THEORY OF MACHINE QUIZ

Which of the following would constitute a link?

Piston and piston rod

Piston, piston rod and cross head

Piston rod and cross head

Piston, crank pin and crank shaft

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Any point on a link connecting double slider crank chain will trace a

Parabola

Ellipse

Circle

Straight line

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Efficiency of a screw jack is given by

tanα/tan (α +φ)

tan (α - φ)/tanα

tanα/tan (α - φ)

tan (α + φ)/tanα

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When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

Hunt

Stable

Isochronous

Unstable

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If the damping factor for a vibrating system is unity, then the system will be

Over damped

Without vibrations

Critically damped

Under damped

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In a screw jack, the effort required to lower the load W is given by

P = W cos(α + φ)

P = W tan(α - φ)

P = W tan(φ - α)

P = W tan(α + φ)

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The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

To dip the nose and tail

To raise the nose and tail

To raise the nose and dip the tail

To dip the nose and raise the tail

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In railway axle boxes, the bearing used is

Cylindrical roller bearing

Deep groove ball bearing

Double row spherical roller bearing

Double row self aligning ball bearing

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A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

2 fn

4 fn

fn/2

8 fn

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Scotch yoke mechanism is used to generate

Logarithms

Inversions

Square roots

Sine functions

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