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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

Impulse turbine is generally fitted______________________?
A at the level of tail race
B little above the tail race
C slightly below the tail race
D about 2.5 m above the tail race to avoid cavitation
Correct Answer: little above the tail race
Francis turbine is best suited for_____________________?
A medium head application from 24 to 180 m
B low head installation up to 30 m
C high head installation above 180 m
D all types of heads
Correct Answer: medium head application from 24 to 180 m
Francis, Kaplan and propeller turbines fall under the category of___________________?
A Impulse turbines
B Reaction turbines
C Axial flow turbines
D Mixed flow turbines
Correct Answer: Reaction turbines
The discharge through a reaction turbine with increase in unit speed____________________?
A increases
B decreases
C remains unaffected
D first increases and then decreases
Correct Answer: decreases
Specific speed for reaction turbines ranges from___________________?
A 0 to 4.5
B 10 to 100
C 80 to 200
D 250 to 300
Correct Answer: 10 to 100
Which place in hydraulic turbine is most susceptible for cavitation __________________?
A inlet of draft rube
B blade inlet
C guide blade
D penstock
Correct Answer: inlet of draft rube
According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies______________________?
A directly as fan speed
B square of fan speed
C cube of fan speed
D square root of fan speed
Correct Answer: directly as fan speed
Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?
A 39.2%
B 49.2%
C 68.8%
D 84.8%
Correct Answer: 84.8%
According to fan laws, for fans having constant wheel diameter, the pressure varies________________?
A directly as fan speed
B square of fan speed
C cube of fan speed
D square root of fan speed
Correct Answer: square of fan speed
Pressure intensifier increases the pressure in proportion to____________________?
A ratio of diameters
B square of ratio of diameters
C inverse ratio of diameters
D square of inverse ratio of diameters
Correct Answer: ratio of diameters
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