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

Question:

The ratio of the useful heat drop to the isentropic heat drop is called                          

A.

condenser efficiency

B.

nozzle efficiency

C.

vacuum efficiency

D.

boiler efficiency

Answer» b. nozzle efficiency

Question:

Lithium bromide-water vapour is another absorption refrigeration system.

A.

true

B.

false

Answer» a. true

Question:

Which turbines are employed for driving alternator at synchronous speed?

A.

central station turbine

B.

reheating turbine

C.

extraction turbine

D.

extraction induction turbine

Answer» a. central station turbine

Question:

Which among the following is an assumption of the compressible flow?

A.

resistance to flow of object

B.

no-slip condition

C.

known mass flow rate

D.

resistance to flow of heat

Answer» b. no-slip condition

Question:

Which of the following is not a type of steam turbine?

A.

impulse turbine

B.

reaction turbine

C.

pelton wheel turbine

D.

axial flow type turbine

Answer» c. pelton wheel turbine

Question:

The expansion process is

A.

isentropic

B.

reversible

C.

adiabatic

D.

all of the mentioned

Answer» c. adiabatic

Question:

What is the function of safety valves in the boiler?

A.

to prevent excessive steam pressure

B.

to prevent excessive air pressure

C.

to prevent water pressure

D.

to prevent from rising temperatures

Answer» a. to prevent excessive steam pressure