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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

Runaway speed of a hydraulic turbine is_________________?
A full load speed
B the speed at which turbine runner will be damaged
C the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
D the speed corresponding to maximum overload permissible
Correct Answer: the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
Medium specific speea of turbine implies it is___________________?
A propeller turbine
B Francis turbine
C impulse turbine
D any one of the above
Correct Answer: Francis turbine
The specific speed of turbine is defined as the speed of a unit___________________?
A of such a size that it delivers unit dis-charge at unit head
B of such a size that it delivers unit dis-charge at unit power
C of such a size that it requires unit power per unit head
D of such a size that it produces unit horse power with unit head
Correct Answer: of such a size that it produces unit horse power with unit head
A turbine pump is basically a centrifugal pump equipped additionally with_________________?
A adjustable blades
B backward curved blades
C vaned diffusion casing
D inlet guide blades
Correct Answer: vaned diffusion casing
In reaction turbine, draft tube is used_____________________?
A to transport water downstream without eddies
B to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
C for safety of turbine
D to increase flow rate
Correct Answer: to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
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
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