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Machine Design

Machine Design
The material commonly used for crane hooks is

Cast iron
Aluminium
Mild steel
Wrought iron

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Machine Design
The power transmitted by the belt drive can be increased by

All of these
Increasing the initial tension in the belt
Dressing the belt to increase the coefficient of friction
Increasing wrap angle by using idler pulley

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Machine Design
For low and moderate speed engines, the cam follower should move with

Cycloidal motion
Uniform acceleration and retardation
Uniform velocity
Simple harmonic motion

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Machine Design
In unilateral system of tolerance, the tolerance is allowed on

One side of the actual size
Both sides of the actual size
One side of the nominal size
Both sides of the nominal size

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/2
8W/9
2W/3
W/9

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Machine Design
The value of Lewis form factor used in design of gears is

All of these
Independent of size of teeth
Dependent on number of teeth of a gear
Dependent on system of teeth

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