Machine Design - Practice Test

[#241] The ratio of driving tensions in V-belt drives is __________ flat belt drives.

(A) Equal to

(B) sin$$,alpha $$ times more than

(C) sin$$,alpha $$ times less than

(D) cosec$$,alpha $$ times more than

Correct Answer

(D) cosec$$,alpha $$ times more than

[#242] Which of the following is an anti-friction bearing?

(A) Journal bearing

(B) Pedestal bearing

(C) Collar bearing

(D) Needle bearing

Correct Answer

(D) Needle bearing

[#243] The anti-friction bearings

(A) Have low starting and low running friction at moderate speeds

(B) Have high initial cost

(C) Can carry both radial and thrust loads

(D) All of these

Correct Answer

(D) All of these

[#244] 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 fibre 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

(C) Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip

[#245] 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 fibre 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

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

Machine Design - Study Mode

[#241] The ratio of driving tensions in V-belt drives is __________ flat belt drives.

Correct Answer

[#242] Which of the following is an anti-friction bearing?

Correct Answer

[#243] The anti-friction bearings

Correct Answer

[#244] Elastic nut is a locking device in which

Correct Answer

[#245] Jam nut is a locking device in which

Correct Answer