Steam Boilers, Engines, Nozzles And Turbines MCQ Questions & Answers | Mechanical Engineering

A. The expansion of steam in a nozzle follows Rankine cycle

B. The friction in the nozzle increases the dryness fraction of steam

C. The pressure of steam at throat is called critical pressure

D. All of the above

A. A horizontal steam engine requires less floor area than a vertical steam engine

B. The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure

C. The compound steam engines are generally non-condensing steam engines

D. All of the above

A. Lancashire boiler is a fire tube boiler

B. Fire tube boilers are internally fired

C. Babcock and Wilcox boiler is a water tube boiler

D. All of the above

A. A fire tube boiler occupies less space than a water tube boiler, for a given power

B. Steam at a high pressure and in large quantities can be produced with a simple vertical boiler

C. A simple vertical boiler has one fire tube

D. All of the above

A. Work done during the Rankine cycle

B. Work done during compression

C. Work done during adiabatic expansion

D. Change in enthalpy

A. All the fuel burns instantaneously producing high energy release

B. Fuel burns with less air

C. Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

D. Explosion in furnace

A. ps - pa

B. pa - ps

C. pa + ps

D. None of these

A. Barometric pressure + actual pressure

B. Barometric pressure - actual pressure

C. Gauge pressure + atmospheric pressure

D. Gauge pressure - atmospheric pressure

A. 0.007 bar

B. 0.053 bar

C. 0.06 bar

D. 0.067 bar

A. Dry

B. Wet

C. Saturated

D. Supersaturated