At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

The two rigid links have no linear velocities relative to each other at the instantaneous centre

The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

The double centre can be denoted either by O2 or O12, but proper selection should be made

D. The double centre can be denoted either by O2 or O12, but proper selection should be made

ω √(x² - r²)

ω √(r² - x²)

ω² √(x² - r²)

ω² √(r² - x²)

The system is unbalanced

Bearing centre line coincides with the axis

The shafts are rotating at very high speeds

Resonance is caused due to the heavy mass of the rotor

Rack and pinion

Worm and wheel

Spiral gears

None of the above

Equal to

Less than

Greater than

None of these

Minimum

Maximum

Zero

Infinity

Lower pair

Higher pair

Spherical pair

Cylindrical pair

Theory of machines

Applied mechanics

Mechanisms

Kinetics

Screw pair

Spherical pair

Turning pair

Sliding pair

1 link with pin joints

2 links with pin joints

3 links with pin joints

4 links with pin joints

ωr [sin θ + (sin 2θ/n)]

ωr [cos θ + (cos 2θ/n)]

ω²r [sin θ + (sin 2θ/n)]

ω²r [cos θ + (cos 2θ/n)]

1, 3

2, 2

3, 1

4, 0

Structure

Mechanism

Kinematic chain

Inversion

Primary forces and couples must be balanced

Secondary forces and couples must be balanced

Both (A) and (B)

None of these

sin (θ + φ) + 1/ cos (θ - φ) + 1

cos (θ - φ) + 1/ sin (θ + φ) + 1

cos (θ + φ) + 1/ cos (θ - φ) + 1

cos (θ - φ) + 1/ cos (θ + φ) + 1

Small

Too small

Large

Too large

Cylinder and piston

Piston rod and connecting rod

Crankshaft and flywheel

Flywheel and engine frame

Material of the pulley

Material of the belt

Larger size of the driver pulley

Uneven extensions and contractions due to varying tension

Pitch circle to the bottom of a tooth

Pitch circle to the top of a tooth

Top of a tooth to the bottom of a tooth

Addendum circle to the clearance circle

Two forks

One fork

Three forks

Four forks

Sum of base circle radii/cosφ

Difference of base circle radii/ cosφ

Sum of pitch circle radii/ cosφ

Difference of pitch circle radii/ cosφ

The primary unbalanced force is less than the secondary unbalanced force.

The primary unbalanced force is maximum twice in one revolution of the crank.

The unbalanced force due to reciprocating masses varies in magnitude and direction both.

The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines

Closed pair

Open pair

Mechanical pair

Rolling pair

0

1

2

-1

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

Gears do not move smoothly in the absence of lubrication

Pitch of the gears is not same

Gear teeth are undercut

Ellipse

Circle

Parabola

Hyperbola

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

Cause withdrawing or throttling of steam

Reduce length of effective stroke of piston

Reduce maximum opening of port to steam

All of these

± c.m.ω².r

± a (1 - c) m.ω².r

± (a/√2) (1 - c) m.ω².r

± 2a (1 - c) m.ω².r

Pressure angle

Circular pitch

Diametral pitch

Pitch circle diameter

Lower pair

Higher pair

Self-closed pair

Force-closed pair