4

# The train value of a gear train is

Equal to velocity ratio of a gear train

Reciprocal of velocity ratio of a gear train

Always greater than unity

Always less than unity

B. Reciprocal of velocity ratio of a gear train

4

# The angle of inclination of the plane, at which the body begins to move down the plane is called

Angle of friction

Angle of repose

Angle of projection

None of these

4

0° and 90°

0° and 180°

90° and 180°

180° and 360°

4

1-3 m/s

3-15 m/s

15-30 m/s

30-50 m/s

4

# The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is

Flexible coupling

Universal coupling

Chain coupling

Oldham's coupling

4

# The motion between a pair which takes place in __________ is known as incompletely constrained motion.

One direction only

Two directions only

More than one direction

None of these

4

# Angle of action of cam is defined as the angle

Of rotation of the cam for a definite displacement of the follower

Through which the cam rotates during the period in which the follower remains in the highest position

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

Moved by the cam from beginning of ascent to the termination of descent

4

# In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

Minimise the effect of primary forces

Minimise the effect of secondary forces

Have perfect balancing

To start the locomotive quickly

4

# A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

All points of the disc have the same velocity

The centre of the disc has zero acceleration

The centre of the disc has centrifugal acceleration

The point on the disc making contact with the plane surface has zero acceleration

4

# Oldhams coupling is an inversion of the kinematic chain used in

Whitworth quick return mechanism

Elliptical trammels

Rotary engine

Universal joint

4

# The instantaneous centre of a rigid thin disc rolling on a plane rigid surface is located at

The centre of the disc

The point of contact

An infinite distance on the plane surface

The point on the circumference situated vertically opposite to the contact point

4

Turning pair

Rolling pair

Screw pair

Spherical pair

4

# In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

Will remain same

Will change

Could change or remain unaltered depending on which link is fixed

Will not occur

4

T/3

(T.g)/3

√(T/3m)

√(3m/T)

4

Simple

Compound

Binary

None of these

4

Lower pair

Higher pair

Open pair

Close pair

4

Two forks

One fork

Three forks

Four forks

4

# In a four stroke I.C. engine, the turning moment during the compression stroke is

Positive throughout

Negative throughout

Positive during major portion of the stroke

Negative during major portion of the stroke

4

# The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r₁ = Minimum radius of the cam, r₂ = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement)

(r₁ - r₂) (1 - cosθ)

(r₁ + r₂) (1 + cosθ)

(r₁ - r₂) [(1 - cosθ)/cos θ]

(r₁ + r₂) [(1 - cosθ)/cos θ]

4

(S₁ + S₂)/h

(S₁ - S₂)/h

(S₁ + S₂)/2h

(S₁ - S₂)/2h

4

P = W tan(α - φ)

P = W tan(α + φ)

P = W tan(φ - α)

P = W cos(α + φ)

4

Circular pitch

Diametral pitch

Module

None of these

4

# TJIE horse power transmitted by a belt is dependent upon

Tension on tight side of belt

Tension on slack side of belt

All of the above

4

90° and 180°

45° and 225°

180° and 270°

270° and 360°

4

(r₁ + r₂) (y/x)

(r₁ + r₂) (x/y)

(r₁ - r₂) (y/x)

(r₁ - r₂) (x/y)

4

W sinθ

W cosθ

W tanθ

W cosecθ

4

No node

One node

Two nodes

Three nodes

4

# The centrifugal tension in belts

Increases power transmitted

Decreases power transmitted

Have no effect on power transmitted

Increases power transmitted upto a certain speed and then decreases

4

# A higher pair has__________.

Point contact

Surface contact

No contact

None of the above

4

# The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at

45° in the direction of rotation of the link containing the path

45° in the direction opposite to the rotation of the link containing the path

90° in the direction of rotation of the link containing the path

180° in the direction opposite to the rotation of the link containing the path