Mechanical Engineering MCQs

2075 MCQs  (Page 12 of 208)

Attempt Mechanical Engineering Mcqs Quiz
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?
A. Remain same
B. Decrease
C. Increase
D. Unpredictable
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The ideal efficiency of simple gas turbine cycle depends on________________?
A. Pressure ratio
B. Maximum cycle temperature
C. Minimum cycle temperature
D. All of the above
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The material commonly used for air craft gas turbine is__________________?
A. Stainless steel
B. High alloy’ steel
C. Duralumin
D. Timken, haste and inconel allpys
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The jnaximum combustion pressure in gas turbine as compared to I.C. engine is_________________?
A. More
B. Less
C. Same
D. Depends on other factors
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As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?
A. Increases
B. Decreases
C. Remains same
D. First increases and then decreases
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It is not possible to use closed gas turbine cycle in aeronautical engines because_________________ ?
A. It is inefficient
B. It is bulky
C. It requires cooling water for its operation
D. Non of theses
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For an irreversible gas turbine cycle, the efficiency and work ratio both depend on___________________?
A. Pressure ratio alone
B. Maximum cycle temperature alone
C. Minimum cycle temperature alone
D. Both pressure ratio and maximum cycle temperature
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Producer gas is produced by_____________________?
A. Carbonisation of coal
B. Passing steam over incandescent coke
C. Passing air and a large amount of steam over waste coal at about 65°c
D. Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
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A gas turbine used in air craft should have______________________?
A. High h.p. and low weight
B. Low weight and small frontal area
C. Small frontal area and high h.p.
D. High speed and high h.p.
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The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the_____________________?
A. Adiabatic temperature drop in the stage
B. Total temperature drop
C. Total temperature drop in the stage
D. Total adiabaitc temperature drop
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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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