4

# It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by

Universal joint

Knuckle joint

Oldham's coupling

Flexible coupling

C. Oldham's coupling

4

# The Bifilar suspension method is used to determine

Natural frequency of vibration

Position of balancing weights

Moment of inertia

Centripetal acceleration

4

Crank

Connecting rod

Crank pin

4

Sliding pair

Rolling pair

Surface pair

Higher pair

4

# A higher pair has__________.

Point contact

Surface contact

No contact

None of the above

4

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

Pendulum pump

Oscillating cylinder engine

Rotary internal combustion engine

All of these

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

# In the two rotor system as shown in the below figure (I₁ < I₂), a node of vibration is situated

Between I₁, and I₂ but nearer I₁

Between I₁, and I₂ but nearer to I₂

Exactly in the middle of the shaft

Nearer to I₁ but outside

4

# In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

ω sinθ/(n² - sin²θ)1/2

ω cosθ/(n² - cos²θ)1/2

ω sinθ/(n² - cos²θ)1/2

ω cosθ/(n² - sin²θ)1/2

4

Lower pair

Higher pair

Spherical pair

Cylindrical pair

4

Machine

Structure

Mechanism

Inversion

4

W sinθ

W cosθ

W tanθ

W cosecθ

4

# Which of the following mechanisms produces mathematically an exact straight line motion?

Grasshopper mechanism

Watt mechanism

Peaucellier's mechanism

Tchebicheff mechanism

4

# Which of the following is a higher pair?

Turning pair

Screw pair

Belt and pulley

None of the above

4

# Which of the following governor is used to drive a gramophone?

Watt governor

Porter governor

Pickering governor

Hartnell governor

4

Rolling pair

Sliding pair

Screw pair

Turning pair

4

# The relative velocity of B with respect to A in a rigid link AB is

Parallel to AB

Perpendicular to AB

Along AB

At 45° to AB

4

Upward

Downward

Forward

Backward

4

# In a rigid link OA, velocity of A w.r.t. O will be

Parallel to OA

Perpendicular to OA

At 45° to OA

Along AO

4

# In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

Less sensitive

More sensitive

Unaffected of sensitivity

Isochronous

4

10°

20°

30°

40°

4

# The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Unbalanced couples are caused only at higher speeds

Unbalanced forces are not dangerous at higher speeds

Effects of unbalances are proportional to the square of the speed

Effects of unbalances are directly proportional to the speed

4

# In a kinematic chain, a quaternary joint is equivalent to

One binary joint

Two binary joints

Three binary joints

Four binary joints

4

# In a radial cam, the follower moves

In a direction perpendicular to the cam axis

In a direction parallel to the cam axis

In any direction irrespective of the cam axis

Along the cam axis

4

# The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is

(1/2). μ W cosecα (r₁ + r₂)

(2/3). μ W cosecα (r₁ + r₂)

(1/2). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]

(2/3). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]

4

2π. √(g/δ)

1/2π. √(g/δ)

2π. √(δ/g)

1/2π. √(δ/g)

4

# In gears, interference takes place when

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

4

# The Klein's diagram is used when

Crank has uniform angular velocity

Crank has nonuniform angular velocity

Crank has uniform angular acceleration

Crank has nonuniform angular acceleration

4

# The cam follower generally used in aircraft engines is

Knife edge follower

Flat faced follower

Spherical faced follower

Roller follower

4

# The absolute acceleration of any point P in a link about center of rotation O is

Along PO

Perpendicular to PO

At 45° to PO

None of the above