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

A. Will remain same

4

# The power from the engine to the rear axle of an automobile is transmitted by means of

Worm and worm wheel

Spur gears

Bevel gears

Hooke's joint

4

# The partial balancing of reciprocating parts in locomotives produces

Hammer blow

Swaying couple

Variation in tractive force along the line of stroke

All of the above

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

Cylindrical pair

Turning pair

Rolling pair

Sliding pair

4

Zero

Minimum

Maximum

None of these

4

# In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

Be zero

Act in upward direction

Act in downward direction

None of the above

4

# When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Lower pair

Higher pair

Self-closed pair

Force-closed pair

4

D/T

T/D

2D/T

2T/D

4

4

# The critical speed of a shaft depends upon its

Mass

Stiffness

Mass and stiffness

Stiffness and eccentricity

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

# Open pairs are those which have

Point or line contact between the two elements when in motion

Surface contact between the two elements when in motion

Elements of pairs not held together mechanically

Two elements that permit relative motion

4

# Cylindrical cams can be classified as

Circular

Tangent

Reciprocating

None of the above

4

# In a four bar chain or quadric cycle chain

Each of the four pairs is a turning pair

One is a turning pair and three are sliding pairs

Two are turning pairs and two are sliding pairs

Three are turning pairs and one is a sliding pair

4

r sinφ

r cosφ

r tanφ

(r/2) cosφ

4

Tractive force

Swaying couple

Hammer blow

None of these

4

Sum

Difference

Product

Ratio

4

Equal to

Less than

Greater than

None of these

4

# The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)

sinφ + sinα = b/c

cosφ - sinα = c/b

cotφ - cotα = c/b

tanφ + cotα = b/c

4

Crank

Connecting rod

Crank pin

4

# Coriolis component acts

Perpendicular to sliding surfaces

Along sliding surfaces

Somewhere in between above two

None of the above

4

# Frequency of vibrations is usually expressed in

Number of cycles per hour

Number of cycles per minute

Number of cycles per second

None of these

4

1, 2 and 4

2, 3 and 4

1, 2 and 3

1, 3 and 4

4

Screw pair

Spherical pair

Turning pair

Sliding pair

4

# The power of a Porter governor is equal to

[c²/(1 + 2c)] (m + M) g.h

[2c²/(1 + 2c)] (m + M) g.h

[3c²/(1 + 2c)] (m + M) g.h

[4c²/(1 + 2c)] (m + M) g.h

4

# Which of the following is an inversion of Single slider crank chain?

Beam engine

Rotary engine

Oldhams coupling

Elliptical trammel

4

L + 1

L - 1

L

L + 2

4

# A mechanism is an assemblage of

Four or more than four links

All of these

4

# In a simple train of wheels, the velocity ratio __________ the intermediate wheels.

Depends upon

Is independent of

Either A or B

None of these