Related Questions
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4
For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.
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4
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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4
In forced circulation steam boilers, the force is applied
C. To drain off the water
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4
In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be
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4
Thermal efficiency of well maintained boiler will be of the order
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4
Water and sediment in fuel oil can be removed by
A. Heating the oil in the settling tanks
B. Cooling the oil in the settling tanks
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4
The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by
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4
In a nozzle, the effect of super-saturation is to
A. Decrease dryness fraction of steam
B. Decrease specific volume of steam
D. Increase the heat drop
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4
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
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The diameter of Cornish boiler is of the order of
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The high steam and low water safety valve is used to blow off steam when the
A. Steam pressure exceeds the working pressure
B. Water level in the boiler becomes too low
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4
For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be
A. One-half the height of chimney
B. Equal to the height of chimney
C. Two times the height of chimney
D. Four times the height of chimney
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4
In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is
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4
Which of the following is a fire tube boiler?
B. Babcock and Wilcox boiler
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4
In order to reduce the rotor speed of an impulse turbine, the method employed is
C. Pressure-velocity compounding
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A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
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4
A valve installed between the boiler and the feed pump is
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4
Stoichiometric quantity of air is the
A. Air present in atmosphere at NTP conditions
B. Air required for complete combustion of fuel with no excess air
C. Air required for optimum combustion so as to have reasonable excess air
D. Air required to convert CO into CO₂
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4
The diameter of Cornish boiler varies from
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Which of the following coals has the highest calorific value?
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Which of the following substance will have same percentage in both proximate and ultimate analysis?
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4
The crown of the fire box is made hemispherical in order to
C. Withstand pressure inside boiler
D. Resist intense heat in fire box
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4
The principal function of a stop valve is to
A. Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
B. Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
C. Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
D. Increase the temperature of saturated steam without raising its pressure
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4
The latent heat of steam with increase of pressure
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The length of shell of a Locomotive boiler is
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4
The selection of type and size of a steam boiler depends upon
A. The power required and working pressure
B. The geographical position of the power house
C. The fuel and water available
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The natural draught is produced by
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Which of the following gases has the highest calorific value?
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The pressure of reheat steam after passing through reheater compared to inlet condition is
D. May be more or less depending on capacity of reheater
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O₂ content in atmospheric air on volume basis is