Steam Boilers and Engines - Section 1

Directions to Solve

Steam Boilers and Engines - Section 1

1.

Which of the following boiler is best suited to meet the fluctuating demand of steam ?

A.	Locomotive boiler
B.	Lancashire boiler
C.	Cornish boiler
D.	Babcock and Wilcox boiler

Answer: Option A

Explanation:

No answer description available for this question.

2.

A safety valve mainly used with locomotive and marine boilers is

A.	lever safety valve
B.	dead weight safety valve
C.	high steam and low water safety valve
D.	spring loaded safety valve

Answer: Option D

Explanation:

No answer description available for this question.

3.

In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

A.	56%
B.	63%
C.	74%
D.	78%

Answer: Option B

Explanation:

No answer description available for this question.

4.

Cut-off governing of steam engines is a method of controlling the engine output by varying

A.	volume of intake steam
B.	pressure of intake steam
C.	temperature of intake steam
D.	all of these

Answer: Option A

Explanation:

No answer description available for this question.

5.

In natural circulation steam boilers, the circulation of water is by convection currents which are set up during the heating of water.

A.	Correct
B.	Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

6.

The rate of steam produced in Benson boiler is

A.	100 tonnes/h
B.	135 tonnes/h
C.	175 tonnes/h
D.	250 tonnes/h

Answer: Option B

Explanation:

No answer description available for this question.

7.

The function of a flywheel is

A.	to convert reciprocating motion of the piston into rotary motion.
B.	to convert rotary motion of the crankshaft into to and fro motion of the valve rod
C.	to prevent fluctuation of speed
D.	to keep the engine speed uniform at all load conditions

Answer: Option C

Explanation:

No answer description available for this question.

8.

The pressure of steam in the engine cylinder at the beginning of the stroke is __________ the boiler pressure.

A.	equal to
B.	less than
C.	higher than

Answer: Option B

Explanation:

No answer description available for this question.

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