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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

Correct Answer :

B. 2π/ω


Related Questions

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4

Which of the following statement is correct?

A. The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation.

B. The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.

C. The velocity of a particle moving with simple harmonic motion is zero at the mean position.

D. The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.

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4

In multi V-belt transmission, if one of the belt is broken, we have to change the

A. Broken belt

B. Broken belt and its adjacent belts

C. All the belts

D. There is no need of changing any one as remaining belts can take care of transmission of load

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4

An exact straight line motion mechanism is a

A. Scott-Russell's mechanism

B. Hart's mechanism

C. Peaucellier's mechanism

D. All of these

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4

In a four bar chain or quadric cycle chain

A. Each of the four pairs is a turning pair

B. One is a turning pair and three are sliding pairs

C. Two are turning pairs and two are sliding pairs

D. Three are turning pairs and one is a sliding pair

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4

When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a

A. Screw pair

B. Spherical pair

C. Turning pair

D. Sliding pair

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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

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

The method of direct and reverse cranks is used in engines for

A. The control of speed fluctuations

B. Balancing of forces and couples

C. Kinematic analysis

D. Vibration analysis

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4

Creep in belt drive is due to

A. Material of the pulley

B. Material of the belt

C. Larger size of the driver pulley

D. Uneven extensions and contractions due to varying tension

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4

The contact ratio is the ratio of

A. Length of pair of contact to the circular pitch

B. Length of arc of contact to the circular pitch

C. Length of arc of approach to the circular pitch

D. Length of arc of recess to the circular pitch

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4

The Coriolis component of acceleration acts

A. Along the sliding surface

B. Perpendicular to the sliding surface

C. At 45° to the sliding surface

D. Parallel to the sliding surface

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4

An automobile steering gear is an example of

A. Sliding pair

B. Rolling pair

C. Lower pair

D. Higher pair

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4

For a kinematic chain to be considered as mechanism

A. Two links should be fixed

B. One link should be fixed

C. None of the links should be fixed

D. There is no such criterion

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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

The two elements of a pair are said to form a higher pair, when they

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. Permit relative motion

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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

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

A. sin (θ + φ) + 1/ cos (θ - φ) + 1

B. cos (θ - φ) + 1/ sin (θ + φ) + 1

C. cos (θ + φ) + 1/ cos (θ - φ) + 1

D. cos (θ - φ) + 1/ cos (θ + φ) + 1

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4

A pantograph is a mechanism with

A. Lower pairs

B. Higher pairs

C. Rolling pairs

D. Turning pairs

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4

A rotary internal combustion engine has __________ cylinders.

A. Four

B. Five

C. Six

D. Seven

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4

The train value of a gear train is

A. Equal to velocity ratio of a gear train

B. Reciprocal of velocity ratio of a gear train

C. Always greater than unity

D. Always less than unity

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4

The acceleration of a particle moving with simple harmonic motion, at any instant is given by

A. ωx

B. ω²x

C. ω²/x

D. ω³/x

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4

Which one of the following can completely balance several masses revolving in different planes on a shaft?

A. A single mass in different planes

B. Two masses in any two planes

C. A single mass in one of the planes of the revolving masses

D. Two equal masses in any two planes

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4

In higher pair, the relative motion is

A. Purely turning

B. Purely sliding

C. Purely rotary

D. Combination of sliding and turning

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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

In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is

A. 95 mm

B. Slightly less than 95 mm

C. Slightly more than 95 mm

D. 45 mm

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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 a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

A. P = W tan(α - φ)

B. P = W tan(α + φ)

C. P = W tan(φ - α)

D. P = W cos(α + φ)

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4

The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.

A. Inner edge

B. Outer edge

C. Corners

D. None of these

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4

Throw of a cam is the maximum distance of the follower from

A. Base circle

B. Pitch circle

C. Root circle

D. Prime circle

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4

In railway axle boxes, the bearing used is

A. Deep groove ball bearing

B. Double row self aligning ball bearing

C. Double row spherical roller bearing

D. Cylindrical roller bearing