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GATE 2020: Theory of Machine Quiz 6 (App update required to attempt this test)

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Question 1

In balancing of a slider crank mechanism, The magnitude of the secondary forces is________ than the magnitude of the primary force.

Question 2

In case of dynamic balancing of rotating masses how many masses are required for complete balancing and at which planes?

Question 3

For a single cylinder reciprocating engine mass of the reciprocating part is 40kg and mass of the revolving part is 30 kg. If the crank rotate at 150 rpm and the stroke length is 400 mm. Only 60 % of the reciprocating masses and all revolving masses need to be balanced. Determine the required mass at a radius of 300 mm.

Question 4

A toy car is made by a group of students for analyzing the effect of various forces in running a car. The car works with help of a slider crank mechanism fitted inside the toy car. The crank moves with a constant angular velocity of 10 rad/s and the crank radius is 60 mm. If the mass of the slider is 0.2 kg due to which wheel tends to leave the surface then find the hammer blow acting on the car.

Question 5

Determine the maximum swaying couple of a two cylinder locomotive. Consider the following parameters:
Mass of reciprocating parts per cylinder = 300 kg
Distance between cylinder centre lines = 0.55 m
Crank radius = 0.2 m
Radius of wheel=0.9m
Cranks are at angles = 90 °
If the velocity of hammer blow is 80km/h and take c = 0.75

Question 6

A two cylinder 4 stroke locomotive is moving in a frictional road. The crank is rotating at 28 rad/s and length of the stroke is 250 mm and the distance between cylinder centre is 150 mm. The mass of the reciprocating slider is 120kg and only 40% of it is balanced. Find the maximum value of swaying couple in Nm. 
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