

Answer» b. 48kg f

Question:

What happens due to high temperature of feeds water in the economizer?

A.

fuel consumption increases

B.

fuel mechanical efficiency increases

C.

fuel consumption decreases

D.

fuel mechanical efficiency decreases

Answer» c. fuel consumption decreases

Question:

Which liquid fuel has a wider composition than diesel and used in furnaces of oil fired boiler?

A.

fuel oil

B.

petrol

C.

distillate

D.

alcohol

Answer» a. fuel oil

Question:

The Parsons’ reaction turbine has

A.

only moving blades

B.

only fixed blades

C.

fixed and moving blades of different shape

D.

identical fixed and moving blades

Answer» d. identical fixed and moving blades