Which of the following coals has the highest calorific value?
A. Anthracite coal
B. Bituminous coal
C. Lignite
D. Peat
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Which type of boiler can meet rapid changes of load?
A. Vertical fire tube type
B. Horizontal fire tube type
C. Horizontal water tube type
D. Forced circulation type
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Which of the following boiler is best suited to meet the fluctuating demand of steam?
A. Locomotive boiler
B. Lancashire boiler
C. Cornish boiler
D. Babcock and Wilcox boiler
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A nozzle is said to be a divergent nozzle
A. When the cross-section of the nozzle increases continuously from entrance to exit
B. When the cross-section of the nozzle decreases continuously from entrance to exit
C. When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
D. None of the above
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The compounding of turbines is done in order to
A. Reduce speed of rotor
B. Improve efficiency
C. Reduce exit losses
D. All of these
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The function of an eccentric 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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A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly
A. 1.05
B. 2.86
C. 6.65
D. 10.05
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Steam in water tube boiler as compared to fire tube boiler
A. Can be raised rapidly
B. Is raised at slower rate
C. Is raised at same rate
D. Could be raised at fast/slow rate depending on design
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Thermal equilibrium means that the flow of steam is
A. Isothermal
B. Isentropic
C. Hyperbolic
D. Polytropic
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A supercritical boiler is one that operates above the pressure and temperature of following values
A. 100 kg/cm2 and 540°C
B. 1 kg/cm2 and 100°C
C. 218 kg/cm2 abs and 373°C
D. 218 kg/cm2 abs and 540°C
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In forced circulation steam boilers, the force is applied
A. To draw water
B. To circulate water
C. To drain off the water
D. All of these
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Pulverized fuel is used for
A. Better burning
B. More calorific value
C. Less radiation loss
D. Medium sized units
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The fittings mounted on the boiler for its proper and safe functioning is a
A. Water level indicator
B. Pressure gauge
C. Safety valve
D. All of these
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The relative heat absorption for successively added equal areas of boiler convection heating surfaces
A. Increases
B. Decreases
C. Remain unaffected
D. First increases and then decreases
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The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.
A. Same
B. Less
C. More
D. None of these
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Willian's law states that the steam consumption per hour provided with a throttled governor is proportional to (where I .P . = Indicated Power)
A. I .P . 1
B. ( I .P . ) 2 1
C. I .P .
D. ( I .P . ) 2
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Blading efficiency is also known as
A. Stage efficiency
B. Diagram efficiency
C. Nozzle efficiency
D. None of these
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Stage efficiency is also known as
A. Diagram efficiency
B. Nozzle efficiency
C. Gross efficiency
D. None of these
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The behavior of coal in a furnace is determined by
A. The content of sulphur
B. The content of ash and heating value
C. The proximate analysis
D. The exact analysis
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One kilowatt-hour energy is equivalent to
A. 1000 J
B. 360 kJ
C. 3600 kJ
D. 3600 kW/sec
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