THEORY OF MACHINE QUIZ

In gears, interference takes place when

Gear teeth are undercut

Gears do not move smoothly in the absence of lubrication

Pitch of the gears is not same

The tip of a tooth of a mating gear digs into the portion between base and root circles

TRUE ANSWER : ?
YOUR ANSWER : ?

The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.

Inner edge

Outer edge

None of these

Corners

TRUE ANSWER : ?
YOUR ANSWER : ?

The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r₁ and r₂ = External and internal radii of collar respectively)

(1/2) μ W (r₁ + r₂)

(1/2) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

(2/3) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

(2/3) μ W (r₁ + r₂)

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following mechanisms produces mathematically an exact straight line motion?

Peaucellier's mechanism

Watt mechanism

Tchebicheff mechanism

Grasshopper mechanism

TRUE ANSWER : ?
YOUR ANSWER : ?

If some links are connected such that motion between them can take place in more than one direction, it is called

Incompletely constrained motion

Partially constrained motion

Successfully constrained motion

Completely constrained motion

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following governor is used to drive a gramophone?

Porter governor

Pickering governor

Hartnell governor

Watt governor

TRUE ANSWER : ?
YOUR ANSWER : ?

Sense of tangential acceleration of a link

Could be either same or opposite to velocity

Is opposite to that of velocity

Is same as that of velocity

Is perpendicular to that of velocity

TRUE ANSWER : ?
YOUR ANSWER : ?

The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

Increases

Remain same

Decreases

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Damped vibration

Free vibration

Under damped vibration

Forced vibration

TRUE ANSWER : ?
YOUR ANSWER : ?

When a slider moves on a fixed link having curved surface, their instantaneous centre lies

At the centre of curvature

At the pin joint

On their point of contact

At the centre of circle

TRUE ANSWER : ?
YOUR ANSWER : ?

↑