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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

Correct Answer :

D. [4c²/(1 + 2c)] (m + M) g.h


Related Questions

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4

The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

A. n = 3(l - 1) - 2j - h

B. n = 2(l - 1) -2j - h

C. n = 3(l - 1) - 3j - h

D. n = 2(l - 1) - 3j - h

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4

The Klein's method of construction for reciprocating engine mechanism

A. Is a simplified version of instantaneous centre method

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

C. Enables determination of coriolis component

D. Is based on the acceleration diagram

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4

When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

A. Lower pair

B. Higher pair

C. Self-closed pair

D. Force-closed pair

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4

Which of the following is an inversion of Single slider crank chain?

A. Beam engine

B. Rotary engine

C. Oldhams coupling

D. Elliptical trammel

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4

The length of a simple pendulum which gives the same frequency as the compound pendulum, is

A. kG + l₁

B. kG² + l₁

C. (kG² + l₁²)/ l₁

D. (kG + l₁²)/ l₁

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4

In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The gear train usually employed in clocks is a

A. Simple gear train

B. Reverted gear train

C. Sun and planet gear

D. Differential gear

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4

The coriolis component of acceleration leads the sliding velocity by

A. 45°

B. 90°

C. 135°

D. 180°

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4

A higher pair has__________.

A. Point contact

B. Surface contact

C. No contact

D. None of the above

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4

A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)

A. P = W tan α

B. P = W tan (α + φ)

C. P = W (sin α + μ cos α)

D. P = W (cos α + μ sin α)

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4

The advantage of the piston valve over the slide valve is that in the former case

A. Wear is less

B. Power absorbed is less

C. Both wear and power absorbed are low

D. The pressure developed being high provides tight sealing

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4

The example of higher pair is

A. Belt, rope and chain drives

B. Gears, cams

C. Ball and roller bearings

D. All of the above

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4

For fluctuating loads, well suited bearing is

A. Ball bearing

B. Roller bearing

C. Needle roller bearing

D. Thrust bearing

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4

The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.

A. One-third

B. Two-third

C. Double

D. Three times

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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

If some links are connected such that motion between them can take place in more than one direction, it is called

A. Incompletely constrained motion

B. Partially constrained motion

C. Completely constrained motion

D. Successfully constrained motion

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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

In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

A. Minimise the effect of primary forces

B. Minimise the effect of secondary forces

C. Have perfect balancing

D. To start the locomotive quickly

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4

Which of the following is a turning pair?

A. Piston and cylinder of a reciprocating steam engine

B. Shaft with collars at both ends fitted into a circular hole

C. Lead screw of a lathe with nut

D. Ball and a socket joint

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4

Which gear train is used for higher velocity ratios in a small space?

A. Simple gear train

B. Compound gear train

C. Reverted gear train

D. Epicyclic gear train

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4

The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

A. Same

B. Different

C. Unpredictable

D. None of these

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4

The maximum or minimum value of the swaying couple is

A. ± c.m.ω².r

B. ± a (1 - c) m.ω².r

C. ± (a/√2) (1 - c) m.ω².r

D. ± 2a (1 - c) m.ω².r

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4

A mechanism is an assemblage of

A. Two links

B. Three links

C. Four or more than four links

D. All of these

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4

The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

A. 12

B. 14

C. 18

D. 24

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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

The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

A. ωR cosθ

B. ω(R - r₁) cosθ

C. ω(R - r₁) sinθ

D. ωr₁ sinθ

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4

In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by

A. μ₁ = μ sinβ

B. μ₁ = μ cosβ

C. μ₁ = μ/sinβ

D. μ₁ = μ/cosβ

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4

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

A. (1/2) μ W R cosec α

B. (2/3) μ W R cosec α

C. (3/4) μ W R cosec α

D. μ W R cosec α

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4

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 maximum fluctuation of speed is the

A. Difference of minimum fluctuation of speed and the mean speed

B. Difference of the maximum and minimum speeds

C. Sum of maximum and minimum speeds

D. Variations of speed above and below the mean resisting torque line