A double start screw has
A.Two threads per inch
B.Fine threads
C.Coarse threads
D.Two threads at some phase angle
E.None of the above
Category: Machine Design Mcqs
The casing of a water pump is generally
A.Made of soft material
B.Made of hard material
C.Made of chilled cast iron for water resistance
D.Made of non-ferrous materials
E.None of the above
If during operation of a boiler one of the riveted joints is found leaking
A.The boiler is stopped immediately
B.All the riveted joints are reopened and gain riveted
C.Depending upon the zone of boiler in which the joint leaks, decision is taken
D.The joint is repaired if in low pressure zones otherwise boiler sent for repairs
E.None of the above
The diameter of a washer is generally
A.Equal to the diameter of bolt
B.Slightly less than the diameter of the bolt
C.Slight more than the diameter of the bolt
D.Of any size that suits the application
E.None of the above
If during operation a boiler bursts, the matter should be reported to
A.Management
B.Police
C.State Government
D.Central Government
E.Boiler inspector
M 10 secrews have a pitch of
A.0.5 mm
B.1.25 mm
C.2.50 mm
D.5.00 mm
E.10 mm
A foundation bolt with a circular end is secured to the floor by means of a steel cotter. If the pull on the bolt is 14000 kg, the diameter of the bolt should be
A.10 mm
B.20 mm
C.30 mm
D.50 mm
E.Double shear
Resilience of material should be considered when it is subjected to
A.Fluctuating load
B.Wear and tear
C.Shock loading
D.Any of the above
E.None of the above
Self-tapping screws are generally used in
A.Shear metal work
B.Machine tools
C.Automobiles
D.Aeroplanes
E.None of the above
In flange coupling the weakest element should be
A.Flange
B.Bolts
C.Bolt bush
D.Shaft
E.Key
