In a Tandem type compound engine, the high pressure and low pressure cylinders
A. Have common piston rod
B. Are set at 90°
C. Have separate piston rods
D. Are set in V-arrangement
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In a receiver type compound engine, the high pressure and low pressure cylinders
A. Have common piston rod
B. Are set at 90°
C. Have separate piston rods
D. Are set in V-arrangement
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In a Woolf type compound engine, the high pressure and low pressure cylinders
A. Have common piston rod
B. Are set at 90°
C. Have separate piston rod
D. Are set in V arrangement
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The specific volume of steam with increase in pressure decreases
A. Linearly
B. Slowly first and then rapidly
C. Rapidly first and then slowly
D. Inversely
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The saturation temperature of steam with increase in pressure increases
A. Linearly
B. Rapidly first and then slowly
C. Slowly first and then rapidly
D. Inversely
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The difference of supersaturated temperature and saturation temperature at that pressure is called
A. Degree of super-saturation
B. Degree of superheat
C. Degree of under-cooling
D. None of these
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The high pressure boiler is one, which produces steam at a pressure more than
A. Atmospheric pressure
B. 5 kg/cm2
C. 10 kg/cm2
D. 7580 kg/cm2
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Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler
A. Increases
B. Decreases
C. Remain unaffected
D. First increases and then decreases
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The safety valve on boiler drum compared to safety valve on superheater is set at
A. Same value
B. Higher value
C. Lower value
D. Lower/higher depending on steam flow
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The crown of the fire box is made hemispherical in order to
A. Give maximum space
B. Give maximum strength
C. Withstand pressure inside boiler
D. Resist intense heat in fire box
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The critical pressure ratio is given by (where p1 = Initial pressure of steam and p2 = Pressure of steam at throat or critical pressure)
A. p 1 × p 2
B. p 2 p 1
C. p 1 p 2
D. p 1 + p 2
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The discharge is __________ at critical pressure.
A. Zero
B. Minimum
C. Maximum
D. None of these
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Fire tube boilers are limited to a maximum working pressure of
A. 0.17 MN/m2
B. 1.7 MN/m2
C. 17 MN/m2
D. 170 MN/m2
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Fire tube boilers are limited to a maximum design working pressure of
A. 1 kg/cm
B. 6 kg/cm
C. 17 kg/cm2
D. 100 kg/cm2
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The ratio of heat utilized to produce steam and the heat liberated in furnace is known as
A. Boiler effectiveness
B. Boiler evaporative capacity
C. Factor of evaporation
D. Boiler efficiency
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In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will
A. Remain unaffected
B. Improve
C. Worsen
D. May improve/worsen depending on size
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When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as
A. Throttle governing
B. Cut-off governing
C. By-pass governing
D. None of these
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In a reaction turbine when the degree of reaction is zero, then there is
A. No heat drop in moving blades
B. No heat drop in fixed blades
C. Maximum heat drop in moving blades
D. Maximum heat drop in fixed blades
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In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p2 ) will be
A. 3.3 bar
B. 5.46 bar
C. 8.2 bar
D. 9.9 bar
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The water tubes in a simple vertical boiler are
A. Horizontal
B. Vertical
C. Inclined
D. None of these
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