the ratio of heat actually used in producing the steam to the heat liberated in the furnace
the amount of water evaporated or steam produced in kg per kg of fuel burnt
the amount of water evaporated from and at 100° C into dry and saturated steam
the evaporation of 15.653 kg of water per hour from and at 100° C
Q.2.
The effect of wire drawing is to decrease the area of indicator diagram and thus work done by the engine is reduced.
Agree
Disagree
Q.3.
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
Q.4.
In a boiler, feed water supplied per hour iskg while coal fired per hour iskg. The net enthalpy rise per kg of water iskJ. If the calorific valve of the coal iskJ/kg, then the boiler efficiency will be
56%
63%
74%
78%
Q.5.
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
Q.6.
In natural circulation steam boilers, the circulation of water is by convection currents which are set up during the heating of water.
Correct
Incorrect
Q.7.
The diameter of Cornish boiler varies from
0.5 to 1 m
1 to 2 m
1.25 to 2.5 m
2 to 3 m
Q.8.
The aim of a compound steam engine is
to reduce the ratio of expansion in each cylinder
to reduce the length of stroke
to reduce the temperature range in each cylinder
all of the above
Q.9.
The fire tubes in a Cochran boiler are
horizontal
vertical
inclined
All of above
Q.10.
In a reciprocating steam engine, the heat energy in the steam is converted into mechanical work by the to and fro motion of the piston.
Agree
Disagree
Q.11.
When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as
internally fired boiler
externally fired boiler
natural circulation boiler
forced circulation boiler
Q.12.
The function of a safety valve is
to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
to indicate the water level inside the boiler to an observer
to measure pressure of steam inside the steam boiler
none of the above
Q.13.
The fire tubes in a Scotch marine boiler are
horizontal
vertical
inclined
None of these
Q.14.
The shell diameter of a Locomotive boiler is
1 m
1.5 m
2 m
2.5 m
Q.15.
The length of shell of a Locomotive boiler is
1 m
2 m
3 m
4 m
Q.16.
An air preheater is installed
before the economiser
before the superheater
between the economiser and chimney
none of these
Q.17.
The function of a piston rod 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
to exhust steam from the cylinder at proper moment
Q.18.
The cylinder dimensions of a compound engine may be designed on the basis of
equal power developed in each cylinder for uniform turning moment
equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
equal temperature drop in each cylinder for economy of steam
all of the above
Q.19.
The function of a crosshead is to guide motion of the __________ and to prevent it from bending.
piston rod
connecting rod
eccentric rod
valve rod
Q.20.
The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called
induced steam jet draught
chimney draught
forced steam jet draught
none of these
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