Steam & Related Questions (Mechanical Engineering) 8 Online Test

Equivalent evaporation is given by




Where Hs and hw are the specific enthalpy of steam and sensible heat of feed water at the working pressure, and L is the latent heat of steam at 1.0332 kgf/cm2 pressure
The missing quantity per stroke is equal to
Cylinder feed+weight of cushion steam
Cylinder feed+weight of indicated steam
Cylinder feed+weight of indicated steam
Weight of cushion steam+weight of indicated steam
The amount of water evaporated from and 100oC into dry saturated steam at atmospheric pressure is called
Evaporative capacity
Equivalent capacity
Generation factor
Boiler horse power
Which of the followings is a wrong statement?
Saturation curve shows the volume of steam in the cylinder during expansion stoke if the condition of steam is 90% dry
Volume represented by the horizontal distance between the actual expansion curve is called missing quantity
Area between the saturated curve and actual expansion curve represents the work lost per stroke due to missing quantity
Missing quantity is caused by condensation of steam and its leakage past the piston
The saturation curve shows the volume of steam in the cylinder during expansion stroke if the steam is
50% dry
80% dry
90% dry
100% dry
Equivalent evaporation is defined as
Ratio of heat actually used in producing steam to the heat liberated in the furnace
Amount of water evaporated in kg per kg of coal burnt
Evaporation of water from and at100oC into dry saturated steam
Evaporation of 15.653 kg of water per hour from and at100oC
The average value of diagram factor lies between
0.4-0.5
0.5-0.6
0.6-0.75
0.75-0.85
For making a comparison of the relative evaporation capacity of boilers, the feed is supposed to evaporate under the following condition/ conditions
Feed water is supplied to the boiler at 100oC
Evaporation of water into steam takes place at the same temperature of 100oC
The steam raised is just dry and saturated
Evaporation takes place under atmospheric pressure of 1.0332 kgf/cm2
All of the above
Which of the following statements is not applicable to the diagram factor of steam engine? The diagram factor represents the ratio of
Area of actual and hypothetical indicator diagrams
Length of actual and hypothetical indicator diagrams
Mean vertical intercept of actual and hypothetical indicator diagrams
Mean effective pressure of actual and hypothetical indicator diagrams
The output of a boiler is normally stated as
Evaporation capacity in tones of steam that can be produced from and at 100oC
Weight of steam actually produced at rated pressure in tones per hour
Boiler horse power
Weight of steam produced per kg of fuel
Boiler rating is usually defined in terms of
Maximum temperature of steam in degrees Kelvin
Heat transfer rate in kJ/hr
Heat transfer area in m2
Steam output in kg/hr
Which aspect is not true regarding the effect of clearance in a steam engine?
Decrease in efficiency
Increase in work done
Increase in mean effective pressure
No effect on steam consumption
The capacity of a boiler is defined as
Volume of steam space inside the shell
Volume of feed water inside the shell
Amount of water evaporated into steam in a period of one hour
Maximum pressure at which steam can be raised in a boiler
The back pressure of a locomotive steam engine is about
0.8 bar
1.2 bar
1.6 bar
2.0 bar
For the same diameter and thickness of tubes, heating surface area will be
Same for water tube and fire tube boilers
More for a water tube boiler
More for a fire tube boiler
Unpredictable
Description:

This is a 15-question test on ‘Steam: Generation, Engines and Turbines’ under a series of tests of Mechanical Engineering which is attributed to Competitive Examination Preparations e.g. IAS (Optional), GATE, IES etc.

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