The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
A. Remains constant
B. Decreases
C. Increases
D. None of these
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A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called
A. Receiver type compound engine
B. Tandem type compound engine
C. Woolf type compound engine
D. None of these
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Pick up the wrong statement about critical condition of steam
A. Latent heat is zero
B. Liquid directly becomes steam
C. Specific volume of steam and liquid is same
D. This is the maximum pressure limit
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Parson's turbine is a
A. Simple impulse turbine
B. Simple reaction turbine
C. Impulse-reaction turbine
D. None of these
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When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.
A. Increases
B. Decreases
C. Remain same
D. None of these
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Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value
A. (1- moisture content)
B. (1 + moisture content)
C. 1 + moisture content
D. 1 – moisture content
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Locomotive boiler is a
A. Single tube, horizontal, internally fired and stationary boiler
B. Single tube, vertical, externally fired and stationary boiler
C. Multi-tubular, horizontal, internally fired and mobile boiler
D. Multi-tubular, horizontal, externally fired and stationary boiler
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Throttle governing of steam engines is a method of controlling the engine output by varying
A. Volume of intake steam
B. Pressure of intake steam
C. Temperature of intake steam
D. All of these
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Cut-off governing of steam engines is a method of controlling the engine output by varying
A. Volume of intake steam
B. Pressure of intake steam
C. Temperature of intake steam
D. All of these
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Lancashire boiler is used where working pressure and power required are
A. Low
B. Moderate
C. High
D. None of these
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The stage efficiency (η S ) is given by (where η B = Blading efficiency and η N = Nozzle efficiency)
A. η S = η B × η N
B. η S = η N η B
C. η S = η B η N
D. None of these
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The dry saturated steam at very low pressure, (510 kg/cm2 ) when throttled to atmosphere will become
A. Wet
B. Superheated
C. Remain dry saturated
D. Dry
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The dry saturated steam at very high pressure (150 - 200 kg/cm2 ) when throttled to atmosphere will become
A. Wet
B. Superheated
C. Remain dry saturated
D. Dry
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Reheating of steam under ideal conditions takes place at constant
A. Entropy
B. Enthalpy
C. Pressure
D. Temperature
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A binary vapor plant consists of
A. Steam turbine
B. Steam condenser
C. Mercury boiler
D. All of these
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Feed water conditioning in thermal power plants in done to
A. Reduce hardness and for removal of solids
B. Increase efficiency of thermal power plant
C. Increase heat transfer rate
D. Increase steam parameters
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The density of supersaturated steam is about __________ that of the ordinary saturated vapor at the corresponding pressure.
A. Same as
B. 2 times
C. 4 times
D. 8 times
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A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as
A. Superheater
B. Air-preheater
C. Economizer
D. Injector
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The ratio of brake power to the indicated power is known as
A. Mechanical efficiency
B. Overall efficiency
C. Indicated thermal efficiency
D. Brake thermal efficiency
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The ratio of the isentropic heat drop to the heat supplied, is called
A. Reheat factor
B. Stage efficiency
C. Internal efficiency
D. Rankine efficiency
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