Cut-off ratio is the ratio of
A. Swept volume to the volume at cut-off
B. Volume at cut-off to the clearance volume
C. Volume at cut-off to the swept volume
D. Clearance volume to the volume at cut-off
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The fire tubes in a Cochran boiler are
A. Horizontal
B. Vertical
C. Inclined
D. None of these
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The numbers of fire tubes in a Cochran boiler are
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The three "Ts" for good combustion are
A. Temperature, time, and turbulence
B. Total air, true fuel, and turbulence
C. Thorough mixing, total air and temperature
D. Total air, time, and temperature
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The function of a valve rod is
A. To provide reciprocating motion to the slide valve
B. To convert reciprocating motion of the piston into rotary motion of the crank
C. To convert rotary motion of the crankshaft into to and fro motion of the valve rod
D. To provide simple harmonic motion to the D-slide valve
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In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,
A. Velocity increases
B. Velocity decreases
C. Velocity remains constant
D. Pressure remains constant
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Equivalent evaporation is the amount of water evaporated in a boiler from and at
A. 0°C
B. 100°C
C. Saturation temperature at given pressure
D. Room temperature
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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
A. Internally fired boiler
B. Externally fired boiler
C. Natural circulation boiler
D. Forced circulation boiler
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When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as
A. Internally fired boiler
B. Externally fired boiler
C. Natural circulation boiler
D. Forced circulation boiler
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The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
A. Regenerative heating
B. Reheating of steam
C. Bleeding
D. None of these
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The length of Lancashire boiler varies from
A. 5 to 6 m
B. 6 to 7 m
C. 7.25 to 9 m
D. 9 to 10 m
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The length of Cornish boiler varies from
A. 2 to 4.5 m
B. 3 to 5 m
C. 5 to 7.5 m
D. 7 to 9 m
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The diameter of a cylindrical shell of a Scotch marine boiler varies from
A. 1.5 to 2 m
B. 2.5 to 3.5 m
C. 3.5 to 4.5 m
D. None of these
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The diameter of Cornish boiler varies from
A. 0.5 to 1 m
B. 1 to 2 m
C. 1.25 to 2.5 m
D. 2 to 3 m
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The fusible plug in small boilers is located
A. In the drum
B. In the fire tubes
C. Above steam dome
D. Over the combustion chamber
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During polytropic process
A. Heat transfer takes place across cylinder walls
B. Work is done
C. Steam may be wet, dry or superheated after expansion
D. All of the above
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The amount of water evaporated from feed water at _________ into dry and saturated steam at 100°C at normal atmospheric pressure is called equivalent evaporation from and at 100°C.
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The length of shell of a Locomotive boiler is
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The shell diameter of a Locomotive boiler is
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The diameter of superheated tubes in a locomotive boiler is
A. 13 mm
B. 31 mm
C. 130 mm
D. 230 mm
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