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.Management Sciences
Category: Machine Design
A backing ring is used inside the pipe joint when making a___________________?
A. butt weld
B. fillet weld
C. sleeve weld
D. socket weld
E. tube weld
Rankine’s theory of failure is applicable for following type of materials___________________?
A. brittle
B. ductile
C. elastic
D. plastic
E. tough
A self locking screw has________________>
A. fine threads
B. coarse threads
C. coefficient of friction > tangent of load angle
D. hole for inserting split pin
E. two nuts for locking
At low temperatures (say 75°C) the notched-bar impact value of steel____________________?
A. increases markedly
B. decreases markedly
C. remains same
D. depends on heat treatment carried out
E. none of the above
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited ________________?
A. square
B. acme
C. buttress
D. BSW
E. metric
The rated life of a bearing varies___________________?
A. directly as load
B. inversely as square of load
C. inversely as cube of load
D. inversely as fourth power of load
E. none of the above
Buttress threads are usually found on____________________?
A. screw cutting lathes
B. feed mechanisms
C. spindles of bench vices
D. screw jack
E. railway carriage couplings
Plastic flow in ductile materials_____________________?
A. increases the seriousness of static load-ing stress concentration
B. lessens the seriousness of static load¬ing stress concentration
C. has no effect on it
D. depends on other considerations
E. none of the above
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