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ISRO ME Quiz 2 : Machine Design

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Question 1

The sun gear in the figure is driven clockwise at 100 rpm. The ring gear is held stationary. For the number of teeth shown on the gears, the arm rotates at

Question 2

Fatigue failure is caused due to effect of:

Question 3

The coupling used to connect two shafts with large angular misalignment is____.

Question 4

Welds having strings deposited on unbroken surface to have required dimensions are known as:

Question 5

The velocity ratio between pinion and gear in a gear drive is 2.5, the module of the teeth is 2.0 mm and sum of number of teeth on pinion and gear is 105. What is the centre distance (in mm) between pinion and gear?

Question 6

A natural feed journal bearing of diameter 50 mm and length 50 mm operating at 20 revolution/second carries a load of 2.0 k N. The lubricant used has a viscosity of 20 mPa s. The radial clearance is 50 μm. The Somerfield number for the bearing is

Question 7

In a band brake the ratio of tight side band tension to the tension on the slack side is 3. If the angle of overlap of band on the drum is 180 ° the coefficient of friction required between drum and the band is

Question 8

The life of a ball bearing at a load of 10 kN is 8000 hours. Its life in hours, if the load is increased to 20 kN, keeping all other conditions the same, is

Question 9

Which one of the following is the most conservative fatigue failure criterion?

Question 10

A steel bolt having a nominal diameter of 20 mm and a pitch of 2.4 mm is used to connect two plates of 10 mm thickness each. An aluminium tube of inner diameter 22 mm and outer diameter of 40 mm is separating the plates as shown in figure. The nut is pulled snug (just tight) and then given a one-third additional turn. Find the resulting stresses in the bolt and the tube neglecting the deformation of the plates. Young’s modulus of steel and aluminium are 207 × 10³ MPa and 67.5 ×10³ MPa respectively.
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ESE & GATE ME Machine Design

Sep 7ESE & GATE ME