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
B. Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Steam temperature remains constant
Steam pressure remains constant
Steam enthalpy remains constant
Steam entropy remains constant
To provide reciprocating motion to the slide valve
To convert reciprocating motion of the piston into rotary motion of the crank
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To provide simple harmonic motion to the D-slide valve
Corrosion
Scale
Carryover
All of the above
Longitudinally
Circumferentially
On dished end
Anywhere
Linearly
Rapidly first and then slowly
Slowly first and then rapidly
Inversely
Locomotive boiler is a water tube boiler
Water tube boilers are internally fired
Lamont boiler is a low pressure water tube boiler
All of the above
Frictional losses
It is not possible to achieve 0°K temperature
Leakage
Non availability of ideal substance
The efficiency of steam turbines is greater than steam engines
A flywheel is a must for steam turbine
The turbine blades do not change the direction of steam issuing from the nozzle
The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
0.1
0.3
0.5
0.8
The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft
The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft
The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft
The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft
100°C
Above dew point temperature of flue gases
Below dew point temperature of flue gases
Less than wet bulb temperature of flue gases
Remain unaffected
Improve
Worsen
May improve/worsen depending on size
Static
Dynamic
Static and dynamic
Neither static nor dynamic
Increase thermal efficiency of boiler
Economise on fuel
Extract heat from the exhaust flue gases
Increase flue gas temperature
21 %
23 %
30 %
40 %
Less efficient and less economical
Less efficient and more economical
More efficient and less economical
More efficient and more economical
I.P. = a × m + b
m = a + b × I.P.
I.P. = b × m + a
m = (b/I.P.) - a
T1 /88.25H
88.25H/T1
T1 /176.5H
176.5H/T1
Have common piston rod
Are set at 90°
Have separate piston rods
Are set in V-arrangement
Cut-off ratio
Expansion ratio
Clearance ratio
None of these
Blow off cock
Fusible plug
Superheater
Stop valve
Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Internally fired boiler
Externally fired boiler
Natural circulation boiler
Forced circulation boiler
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Brake thermal efficiency
0.2
0.8
1.0
0.6
Where low speeds are required
For small power purposes and low speeds
For large power purposes
For small power purposes and high speeds
Wet
Superheated
Remain dry saturated
Dry
Drooping characteristic
Linear characteristic
Rising characteristic
Flat characteristic
When the cross-section of the nozzle increases continuously from entrance to exit
When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
None of the above
10 to 15 %
15 to 20 %
20 to 30 %
30 to 40 %