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4

The creep in the belt is due to

A. Effect of temperature on belt

B. Material of belt

C. Unequal extensions in the belt due to tight and slack side tensions

D. Stresses beyond elastic limit of belt material

Correct Answer :

C. Unequal extensions in the belt due to tight and slack side tensions


Related Questions

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4

A sliding bearing which operates without any lubricant present, is called

A. Zero film bearing

B. Boundary lubricated bearing

C. Hydrodynamic lubricated bearing

D. Hydrostatic lubricated bearing

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4

Which is correct statement?

A. A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

B. A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

C. Both will be equally rigid

D. Which one is rigid will depend on several other factors

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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

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 helix angle for double helical gears may be made up to

A. 45°

B. 60°

C. 75°

D. 90°

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4

Taper usually provided on cotter is

A. 1 in 5

B. 1 in 10

C. 1 in 24

D. 1 in 40

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4

Applications in which stresses are encountered in one direction only uses following type of threads

A. Metric

B. Buttress

C. Acme

D. Square

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4

A coupling used to connect two perfectly aligned shafts, is

A. Muff coupling

B. Compression coupling

C. Flange coupling

D. All of these

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4

When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A. Bending stress only

B. A combination of torsional shear stress and bending

C. Direct shear stress only

D. A combination of bending stress and direct shear stress

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4

When spring index increases, the value of Wahl's stress factor

A. Increases linearly

B. Decreases linearly

C. Remains same

D. Increases exponentially

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4

Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

A. p.d.σt

B. p.t.σt

C. (p - d) σt

D. (p - d) t.σt

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4

In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

A. d

B. 1.5 d

C. 2.5 d

D. 2 d

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4

A type of brake commonly used in motor cars is a

A. Shoe brake

B. Band and block brake

C. Band brake

D. Internal expanding brake

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4

In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

A. Right hand

B. Left hand

C. Both A and B

D. None of these

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4

Fibrous fracture occurs in

A. Ductile material

B. Brittle material

C. Elastic material

D. Hard material

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4

The application of third type levers is found in

A. Handle of a hand pump

B. Hand wheel of a punching press

C. Lever of a loaded safety valve

D. A pair of tongs

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4

If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

A. Diameter of bolt

B. 0.75 × diameter of bolt

C. 1.25 × diameter of bolt

D. 1.5 × diameter of bolt

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4

Oldham coupling is used to connect two shafts

A. Which are perfectly aligned

B. Which are not in exact alignment

C. Which have lateral misalignment

D. Whose axes intersect at a small angle

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4

The gears are termed as medium velocity gears, if their peripheral velocity is

A. 1-3 m/s

B. 3-15 m/s

C. 15-30 m/s

D. 30-50 m/s

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4

A hot short metal is

A. Brittle when cold

B. Brittle when hot

C. Brittle under all conditions

D. Ductile at high temperature

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4

In hydrodynamic bearings

A. The oil film pressure is generated only by the rotation of the journal

B. The oil film is maintained by supplying oil under pressure

C. Do not require external supply of lubricant

D. Grease is used for lubrication

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4

The load cup of a screw jack is made separate from the head of the spindle to

A. Prevent the rotation of load being lifted

B. Enhance the load carrying capacity of the jack

C. Reduce the effort needed for lifting the working load

D. Reduce the value of frictional torque

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4

18/8 steel contains

A. 18% nickel and 8% chromium

B. 18% chromium and 8% nickel

C. 18% nickel and 8% vanadium

D. 18% vanadium and 8% nickel

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4

Cap screws are

A. Similar to small size tap bolts except that a greater variety of shapes of heads are available

B. Slotted for a screw driver and generally used with a nut

C. Used to prevent relative motion between parts

D. Provided with detachable caps

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4

A localised compressive stress at the area of contact between two members is known as

A. Bending stress

B. Shear stress

C. Tensile stress

D. Bearing stress

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4

Idler pulley is used for

A. Increasing velocity ratio

B. For applying tension

C. Changing the direction of motion of belt

D. All of these

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4

The washer is generally specified by its

A. Outer diameter

B. Hole diameter

C. Thickness

D. Mean diameter

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4

An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load W. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

A. One-eighth

B. One-fourth

C. One-half

D. Double

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4

Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.

A. Elastic strength

B. Yield strength

C. Shear strength

D. None of these

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4

Stress concentration in static loading is more serious in

A. Ductile materials

B. Brittle materials

C. Equally serious in both cases

D. Depends on other factors