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4

The spring mostly used in gramophones is

A. Helical spring

B. Conical spring

C. Flat spiral spring

D. Volute spring

Correct Answer :

C. Flat spiral spring


Related Questions

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4

According to Indian standard specifications, a grey cast iron designated by 'FG 200' means that the

A. Carbon content is 2%

B. Maximum compressive strength is 200 N/mm²

C. Minimum tensile strength is 200 N/mm²

D. Maximum shear strength is 200 N/mm²

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4

Deep groove ball bearings are used for

A. Heavy thrust load only

B. Small angular displacement of shafts

C. Radial load at high speed

D. Combined thrust and radial loads at high speed

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4

The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

A. Plasticity

B. Elasticity

C. Ductility

D. Malleability

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4

For circumferential joint in boilers, the type of joint used is

A. Butt joint with single cover plate

B. Butt joint with double cover plate

C. Lap joint with one ring overlapping the other

D. Any one of the above

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4

In designing a connecting rod, it is considered like __________ for buckling about Y-axis.

A. Both ends hinged

B. Both ends fixed

C. One end fixed and the other end hinged

D. One end fixed and the other end free

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4

Yield point in fatigue loading as compared to static loading is

A. Same

B. Higher

C. Lower

D. Depends on other factors

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4

Aircraft body is usually fabricated by

A. Welding

B. Pre-casting

C. Riveting

D. Casting

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4

The shock resistance of steel is increased by adding

A. Nickel

B. Chromium

C. Nickel and chromium

D. Cobalt and molybdenum

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4

Belt slip may occur due to

A. Heavy load

B. Loose belt

C. Driving pulley too small

D. All of the above

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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

The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.

A. Increases

B. Decreases

C. Remain same

D. None of these

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4

The taper on key is given on

A. Bottom side only

B. Top side only

C. On both sides

D. Any side

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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

A double strap butt joint (with equal straps) is

A. Always in single shear

B. Always in double shear

C. Either in single shear or double shear

D. Any one of these

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4

Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

A. Brinell

B. Rockwell

C. Vickers

D. None of the above

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4

Which of the following pipe joints would be suitable for pipes carrying steam?

A. Flanged

B. Threaded

C. Bell and spigot

D. Expansion

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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 maximum normal stress theory is used for

A. Plastic materials

B. Brittle materials

C. Non-ferrous materials

D. Ductile materials

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4

Plastic flow in ductile materials

A. Increases the seriousness of static loading stress concentration

B. Lessens the seriousness of static loading stress concentration

C. Has no effect on it

D. Depends on other considerations

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4

The coefficient of friction between the belt and pulley depends upon the

A. Material of belt and pulley

B. Slip of belt

C. Speed of belt

D. All of these

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4

The effective stress in wire ropes during normal working is equal to the stress due to

A. Axial load plus stress due to bending

B. Acceleration/retardation of masses plus stress due to bending

C. Axial load plus stress due to acceleration/retardation

D. Bending plus stress due to acceleration/retardation

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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

A connecting rod subjected to an axial load may buckle with

A. X-axis as neutral axis

B. Y-axis as neutral axis

C. X-axis or Y-axis as neutral axis

D. Z-axis

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4

Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

A. Woodruff key

B. Feather key

C. Gib-head key

D. Tangent key

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4

If two springs are in parallel then their overall stiffness will be

A. Half

B. Same

C. Double

D. None of the above

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4

The number of slots in a 25 mm castle nut is

A. 8

B. 6

C. 4

D. 2

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4

Which of the following material has the maximum ductility?

A. Copper

B. Mild steel

C. Aluminium

D. Zinc

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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

The following type of nut is used with alien bolt

A. Hexagonal nut

B. Slotted nut

C. Castle nut

D. Any one of the above

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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