Questions
3
The bearings of heavy series have capacity __________ over the medium series.
Answer: 20 to 30%
6
Which of the following statement is wrong ?
Answer: The V-belt drive is used with large centre distance
7
Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that
Answer: shaft B is better than shaft A
8
The load cup of a screw jack is made separate from the head of the spindle to
Answer: prevent the rotation of load being lifted
9
The resistance to fatigue of a material is measured by
Answer: endurance limit
10
Stress concentration is caused due to
Answer: abrupt change of cross-section
11
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)
Answer: between 20 d and 30 d
12
Which of the following statement is correct for gears?
Answer: all of the above
13
In a hydrodynamic lubricated bearing
Answer: there is a thick film of lubricant between the journal and the bearing
14
Surface endurance limit of gear material is dependent upon its
Answer: brinell hardness number
15
The pipe joint mostly used for pipes carrying water at low pressures is
Answer: socket joint
16
The constant factor in case of R10 series of preferred numbers is
Answer: 1.26
17
In unilateral system of tolerance, the tolerance is allowed on
Answer: one side of the nominal size
18
An open belt drive is used when
Answer: shafts are arranged parallel and rotate in the same directions
19
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the
Answer: thread
20
Which of the following material has the maximum ductility?
Answer: Mild steel
