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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

Ram compression in turbojet involves____________________?
A reduction of speed of incoming air and conversion of part of it into pressure energy
B compression of inlet air
C increasing speed of incoming air
D lost work
Correct Answer: reduction of speed of incoming air and conversion of part of it into pressure energy
The power available for take off and climb in case of turbojet engine as compared to reciprocating engine is ___________________?
A less
B more
C same
D may be less or more depending on ambient conditons
Correct Answer: less
Intercooling in gas turbine results in ____________________ ?
A increase in net output but decrease in thermal efficiency
B increase in thermal efficiency but decrease in net output
C increase in both thermal efficiency and net output
D decrease in both thermal efficiency and net output
Correct Answer: increase in net output but decrease in thermal efficiency
If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?
A isothermal
B isentropic
C adiabatic
D isochoric
Correct Answer: isothermal
In jet engines, paraffin is usually used as the fuel because of its _________________?
A high calorific value
B ease of atomisation
C low freezing point
D A. and C. above
Correct Answer: A. and C. above
Turbo propeller has the following additional feature over the turbojet __________________?
A peopeller
B diffuser
C intercooler
D turbine and combustion chamber
Correct Answer: peopeller
In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of__________________?
A vacuum
B atmospheric air
C compressed air
D oxygen alone
Correct Answer: compressed air
In gas turbines^ high thermal efficiency is obtained in_________________?
A closed cycle
B open cycle
C both of the above
D closed/open depending on other con-siderations
Correct Answer: closed cycle
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
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