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4

Wahl's stress factor __________ very rapidly as the spring index decreases.

A. Increases

B. Decreases

C. Remain same

D. None of these

Correct Answer :

A. Increases


Related Questions

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4

The expansion joint is mostly used for pipes which carry steam at __________ pressures.

A. Low

B. High

C. Medium

D. None of these

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4

In a marine flange coupling, the thickness of flange is taken as

A. d/2

B. d/3

C. 3d/4

D. d/4

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4

For tight leakage joints, following type of thread is best suited

A. Metric

B. Buttress

C. Square

D. NPT (national pipe threads)

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4

Residual stress in materials

A. Acts when external load is applied

B. Becomes zero when external load is removed

C. Is independent of external loads

D. Is always harmful

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4

Castle nut is a locking device in which

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. A slot is cut partly is middle of nut and then slot reduced by tightening a screw

C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

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4

The stress induced in the belt is,

A. Tensile stress

B. Compressive stress

C. Direct shear stress

D. Torsional shear stress

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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

The sleeve or muff coupling is designed as a

A. Dun cylinder

B. Hollow shaft

C. Solid shaft

D. Thick cylinder

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4

A hollow saddle key is

A. A taper key which fits half in the key way of hub and half in the key way of shaft

B. A taper key which fits in a key way of the hub and is flat on the shaft

C. A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

D. Provided in pairs at right angles and each key is to withstand torsion in one direction only

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4

A column is known as a long column if the slenderness ratio is

A. 40

B. 50

C. 70

D. 100

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4

In unilateral system of tolerance, the tolerance is allowed on

A. Both sides of the actual size

B. One side of the actual size

C. One side of the nominal size

D. Both sides of the nominal size

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4

Rankine's theory is used for

A. Brittle materials

B. Ductile materials

C. Elastic materials

D. Plastic materials

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4

A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

A. 5 N-m

B. 7 N-m

C. 10 N-m

D. 15 N-m

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4

The rolling contact bearings are known as

A. Thick lubricated bearings

B. Plastic bearings

C. Antifriction bearings

D. Thin lubricated bearings

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4

Which of the following statement is correct?

A. The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials

B. The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials

C. The toughness of a material increases when it is heated

D. The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres

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4

The centre to centre distance between two consecutive rivets in a row, is called

A. Margin

B. Pitch

C. Back pitch

D. Diagonal pitch

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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

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4

For high speed engines, the cam follower should move with

A. Uniform velocity

B. Simple harmonic motion

C. Uniform acceleration and retardation

D. Cycloidal motion

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4

Jam nut is a locking device in which

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. A slot is cut partly in middle of nut and then slot reduced by tightening a screw

C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

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4

A flange coupling is used to connect two shafts

A. Which are perfectly aligned

B. Which are not in exact alignment

C. Have lateral misalignment

D. Whose axes intersect at a small angle

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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

Split nut is a locking device in which

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. A slot is cut partly in middle of nut and then slot reduced by tightening screw

C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

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4

Allen bolts are

A. Self locking bolts

B. Designed for shock load

C. Used in aircraft application

D. Provided with hexagonal depression in head

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4

In radial bearings, the load acts __________ to the axis of rotation.

A. Parallel

B. Perpendicular

C. Both A and B

D. None of these

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4

A machine part subjected to __________ is called a strut.

A. An axial compressive force

B. A tangential force

C. An axial tensile force

D. Any one of these

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4

A screw is said to be over hauling screw, if its efficiency is

A. More than 50 %

B. Less than 50 %

C. Equal to 50 %

D. None of these

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4

In nitrated parts, the origins of the fatigue cracks will occur at

A. Surface

B. Just below the surface

C. Within the core

D. None of the above

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4

The objective of crowning of the flat pulleys of belt drive is to

A. Prevent the belt from running off the pulley

B. Increase the power transmission capacity

C. Increase the belt velocity

D. Prevent the belt joint from damaging the belt surface

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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

A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

A. 5 mm

B. 10 mm

C. 15 mm

D. 25 mm