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Theory of Machine

Theory of Machine
Typewriter constitutes

Machine
Mechanism
Inversion
Structure

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

0° and 90°
270° and 360°
135° and 315°
90° and 180°

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Theory of Machine
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

To move the ship towards port side
To raise the stern and lower the bow
To raise the bow and lower the stern
To move the ship towards starboard

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Theory of Machine
Which of the below are inversions of slider crank mechanism? 1. Oscillating cylinder engine mechanism 2. Toggle mechanism 3. Radial cylinder engine mechanism 4. Quick return mechanism

1, 2 and 3
1, 3 and 4
1, 2 and 4
2, 3 and 4

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Theory of Machine
In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at

90° to each other
120° to each other
180° to each other
45° to each other

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ - ω₂) r
(ω₁ - ω₂) 2r
ω₁.ω₂.r
(ω₁ + ω₂) r

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