Mechanical Engineering MCQs

2075 MCQs  (Page 6 of 208)

Attempt Mechanical Engineering Mcqs Quiz
To aviod moisture troubles, the compressed air main line should __________________?
A. Rise gradually towards the point of use
B. Drop gradually towards the point of use
C. Be laid vertically
D. Be laid exactly horizontally
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To avoid moisture troubles, the branch connections from compressed air lines should be taken from_________________?
A. Top side of main
B. Bottom side of main
C. Left side of main
D. Right side of main
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For a compressor, least work will be done if the compression is________________ ?
A. Isentropic
B. Isothermal
C. Polytropic
D. Somewhere in between isentropic and isothermal
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The compressor efficiecny is the__________________?
A. Isothermal h.p/indicated h.r
B. Isothermal h.p./shaft h.r
C. Total output/air input
D. Compression work/motor input
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For slow-speed large capacity compressor, following type of valve will be best suited________________?
A. Poppet valve
B. Mechanical valve of the corliss, sleeve, rotary or semirotary type
C. Disc or feather type
D. Any of the above
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The volumetirc efficiency of a compressor is calculated on the basis of __________________?
A. Volume of air inhaled at working conditions
B. Volume of air inhaled at n.t.p. conditions
C. Volume at 0°c and 1 kg/cm2
D. Volume at 20°c and 1 kg/cm2
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During base load operation, the best method of controlling compressor is ___________________?
A. Start-stop motor
B. Constant speed unloader
C. Relief valve
D. Variable speed
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The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?
A. 0.1%
B. 0.5%
C. 1.0%
D. 5%
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In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to ____________________?
A. N.t.p. conditions
B. Intake temperature and pressure conditions
C. 0°c and 1 kg/cm2
D. 20°c and 1 kg/cm2
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The advantage of multistage compression over single stage compression is ________________?
A. lower power consumption per unit of air delivered
B. higher volumetric efficiency
C. decreased discharge temperature
D. mositure free air
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Word of the Day
27 Sep
Undesirable
not wanted or desirable because harmful, objectionable, or unpleasant.
غیر مطلوب، ناروا، نامناسب

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