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4

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

A. Universal joint

B. Knuckle joint

C. Oldham's coupling

D. Flexible coupling

Correct Answer :

C. Oldham's coupling


Related Questions

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4

The Bifilar suspension method is used to determine

A. Natural frequency of vibration

B. Position of balancing weights

C. Moment of inertia

D. Centripetal acceleration

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4

Which of the following has sliding motion?

A. Crank

B. Connecting rod

C. Crank pin

D. Crosshead

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4

If two moving elements have surface contact in motion, such pair is known as

A. Sliding pair

B. Rolling pair

C. Surface pair

D. Higher pair

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A higher pair has__________.

A. Point contact

B. Surface contact

C. No contact

D. None of the above

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4

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

A. Pendulum pump

B. Oscillating cylinder engine

C. Rotary internal combustion engine

D. All of these

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4

The power of a Porter governor is equal to

A. [c²/(1 + 2c)] (m + M) g.h

B. [2c²/(1 + 2c)] (m + M) g.h

C. [3c²/(1 + 2c)] (m + M) g.h

D. [4c²/(1 + 2c)] (m + M) g.h

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4

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

A. Between I₁, and I₂ but nearer I₁

B. Between I₁, and I₂ but nearer to I₂

C. Exactly in the middle of the shaft

D. Nearer to I₁ but outside

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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

A. ω sinθ/(n² - sin²θ)1/2

B. ω cosθ/(n² - cos²θ)1/2

C. ω sinθ/(n² - cos²θ)1/2

D. ω cosθ/(n² - sin²θ)1/2

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4

Shaft revolving in a bearing is the following type of pair

A. Lower pair

B. Higher pair

C. Spherical pair

D. Cylindrical pair

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4

Typewriter constitutes

A. Machine

B. Structure

C. Mechanism

D. Inversion

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4

The minimum force required to slide a body of weight W on a rough horizontal plane is

A. W sinθ

B. W cosθ

C. W tanθ

D. W cosecθ

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4

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

A. Grasshopper mechanism

B. Watt mechanism

C. Peaucellier's mechanism

D. Tchebicheff mechanism

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4

Which of the following is a higher pair?

A. Turning pair

B. Screw pair

C. Belt and pulley

D. None of the above

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4

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

A. Watt governor

B. Porter governor

C. Pickering governor

D. Hartnell governor

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4

The lead screw of a lathe with nut forms a

A. Rolling pair

B. Sliding pair

C. Screw pair

D. Turning pair

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4

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

A. Parallel to AB

B. Perpendicular to AB

C. Along AB

D. At 45° to AB

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4

When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side.

A. Upward

B. Downward

C. Forward

D. Backward

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4

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

A. Parallel to OA

B. Perpendicular to OA

C. At 45° to OA

D. Along AO

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4

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

A. Less sensitive

B. More sensitive

C. Unaffected of sensitivity

D. Isochronous

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4

With single Hooke's joint it is possible to connect two shafts, the axes of which have an angular misalignment up to

A. 10°

B. 20°

C. 30°

D. 40°

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4

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

A. Unbalanced couples are caused only at higher speeds

B. Unbalanced forces are not dangerous at higher speeds

C. Effects of unbalances are proportional to the square of the speed

D. Effects of unbalances are directly proportional to the speed

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4

In a kinematic chain, a quaternary joint is equivalent to

A. One binary joint

B. Two binary joints

C. Three binary joints

D. Four binary joints

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4

In a radial cam, the follower moves

A. In a direction perpendicular to the cam axis

B. In a direction parallel to the cam axis

C. In any direction irrespective of the cam axis

D. Along the cam axis

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4

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

A. (1/2). μ W cosecα (r₁ + r₂)

B. (2/3). μ W cosecα (r₁ + r₂)

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

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

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4

One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

A. 2π. √(g/δ)

B. 1/2π. √(g/δ)

C. 2π. √(δ/g)

D. 1/2π. √(δ/g)

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4

In gears, interference takes place when

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

B. Gears do not move smoothly in the absence of lubrication

C. Pitch of the gears is not same

D. Gear teeth are undercut

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4

The Klein's diagram is used when

A. Crank has uniform angular velocity

B. Crank has nonuniform angular velocity

C. Crank has uniform angular acceleration

D. Crank has nonuniform angular acceleration

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4

The cam follower generally used in aircraft engines is

A. Knife edge follower

B. Flat faced follower

C. Spherical faced follower

D. Roller follower

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4

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

A. Along PO

B. Perpendicular to PO

C. At 45° to PO

D. None of the above

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The ratio of maximum fluctuation of energy to the workdone per cycle is called

A. Fluctuation of energy

B. Maximum fluctuation of energy

C. Coefficient of fluctuation of energy

D. None of these