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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

In the axial flow gas turbine, the work ratio is the ratio of____________________?
A compressor work and turbine work
B output and input
C actual total head tempeature drop to the isentrpic total head drop from total head inlet to static head outlet
D actual compressor work and theoretical comprssor work
Correct Answer: actual total head tempeature drop to the isentrpic total head drop from total head inlet to static head outlet
Water is injected in gas turbine cycle to___________________?
A control temperature
B control output of turbine
C control fire hazards
D increase efficiency
Correct Answer: control output of turbine
The closed cycle in gas turbines_________________?
A provides greater flexibility
B provides lesser flexibility
C in never used
D is used when gas is to be burnt
Correct Answer: provides greater flexibility
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
Correct Answer: total temperature drop
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.
Correct Answer: low weight and small frontal area
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
Correct Answer: partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
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
Correct Answer: both pressure ratio and maximum cycle temperature
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
Correct Answer: it requires cooling water for its operation
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
Correct Answer: increases
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
Correct Answer: less
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