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4

In order to double the period of a simple pendulum, the length of the string should be

A. Halved

B. Doubled

C. Quadrupled

D. None of these

Correct Answer :

C. Quadrupled


Related Questions

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The partial balancing means

A. Balancing partially revolving masses

B. Balancing partially reciprocating masses

C. Best balancing of engines

D. All of these

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4

The cam and follower is an example of

A. Sliding pair

B. Rolling pair

C. Lower pair

D. Higher pair

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4

Bifilar suspension method is used to find the

A. Angular acceleration of the body

B. Moment of inertia of the body

C. Periodic time of the body

D. Frequency of vibration of the body

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4

In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines,

A. The algebraic sum of the primary forces must be equal to zero

B. The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero

C. Both (A) and (B)

D. None of these

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4

For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

A. Governor A is more sensitive than governor B

B. Governor B is more sensitive than governor A

C. Both governors A and B are equally sensitive

D. None of the above

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4

The steering of a ship means

A. Movement of a complete ship up and down in vertical plane about transverse axis

B. Turning of a complete ship in a curve towards right or left, while it moves forward

C. Rolling of a complete ship sideways

D. None of the above

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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 Klein's method of construction for reciprocating engine mechanism

A. Is based on acceleration diagram

B. Is a simplified form of instantaneous center method

C. Utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine

D. Enables determination of Carioles component

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4

When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions.

A. Same

B. Opposite

C. Perpendicular

D. None of these

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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

Angular acceleration of a link can be determined by dividing the

A. Centripetal component of acceleration with length of link

B. Tangential component of acceleration with length of link

C. Resultant acceleration with length of link

D. All of the above

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4

In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

A. 50°-60°

B. 60°-70°

C. 70°-80°

D. 80°-90°

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4

When a ship travels in a sea, which of the effect is more dangerous

A. Steering

B. Pitching

C. Rolling

D. All of the above

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4

The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

A. Pitch circle

B. Base circle

C. Pitch curve

D. Prime circle

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4

When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

A. [(r² + R²) cosφ]/2

B. [(r² + R²) sinφ]/2

C. [(r + R) cosφ]/2

D. [(r + R) sinφ]/2

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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

Which one of the following is an exact straight line mechanism using lower pairs?

A. Watts mechanism

B. Grasshopper mechanism

C. Roberts mechanism

D. Peaucelliers mechanism

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4

In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is

A. 12

B. 16

C. 25

D. 32

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The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

A. l₁ = kG

B. l₂ = kG

C. l₁l₂ = kG

D. l₁l₂ = kG²

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4

A pulley and belt in a belt drive form a

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair

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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

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

Klein's construction can be used to determine acceleration of various parts when the crank is at

A. Inner dead centre

B. Outer dead centre

C. Right angles to the link of the stroke

D. All of the above

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4

The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

A. Vertically and parallel

B. Vertically and perpendicular

C. Horizontally and parallel

D. Horizontally and perpendicular

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4

In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

A. x₁/x₂

B. log(x₁/x₂)

C. loge(x₁/x₂)

D. log(x₁.x₂)

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4

Cam angle is defined as the angle

A. During which the follower returns to its initial position

B. Of rotation of the cam for a definite displacement of the follower

C. Through which, the cam rotates during the period in which the follower remains in the highest position

D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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4

The lower pair is a

A. Open pair

B. Closed pair

C. Sliding pair

D. Point contact pair

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4

Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of a cross belt drive. The length of the belt is

A. π (r₁ + r₂) + [(r₁ + r₂)²/x] + 2x

B. π (r₁ + r₂) + [(r₁ - r₂)²/x] + 2x

C. π (r₁ - r₂) + [(r₁ - r₂)²/x] + 2x

D. π (r₁ - r₂) + [(r₁ + r₂)²/x] + 2x

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4

In a four stroke I.C. engine, the turning moment during the compression stroke is

A. Positive throughout

B. Negative throughout

C. Positive during major portion of the stroke

D. Negative during major portion of the stroke

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4

Pulley in a belt drive acts as

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair