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4

When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

A. Zero

B. One

C. π/2

D. π

Correct Answer :

B. One


Related Questions

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4

In its simplest form, a cam mechanism consists of following number of links

A. 1

B. 2

C. 3

D. 4

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4

In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.

A. Remains constant

B. Decreases

C. Increases

D. None of these

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4

For simple harmonic motion of the of follower, a cosine curve represents

A. Displacement diagram

B. Velocity diagram

C. Acceleration diagram

D. All of the above

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4

A spring controlled governor is said to be unstable when the controlling force

A. Increases as the radius of rotation decreases

B. Increases as the radius of rotation increases

C. Decreases as the radius of rotation increases

D. Remains constant for all radii of rotation

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4

A shaft carrying three rotors will have

A. No node

B. One node

C. Two nodes

D. Three nodes

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4

If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

A.

B. 90°

C. 180°

D. 360°

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4

For low and moderate speed engines, the cam follower should move with

A. Uniform velocity

B. Simple harmonic motion

C. Uniform acceleration and retardation

D. Cycloidal motion

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4

Oldhams coupling is an inversion of the kinematic chain used in

A. Whitworth quick return mechanism

B. Elliptical trammels

C. Rotary engine

D. Universal joint

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4

ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is

A. v

B. (2/3). v

C. (3/2). v

D. (9/4). v

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4

A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

A. All points of the disc have the same velocity

B. The centre of the disc has zero acceleration

C. The centre of the disc has centrifugal acceleration

D. The point on the disc making contact with the plane surface has zero acceleration

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4

The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

A. Sum

B. Difference

C. Product

D. Ratio

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4

The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is

A. Fc = ar + b

B. Fc = ar - b

C. Fc = ar

D. Fc = a/r + b

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4

Effort of a governor is the

A. Mean force exerted at the sleeve for a given percentage change of speed

B. Workdone at the sleeve for maximum equilibrium speed

C. Mean force exerted at the sleeve for maximum equilibrium speed

D. None of the above

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4

Rectangular bar in a rectangular hole is the following type of pair

A. Completely constrained motion

B. Partially constrained motion

C. Incompletely constrained motion

D. Freely constrained motion

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4

The brake commonly used in railway trains is

A. Shoe brake

B. Band brake

C. Band and block brake

D. Internal expanding brake

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4

To obviate axial thrust, following gear drive is used

A. Double helical gears having opposite teeth

B. Double helical gears having identical teeth

C. Single helical gear in which one of the teeth of helix angle a is more

D. Mutter gears

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4

A body is said to be under forced vibrations, when

A. There is a reduction in amplitude after every cycle of vibration

B. No external force acts on a body, after giving it an initial displacement

C. A body vibrates under the influence of external force

D. None of the above

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4

A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal forc

A. The reaction on me inner wheels increases and on the outer wheels decreases

B. The reaction on the outer wheels increases and on the inner wheels decreases

C. The reaction on the front wheels increases and on the rear wheels decreases

D. The reaction on the rear wheels increases and on the front wheels decreases

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4

Cylindrical cams can be classified as

A. Circular

B. Tangent

C. Reciprocating

D. None of the above

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4

Which type of gearing is used in steering system of an automobile?

A. Rack and pinion

B. Worm and wheel

C. Spiral gears

D. None of the above

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4

Any point on a link connecting double slider crank chain will trace a

A. Straight line

B. Circle

C. Ellipse

D. Parabola

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4

If D₁ and D₂ be the diameters of driver and driven pulleys, then belt speed is proportional to

A. D₁/D₂

B. D₂/D₁

C. D₁.D₂

D. D₁

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4

The periodic time is given by (where ω = Angular velocity of the particle in rad/s)

A. ω/2π

B. 2π/ω

C. ω × 2π

D. π/ω

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4

The cam follower generally used in automobile engines is

A. Knife edge follower

B. Flat faced follower

C. Spherical faced follower

D. Roller follower

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4

In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.

A. Yes

B. No

C. Unpredictable

D. None of these

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4

A system in dynamic balance implies that

A. The system is critically damped

B. There is no critical speed in the system

C. The system is also statically balanced

D. There will absolutely no wear of bearings

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4

Transmission angle is the angle between

A. Input link and coupler

B. Input link and fixed link

C. Output link and coupler

D. Output link and fixed link

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4

Coriolis component acts

A. Perpendicular to sliding surfaces

B. Along sliding surfaces

C. Somewhere in between above two

D. None of the above

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4

Which of the following statement is correct for involute gears?

A. The interference is inherently absent.

B. The variation in centre distance of shafts increases radial force.

C. A convex flank is always in contact with concave flank.

D. The pressure angle is constant throughout the teeth engagement.

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4

The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.

A. Less

B. More

C. Same

D. None of these