Steam & Related Questions (Mechanical Engineering) 5 Online Test

In a condensing steam engine, the exhaust pressure is
More than atmospheric pressure
Equal to atmospheric pressure
Less than atmospheric pressure
Depends upon the pressure of supply steam
A double acting steam engine with a cylinder diameter of 20 cm and a stroke of 30 cm has a cut off 0.35. the expansion ratio for the engine is nearly
1.05
2.85
6.65
10.05
A double acting steam engine running at 225 rev/min will complete one stroke in
1/7.5 sec
1/15 sec
1/30 sec
None of the above
For the same length of stroke and speed of crankshaft the piston speed for a double acting steam engine is………the piston speed of a single acting steam engine
Half
Same
Twice
Four times
A locomotive is fitted with a steam engine of the type
Single acting non-condensing
Double acting non-condensing
Single acting condensing
Compound steam engine which may be condensing or non condensing type
Compared to throttle governing, the cut off governing of steam engines is
More efficient and more economical
More efficient and less economical
Less efficient and more economical
Less efficient and less economical
Which aspect is not true in the context of cut off governing of steam engine?
A change in the output of engine is affected by varying the amount of steam supply to the engine
Full use is made of steam pressure
At very large cut off, there is a serious reduction in the expansion period
The rate of steam consumption is directly proportional to the indicated power
Throttle governing of steam engine is a method of controlling the engine output by varying……….of intake steam
Pressure
Volume
Temperature
Dryness fraction
Willian’s line holds good for steam engines governed by
Cut off governing
Throttle governing
By-pass governing
Nozzle control governing
A throttle governed steam engine develops 20 kW indicated power with 281 kg/hr of steam and 50 kW indicated power with 521 kg/hr of stbbeam. The steam consumption in kg/hr when developing 15 kW indicated power will be nearly
150 kg/hr
156 kg/hr
241 kg/hr
290 kg/hr
For maximum discharge of flue gas, the height of the hot gas column producing draught and the height of the chimney conform to the ratio
1:2
1:1
2:1
5:2
Which of the following statements is not true with respect to Mollier-diagram?
The inclination of constant pressure lines equals the absolute temperature
The constant pressure lines bend slightly downward in the super heated region
The expansion process through a turbine is represented by a vertical line parallel to the ordinate
The diagram helps to readily find out the total heat content of a steam of specified pressure and quality
Willian’s line for the steam engine is expressed mathematically as
W=P+C
P=W+C
W=
W=P-C
Where W is steam consumption per hour, Pis the indicated power, m and C area constant factors
Willian’s line for the steam engine is a straight line relationship between rate of steam consumption and
Brake power
Indicated power
Pressure of steam
Efficiency
What forms the connection between piston rod and connecting rod?
Eccentric
Crankshaft
Cross head
Valve rod
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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