THEORY OF MACHINE QUIZ

The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

ωr [sin θ + (sin 2θ/n)]

ω²r [sin θ + (sin 2θ/n)]

ωr [cos θ + (cos 2θ/n)]

ω²r [cos θ + (cos 2θ/n)]

TRUE ANSWER : ?
YOUR ANSWER : ?

If the opposite links of a four bar linkage are equal, the links will always form a

Triangle

Pentagon

Rectangle

Parallelogram

TRUE ANSWER : ?
YOUR ANSWER : ?

The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

180° and 360°

None of these

0° and 90°

Both (A) and (B)

TRUE ANSWER : ?
YOUR ANSWER : ?

An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

Clearance circle

Addendum circle

Pitch circle

Dedendum circle

TRUE ANSWER : ?
YOUR ANSWER : ?

In involute gears, the pressure angle is

Dependent on the size of gears

Dependent on the size of teeth

Always variable

Always constant

TRUE ANSWER : ?
YOUR ANSWER : ?

A spring controlled governor is found unstable. It can be made stable by

Increasing the spring stiffness

Decreasing the spring stiffness

Decreasing the ball mass

Increasing the ball mass

TRUE ANSWER : ?
YOUR ANSWER : ?

Rectilinear motion of piston is converted into rotary by

Cross head

Slider crank

Gudgeon pin

Connecting rod

TRUE ANSWER : ?
YOUR ANSWER : ?

The axis of precession is __________ to the plane in which the axis of spin is going to rotate.

Perpendicular

Both A and B

Parallel

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Peaucellier’s mechanism has

Six links

Twelve links

Four links

Eight links

TRUE ANSWER : ?
YOUR ANSWER : ?

The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

Difference

Ratio

Sum

Product

TRUE ANSWER : ?
YOUR ANSWER : ?

↑