ESE ME 2018 Achiever Study Plan: Machine Design Quiz 3 for ESE & GATE ME Exams

Question 1

In case of a multiple disc clutch, if n₁ is the number of discs on the driving shaft and n₂ is the number of discs on the driven shaft, then what is the number of pairs of contact surfaces?

Question 2

The effect of increasing the stiffness of springs of centrifugal clutch is

Question 3

Assertion (A): In design of friction clutches the torque transmission capacity id predicted from the condition of uniform rate of wear of friction plate.
Reason (R):With the use of hard materials for the friction lining there is always perfect geometrical fit between two surfaces and hence pressure distribution over the contact zone is not uniform.

Question 4

In case of design of friction clutches, uniform rate of wear theory is used over uniform pressure. The reasons may be the following:
1) It gives higher frictional torque.
2) It gives lower frictional torque.
3) The intensity of pressure is maximum at the inner radius and minimum at the outer radius of the friction or contact surfaces.
4) This concept is prevalent for running and old clutches.
Which of the above reasons are correct?

Question 5

Which one of the following is correct, when a nut is tightened by placing a washer below it, the bolt will be subjected to _________.

Question 6

Consider the following statements regarding the ends of the pressure vessels flanged by pre-tensioned bolts:
1) Pre-tensioning helps to seal the pressure vessel.
2) Pre-tensioning reduces the maximum tensile stress in the bolts.
3) Pre-tensioning countermands the fatigue life of the bolts.
4) Pre-tensioning helps to reduce the deleterious effect of pressure pulsations in the pressure vessel.
Which of the above statements are correct?

Question 7

While selecting the elements of power transmission with speed reduction, the order of preference based on a minimum cost is

Question 8

an elevator weighing 10000 N attains an upward velocity of 4m/s in 2 seconds with uniform acceleration. Then what is the tension in the wire rope?

Question 9

A bracket (shown in figure) is rigidly mounted on wall using four rivets. Each rivet is 6mm in diameter and has an effective length of 12mm.
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Direct shear stress (in MPa) in the most heavily loaded rivet is

Question 10

A block–brake shown below has a face width of 300 mm and a mean co–efficient of friction of 0.25. For an activating force of 400 N, the braking torque in Nm is
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