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Mechanical Engineering
Steam Boilers
Quiz 2
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Q.1
Fire tube boilers are
internally fired
externally fired
internally as well as externally fired
none of these
Q.2
An economiser __________ the steam raising capacity of a boiler.
increases
decreases
has no effect on
Both A & B
Q.3
A device used to increase the temperature of saturated steam without raising its pressure, is called
blow off cock
fusible plug
superheater
stop valve
Q.4
The diameter of flue tube in a Cornish boiler is __________ that of the shell.
one-fourth
one-third
two-fifth
three-fifth
Q.5
A draught produced by a chimney due to the difference of densities between the hot gases inside the chimney and cold atmospheric air outside it, is called natural draught.
Yes
No
Q.6
The temperature of condensate is __________ on leaving the condenser than that of circulating water at inlet.
higher
lower
Q.7
Willian's line for the steam engine is a straight line relationship between the steam consumption per hour and
indicated power
brake power
efficiency
pressure of steam
Q.8
The natural draught is produced by
steam jet
centrifugal fan
chimney
both (a) and (b)
Q.9
When the speed of the crankshaft is betweenr.p.m. andr.p.m., the engine said to be a
slow speed engine
medium speed steam engine
high speed steam engine
none of these
Q.10
Which of the following statement is correct for a compound steam engine ?
The cost of the engine, for the same power and economy, is more than that of a simple steam engine.
The forces in the working parts are increased as the forces are distributed over more parts.
The ratio of expansion is reduced, thus reducing the length of stroke.
The temperature range per cylinder is increased, with corresponding increase in condensation.
Q.11
The function of a connecting rod is not to convert reciprocating motion of the piston into rotary motion.
True
False
Q.12
La-mont boiler, is a high pressure water tube steam boiler working on forced circulation.
Agree
Disagree
Q.13
Loeffler boiler is a water tube boiler using a forced circulation of water.
True
False
Q.14
In water tube boilers
water passes through the tubes which are surrounded by flames and hot gases
the flames and hot gases pass through the tubes which are surrounded by water
forced circulation takes place
none of these
Q.15
In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to
water space also
chimney
steam space
superheater
Q.16
A grate, in a boiler, is a place in the combustion chamber upon which fuel (wood or coal) is burnt.
True
False
Q.17
The reheat factor is the ratio of the
Cumulative heat drop to the isentropic heat drop
Isentropic heat drop to the heat supplied
Total useful heat drop to the total isentropic heat drop
None of the above
Q.18
Duplex feed pumps are used in small steam boilers. These operate on the principle of
Centrifugal pump
Axial flow pump
Gear pump
Reciprocating pump
Q.19
In a boiler, the heat is lost
To dry flue gases
In moisture present in the fuel
To steam formed by combustion of hydrogen per kg of fuel
All of the above
Q.20
The friction present between the steam and the nozzle surfaces reduces the heat drop by
10 to 15%
15 to 25%
25 to 40%
40 to 60%
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