Machine Design Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Machine Design ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Machine Design comprehensively.

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121.
A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as___________________?

Wood-ruff key

Feather key

Flat saddle key

Gib head key

122.
A key capable of tilting in a recess milled out in a shaft is known as______________________?

Wood-ruff key

Feather key

Flat saddle key

Gib head key

123.
Buttress threads are usually found on____________________?

Screw cutting lathes

Feed mechanisms

Spindles of bench vices

Screw jack

Railway carriage couplings

124.
Jam nut is a locking device in which _____________________?

One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

A slot is cut partly in middle of nut and then slot reduced by tightening a screw

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

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

125.
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to___________________?

0.2

0.25

0.50

0.6

127.
Rivets are generally specified by_______________?

Thickness of plates to be riveted

Length of rivet

Diameter of head

Nominal diameter

128.
The designation M 33 x 2 of a bolt means___________________?

Metric threads of 33 nos in 2 cm.

Metric threads with cross-section of 33 mm

Metric threads of 33 mm outside diameter and 2 mm pitch

Bolt of 33 mm nominal diameter having 2 threads per cm

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