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4

In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

A. Total lift, total angle of lift, minimum radius of cam and cam speed

B. Radius of circular arc, cam speed, location of centre of circular arc and roller diameter

C. Mass of cam follower linkage, spring stiffness and cam speed

D. Total lift, centre of gravity of the cam and cam speed

Correct Answer :

A. Total lift, total angle of lift, minimum radius of cam and cam speed


Related Questions

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4

The pressure angle of a cam depends upon

A. Offset between centre lines of cam and follower

B. Lift of follower

C. Angle of ascent

D. All of the above

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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

V-belts are usually used for

A. Long drives

B. Short drives

C. Long and short drives

D. None of these

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4

A cam with a roller follower would constitute following type of pair

A. Lower pair

B. Higher pair

C. Open pair

D. Close pair

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4

Which of the following statements regarding laws governing the friction between dry surfaces are correct?

A. The friction force is dependent on the materials of the contact surfaces.

B. The friction force is directly proportional to the normal force.

C. The friction force is independent of me area of contact.

D. All of the above

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4

A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

A. fn/2

B. 2 fn

C. 4 fn

D. 8 fn

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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

The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

A. (1/2) μ W R

B. (2/3) μ W R

C. (3/4) μ W R

D. μ W R

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4

When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

A. Stable

B. Unstable

C. Isochronous

D. Hunt

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4

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

A. To move the ship towards starboard

B. To move the ship towards port side

C. To raise the bow and lower the stern

D. To raise the stern and lower the bow

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4

In S.H.M., acceleration is proportional to

A. Velocity

B. Displacement

C. Rate of change of velocity

D. All of the above

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4

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

A. Equal to

B. Directly proportional to

C. Inversely proportional to

D. Independent of

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4

Which of the following is an open pair?

A. Ball and socket joint

B. Journal bearing

C. Lead screw and nut

D. Cam and follower

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4

The example of rolling pair is

A. Bolt and nut

B. Lead screw of a lathe

C. Ball and socket joint

D. Ball bearing and roller bearing

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4

With usual notations for different parameters involved, the maximum fluctuations of energy for a flywheel is given by

A. 2ECS

B. ECS/2

C. 2ECS²

D. 2E²CS

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4

In a reciprocating engine, usually __________ of the reciprocating masses are balanced.

A. One-half

B. Two-third

C. Three-fourth

D. Whole

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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

Which gear is used for connecting two coplanar and intersecting shafts?

A. Spur gear

B. Helical gear

C. Bevel gear

D. None of the above

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4

The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

A. ω₁.ω₂.r

B. (ω₁ - ω₂) r

C. (ω₁ + ω₂) r

D. (ω₁ - ω₂) 2r

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4

The partial balancing of reciprocating parts in locomotives produces

A. Hammer blow

B. Swaying couple

C. Variation in tractive force along the line of stroke

D. All of the above

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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

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

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

C. 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

D. All of the above

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4

In an open pair, the two elements of a pair

A. Have a surface contact when in motion

B. Have a line or point contact when in motion

C. Are kept in contact by the action of external forces, when in motion

D. Are not held together mechanically

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4

The Klein's diagram is useful to find

A. Displacement of various parts

B. Velocity of various parts

C. Acceleration of various parts

D. Angular acceleration of various parts

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4

When a slider moves on a fixed link having curved surface, their instantaneous centre lies

A. On their point of contact

B. At the centre of curvature

C. At the centre of circle

D. At the pin joint

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4

For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a

A. 30° V-engine

B. 60° V-engine

C. 120° V-engine

D. 150° V-engine

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4

Tangential acceleration direction is

A. Along the angular velocity

B. Opposite to angular velocity

C. May be any one of these

D. Perpendicular to angular velocity

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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

The ratio of maximum fluctuation of speed to the mean speed is called

A. Fluctuation of speed

B. Maximum fluctuation of speed

C. Coefficient of fluctuation of speed

D. None of these

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4

The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)

A. sinα = b/c

B. cosα = c/b

C. tanα = c/2b

D. cotα = c/2b

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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