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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

The designation M 33 x 2 of a bolt means___________________?
A metric threads of 33 nos in 2 cm.
B metric threads with cross-section of 33 mm
C metric threads of 33 mm outside diameter and 2 mm pitch
D bolt of 33 mm nominal diameter having 2 threads per cm
Correct Answer: metric threads of 33 mm outside diameter and 2 mm pitch
Rivets are generally specified by_______________?
A thickness of plates to be riveted
B length of rivet
C diameter of head
D nominal diameter
Correct Answer: nominal diameter
Which of the following is a permanent fastening ?
A bolts
B keys
C cotters
D rivets
Correct Answer: rivets
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to___________________?
A 0.2
B 0.25
C 0.50
D 0.6
Correct Answer: 0.2
Jam nut is a locking device in which _____________________?
A one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B a slot is cut partly in middle of nut and then slot reduced by tightening a screw
C a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
D through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end
Correct Answer: one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A key capable of tilting in a recess milled out in a shaft is known as______________________?
A wood-ruff key
B feather key
C flat saddle key
D gib head key
Correct Answer: wood-ruff key
A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as___________________?
A wood-ruff key
B feather key
C flat saddle key
D gib head key
Correct Answer: flat saddle key
Turn buckle has____________________?
A right hand threads on bout ends
B left hand threads on both ends
C left hand threads on one end and right hand threads on other end
D no threads
Correct Answer: left hand threads on one end and right hand threads on other end
Elastic nut is a locking device in which__________________?
A one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B a slot is cut partly in middle of nut and then slot reduced by tightening a screw
C hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
D through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end
Correct Answer: hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
If threads on a bolt are left hand, threads on nut will be_____________________?
A right hand with same pitch
B left hand with same pitch
C could be left or right hand
D right hand with fine pitch
Correct Answer: left hand with same pitch
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