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Theory of Machine

Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W tanθ
W cosecθ
W sinθ
W cosθ

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Theory of Machine
The number of centers in a crank driven slider crank mechanism is

4
6
2

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Theory of Machine
The unbalanced force due to revolving masses

Constant in magnitude and direction both
Varies in magnitude and direction both
Varies in magnitude but constant in direction
Varies in direction but constant in magnitude

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Theory of Machine
The mechanism consisting of three turning pairs and one sliding pair, is called a

Whitworth quick return motion mechanism
Single slider crank chain
All of these
Crank and slotted lever quick return motion mechanism

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Theory of Machine
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

1/24
12
4/15
1/8

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Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

At 45° to the link joining the points
None of the listed here
Parallel to the link joining the points
Perpendicular to the link joining the points

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