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GATE ME 2018: Machine Design Rapid Revision Test

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Question 1

The life of a ball bearing at a load of 10 KN is 8000 hours. Ifthe load is increased to 20 KN, keeping all other conditions the same, then its life in hours is

Question 2

Two metal plates of thickness $Description: Description:ISROME2009_files\image197.png$ and ‘w’ are joined by a fillet wield of 45 °C as shown in fig. When subjected to a pulling force “F” the stress induced in the weld will be
$Description: Description:ISROME2009_files\image198.png$

Question 3

If the ratio of the diameter of rivet hole to the pitch of rivets is 0.25, then the efficiency of the joint is.

Question 4

In a ball bearing, if the number of balls is reduced to half and diameter of the ball is increased to 4 times, then static load capacity of the ball bearing is _________.

Question 5

A cylindrical shaft is subjected to alternate stress of 100 MPa. Fatigue strength to sustain 1000 cycles is 490 MPa. If endurance limit is 70 MPa. Find shaft life.

Question 6

To compress a helical spring that is already compressed, where
Lo = 5.0 cm = 0.05 m
Li = 4.5 cm = 0.045 m
Lf = 3.5 cm = 0.035 m
k = 18,000 N/m
The work done will be:

Question 7

The minimum number of teeth on the pinion to operate without interference in standard full height involute teeth gear mechanism with 20 ° pressure angle is
where A_p=1.457

Question 8

A shaft is subjected to a reversed axial load of 200 kN. Ultimate and yield stresses are 1000 MPa and 900 MPa respectively. The corrected Endurance limit for reversed bending is 400MPa. If Factor of safety is 2, using Goodman equation, the required diameter of the shaft (in mm) is

Question 9

A machine element has an ultimate strength

, and endurance limit of

. The fatigue curve for the element on log-log plot is shown below. If the element is to be designed for a finite of 10000 cycles, the maximum amplitude of a completely reversed operating stress is _________

Question 10

In case of a multiple disc clutch, if n₁ are the number of discs on the driving shaft and n₂ are the number of the discs on the drive shaft, then the number of pairs of contact surfaces will be

Question 11

A single riveted lap joint of 6 mm plates with 20 mm diameter rivets having a pitch of 50 mm. Assume permissible tensile stress in the plates 120 MPa a, permissible shear stress in the rivets is 90 MPa and permissible crushing stress in the rivets is 180 MPa. The efficiency of Joint is______.
(Given Tearing Resistance=21600N, Shearing Resistance=28278N, Crushing Resistance= 23800N )

Question 12

A radial load = 5.6 kN acts for two hours on a rolling bearing and then reduces to = 3.3 kN for one hour. The cycle then repeats itself. the shaft rotates at 300 rev/ min. What will be mean cubic load (), which should be used in rating the bearing for a life it 12,000 hour

Question 13

A single row deep groove ball bearing is subjected to radial load of 1800 N and axial load of 1200 N. It has basic dynamic load rating = 42000 N
[Take, Radial factor, X = 0.50, Thrust factor, Y = 1 , Rotation factor, V = 1]
Rated life of the bearing is ___________ x 10⁶revolutions.

Question 14

In a single plate clutch having angular velocity of 210 rad/s. The mass and radius of gyration of input shaft is 25 kg and 80 mm respectively while the output shaft have 34 kg and 110mm of mass and radius of gyration respectively. Calculate the heat generated during clutching operation?

Question 15

A cylindrical shaft is subjected to an alternating stress of 100 MPa. Fatigue strength to sustain 1000 cycle is 490 MPa. If the corrected endurance strength is 70 MPa, estimated shaft life will be

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ESE & GATE ME Machine Design

Aug 21ESE & GATE ME