4

c (m - M) g

c (m + M) g

c/(m + M) g

c/(m - M) g

B. c (m + M) g

4

# In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then

Acceleration and velocity of the piston P is zero

Acceleration and velocity of the piston P is maximum

Acceleration of the piston P is zero and its velocity is maximum

Acceleration of the piston P is maximum and its velocity is zero

4

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

Beam engine

Rotary engine

Oldhams coupling

Elliptical trammel

4

# The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

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

4

30° V-engine

60° V-engine

120° V-engine

150° V-engine

4

# The cam follower generally used in aircraft engines is

Knife edge follower

Flat faced follower

Spherical faced follower

Roller follower

4

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

Free vibration

Forced vibration

Damped vibration

Under damped vibration

4

# A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

The sum of the two masses is equal to the total mass of body

The centre of gravity of the two masses coincides with that of the body

The sum of mass moment of inertia of the masses about their centre of gravity is equal to the mass moment of inertia of the body

All of the above

4

# In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.

Equal to

Directly proportional to

Inversely proportional to

Independent of

4

# Creep in belt drive is due to

Weak material of the belt

Weak material of the pulley

Uneven extensions and contractions of the belt when it passes from tight side to slack side

Expansion of the belt

4

Sine functions

Square roots

Logarithms

Inversions

4

ωv

2ωv

ω²v

2ωv²

4

Bevel gear

Universal joint

Hooke's joint

Knuckle joint

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

# In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Reduce vibration

Reduce slip

Ensure proper alignment

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

P = W tan(α - φ)

P = W tan(α + φ)

P = W tan(φ - α)

P = W cos(α + φ)

4

ω² × OQ

ω² × OQ sinθ

ω² × OQ cosθ

ω² × OQ tanθ

4

Diameter of disc

Span of shaft

Eccentricity

All of these

4

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

Whitworth quick return mechanism

Elliptical trammels

Rotary engine

Universal joint

4

Maximum

Minimum

Zero

None of these

4

P = 2L - 4

P = 2L + 4

P = 2L + 2

P = 2L - 2

4

# For the same lift and same angle of ascent, a smaller base circle will give

A small value of pressure angle

A large value of pressure angle

There is no such relation with pressure angle

Something else

4

6 times more

6 times less

2.44 times more

2.44 times less

4

# The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ r₂) sinθ

ω (r₁ + r₂) sinθ sec2θ

ω (r₁ r₂) cosθ

ω (r₁ + r₂) cosθ cosec2θ

4

4

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

Tangential component

Coriolis component

None of these

4

Two forks

One fork

Three forks

Four forks

4

# In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then

Open belt drive is recommended

Crossed belt drive is recommended

Both open belt drive and crossed belt drive is recommended

The drive is recommended depending upon the torque transmitted

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.