4

# The component of the acceleration, parallel to the velocity of the particle, at the given instant is called

Tangential component

Coriolis component

None of these

B. Tangential component

4

4

Stable

Unstable

Isochronous

None of these

4

# Which one of the following can completely balance several masses revolving in different planes on a shaft?

A single mass in different planes

Two masses in any two planes

A single mass in one of the planes of the revolving masses

Two equal masses in any two planes

4

# The maximum or minimum value of the swaying couple is

± c.m.ω².r

± a (1 - c) m.ω².r

± (a/√2) (1 - c) m.ω².r

± 2a (1 - c) m.ω².r

4

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

Beam engine

Rotary engine

Oldhams coupling

Elliptical trammel

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

ωx

ω²x

ω²/x

ω³/x

4

# Which of the following statement is correct?

The power absorbed in operating the piston valve is less than D-slide valve

The wear of the piston valve is less than the wear of the D-slide valve

The D-slide valve is also called outside admission valve.

All of the above

4

# A circular bar moving in a round hole is an example of

Incompletely constrained motion

Partially constrained motion

Completely constrained motion

Successfully constrained motion

4

n₁ + n₂

n₁ + n₂ + 1

n₁ + n₂ - 1

n₁ + n₂ - 2

4

# The partial balancing means

Balancing partially revolving masses

Balancing partially reciprocating masses

Best balancing of engines

All of these

4

# The example of spherical pair is

Bolt and nut

Ball and socket joint

Ball bearing and roller bearing

4

# The maximum fluctuation of energy is the

Difference between the maximum and minimum energies

Sum of the maximum and minimum energies

Variations of energy above and below the mean resisting torque line

Ratio of the mean resisting torque to the workdone per cycle

4

θ/2

θ

4

# The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

Damping factor

Damping coefficient

Logarithmic decrement

Magnification factor

4

1, 3

2, 2

3, 1

4, 0

4

# The example of lower pair is

Shaft revolving in a bearing

Straight line motion mechanisms

Automobile steering gear

All of the above

4

# In a reciprocating steam engine, which of the following forms a kinematic link?

Cylinder and piston

Piston rod and connecting rod

Crankshaft and flywheel

Flywheel and engine frame

4

l = 2p - 2

l = 2p - 3

l = 2p - 4

l = 2p - 5

4

0

2

4

6

4

ω

ωr

ω²r

ω/r

4

# In a mechanism, the fixed instantaneous centres are those centres which

Remain in the same place for all configurations of the mechanism

Vary with the configuration of the mechanism

Moves as the mechanism moves, but joints are of permanent nature

None of the above

4

# Which of the following statement is correct?

The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation.

The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.

The velocity of a particle moving with simple harmonic motion is zero at the mean position.

The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.

4

Turning pair

Rolling pair

Sliding pair

Spherical pair

4

# The danger of breakage and vibration is maximum

Below the critical speed

Near the critical speed

Above the critical speed

None of these

4

# Sense of tangential acceleration of a link

Is same as that of velocity

Is opposite to that of velocity

Could be either same or opposite to velocity

Is perpendicular to that of velocity

4

# Kinematic pairs are those which have two elements that

Have line contact

Have surface contact

Permit relative motion

Are held together

4

# In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

Critical damping ratio

Damping factor

Logarithmic decrement

Magnification factor

4

# The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

m.ω².r cosθ

c.m.ω².r sinθ

(1 - c).m.ω².r (cosθ - sinθ)

m.ω².r (cosθ - sinθ)