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Steam Boilers, Engines, Nozzles & Turbines MCQ - Multiple Choice Question and Answer

Steam Boilers, Engines, Nozzles & Turbines MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 1
The steam enters the nozzle at a

High pressure and a low velocity
High pressure and a high velocity
Low pressure and a low velocity
Low pressure and a high velocity

Question No : 2
A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

79 m/s
188 m/s
450 m/s
900 m/s

Question No : 3
Desecration of feed water is carried out because it reduces

Cavitation of boiler feed pumps
Corrosion caused by oxygen
Heat transfer coefficient
pH value of water

Question No : 4
An economiser is generally placed between

Last superheater or reheater and air preheater
Induced draft fan and forced draft fan
Air preheater and chimney
None of the above

Question No : 5
The relative efficiency is defined as the

Ratio of thermal efficiency to Rankine efficiency
Ratio of brake power to the indicated power
Ratio of heat equivalent to indicated power to the energy supplied in steam
Product of thermal efficiency and Rankine efficiency

Question No : 6
In locomotive boiler, maximum steam pressure is limited to

1 kg/cm²
5 kg/cm²
10 kg/cm²
18 kg/cm²

Question No : 7
The draught in locomotive boilers is produced by a

Chimney
Centrifugal fan
Steam jet
None of these