Online Mechanical Engineering Test - Steam Boilers and Engines Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Fire tube boilers are

internally fired

externally fired

internally as well as externally fired

none of these

[#]

The fire tubes in a Scotch marine boiler are

horizontal

vertical

inclined

[#]

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

Locomotive boiler

Lancashire boiler

Cornish boiler

Babcock and Wilcox boiler

[#]

Which of the following statement is correct ?

Lancashire boiler is a fire tube boiler.

Fire tube boilers are internally fired.

Babcock and Wilcox boiler is a water tube boiler.

all of the above

[#]

A safety valve mainly used with locomotive and marine boilers is

lever safety valve

dead weight safety valve

high steam and low water safety valve

spring loaded safety valve

[#]

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

volume of intake steam

pressure of intake steam

temperature of intake steam

all of these

[#]

A compound steam engine requires a heavier flywheel than simple steam engines.

True

False

[#]

Cut-off governing as compared to throttle governing is

less efficient and less economical

less efficient and more economical

more efficient and less economical

more efficient and more economical

[#]

Blow off cock in a boiler is used to

control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

increase the temperature of saturated steam without raising its pressure

[#]

10.

A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

blow off cock

fusible plug

superheater

stop valve

[#]

11.

The amount of water evaporated or steam produced in kg per kg of fuel burnt is termed as evaporative capacity of a boiler.

Agree

Disagree

[#]

12.

The function of an eccentric is to provide __________ motion to the slide valve.

reciprocating

rotary

[#]

13.

The clearance in the engine cylinder

increases the mean effective pressure

increases the workdone

decreases the efficiency of the engine

all of these

[#]

14.

When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

internally fired boiler

externally fired boiler

natural circulation boiler

forced circulation boiler

[#]

15.

Which of the following are boiler accessories ?

economiser

superheater

both (a) and (b)

none of these

[#]

16.

The amount of water evaporated in kg per kg of fuel burnt is called

evaporative capacity of a boiler

equivalent evaporation from and at 100° C

boiler efficiency

none of these

[#]

17.

The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height ot the chimney in metres, and T₁ = Absolute temperature of air outside the chimney in K)

[#]

18.

Water tube boilers are

internally fired

externally fired

internally as well as externally fired

none of these

[#]

19.

The function of a piston in a steam engine is

to guide motion of the piston rod and to prevent it from bending

to transfer motion from the piston to the cross-head

to convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

[#]

20.

In a Woolf type compound engine, the high pressure and low pressure cylinders

have common piston rod

are set at 90°

have separate piston rod

are set in V - arrangement

[#]

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Online Mechanical Engineering Test - Steam Boilers and Engines Test

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