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4

The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to

A. 3 Pc

B. Pc

C. Pc/3

D. 2 Pc Where, Pc = tension in belt due to centrifugal force

Correct Answer :

A. 3 Pc


Related Questions

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4

In case of pressure vessels having open ends, the fluid pressure induces

A. Longitudinal stress

B. Circumferential stress

C. Shear stress

D. None of these

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4

Which process will increase the fatigue duration of parts?

A. Finishing and polishing

B. Shotpeening

C. De-carburisation

D. Electroplating

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4

The square threads are usually found on

A. Spindles of bench vices

B. Railway carriage couplings

C. Feed mechanism of machine tools

D. Screw cutting lathes

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4

A column of length l is fixed at both ends. The equivalent length of the column is

A. l/2

B. l/√2

C. l

D. 2 l

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4

For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

A. 0.4 times

B. 0.6 times

C. 0.7 times

D. 0.8 times

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4

The suitable material for belt used in flour mill is

A. Leather

B. Rubber

C. Canvas or cotton duck

D. Balata gum

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4

In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

A. Normal pitch

B. Axial pitch

C. Diametral pitch

D. Module

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4

The number of slots in a 25 mm castle nut is

A. 8

B. 4

C. 2

D. 6

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4

The contact ratio is the ratio of

A. Length of arc of recess to the circular pitch

B. Length of path of contact to the circular pitch

C. Length of arc of contact to the circular pitch

D. Length of arc of approach to the circular pitch

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4

The power transmitted by belt drive depends upon

A. Belt velocity

B. Initial belt tension

C. Arc of contact

D. All of the above

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4

A screw is said to be over hauling screw, if the

A. Friction angle is less than helix angle

B. Friction angle is more than helix angle

C. Friction angle is equal to helix angle

D. Efficiency of screw is 100%

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4

The shock absorbing capacity of a bolt may be increased by

A. Increasing its shank diameter

B. Decreasing its shank diameter

C. Tightening the bolt properly

D. Making the shank diameter equal to core diameter of thread

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4

When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

A. Initial tension

B. External load applied

C. Sum of the initial tension and external load applied

D. Initial tension or external load, whichever is greater

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4

According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

A. Equating tearing resistance of the plate to the shearing resistance of the rivets

B. Equating tearing resistance of the plate to the crushing resistance of the rivets

C. Equating shearing resistance to the crushing resistance of the rivets

D. None of the above

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4

The centrifugal tension in belts

A. Decreases the power transmitted

B. Increases the power transmitted

C. Increase the wrap angle

D. Increases the belt tension without increasing power transmission

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4

In a horizontal flat belt drive, it is customary to use

A. Bottom side of belt as slack side

B. Top side of belt as slack side

C. Idler pulley

D. None of the above

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4

In most machine members, the damping capacity of the material should be

A. Low

B. Zero

C. High

D. Could be anything

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4

In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

A. Reduce vibration

B. Reduce slip

C. Ensure uniform loading

D. Ensure proper alignment

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4

The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

A. p = D sin (90°/T)

B. p = D sin (120°/T)

C. p = D sin (180°/T)

D. p = D sin (360°/T)

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4

A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

A. Hollow saddle key

B. Hollow key

C. Soft key

D. None of these

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4

The temperature required for full annealing in hypereutectoid steel is

A. 50°C above upper critical temperature

B. 50°C below upper critical temperature

C. 50°C above lower critical temperature

D. 50°C below lower critical temperature

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4

According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

A. d = t

B. d = 1.6 t

C. d = 2t

D. d = 6t

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4

When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

A. Brown colour

B. Yellow colour

C. White colour

D. Grey colour

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4

Creep in belt is due to

A. Material of the belt

B. Material of the pulley

C. Uneven extensions and contractions due to varying tension

D. All of the above

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4

In worm, gears, pitch lead angle is

A. Half the angle between two inclined faces in axial plane

B. The angle between the tangent to the pitch helix and the plane of rotation

C. The angle between the tangent to the pitch helix and an element of the cylinder

D. None of the above

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4

A stud

A. Has a head on one end and a nut fitted to the other

B. Has head at one end and other end fits into a tapped hole in the other part to be joined

C. Has both the ends threaded

D. Has pointed threads

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4

The maximum shear stress theory is used for

A. Brittle materials

B. Ductile materials

C. Plastic materials

D. Nonferrous materials

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4

A connecting rod is designed as a

A. Long column

B. Short column

C. Strut

D. All of these

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4

The draw of cotter should not be more than

A. 3 mm

B. 6 mm

C. 8 mm

D. 12 mm

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4

If a bearing is designated by the number 305, it means that the bearing is of

A. Medium series whose bore is 5 mm

B. Medium series whose bore is 25 mm

C. Light series whose bore is 25 mm

D. Light series whose bore is 5 mm