ESE ME 2019: Machine Design Quiz-1 for ESE & GATE ME Exams

Question 1

If the load on a ball bearing is reduced to one third, then its life would increase by:

Question 2

Considering the following statements:
In the case of gears of involute profiles, increase in the centre to centre distance between the mounting shafts
1) increases the pressure angle
2) will not affect the law of gearing
3) shortens the path of contact
4) increases the contact ratio
Which of the above statements are correct?

Question 3

In a flat belt drive the belt can be subjected to a maximum tension T and centrifugal tension

. What is the condition for transmission of maximum power?

Question 4

The efficiency of a power screw is a function of
1). Screw geometry.
2). Coefficient of friction.
3). Load on the screw.
Which of these statements are correct?

Question 5

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 6

Which sunk key made the form of a segment of a circular disc of uniform thickness, known as?

Question 7

Match List-I (Type of Anti-friction Bearing) with List-II (Specific Use) select the correct answer using the code given below the lists:
List-I
A). Self-aligning ball bearing
B). Taper roller bearing
C). Deep groove ball bearing
D). Thrust ball bearing
List-II
1). For pure axial load
2). For hinged condition
3). For pure radial load
4). For axial and radial load

Question 8

Two shafts A and B are of same material, and A is twice the diameter of B. The torque that can be transmitted by A is

Question 9

Consider that modern machines mostly use short bearings due to the following reason:
1). l/d of the most modern bearings is in the range of ¼ to 2.
2). No end leakage of oil from the bearing
3). shaft deflection and misalignment do not affect the operation.
4). Can be applied to both hydrodynamic and hydrostatic cases
Which of the above are correct?

Question 10

Assertion (A): Crowning is provided on the surface of a flat pulley to prevent slipping of the belt sideways
Reason (R):Belt creep, which is the reason for slip of the belt sideways, is fully compensated by providing crowing on the pulley.