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Current Affairs January 2024

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4

A spring is used to

A. Measure forces

B. Apply forces

C. Store energy

D. All of these

Correct Answer :

D. All of these


Related Questions

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4

The fatigue life of a part can be improved by

A. Electroplating

B. Polishing

C. Coating

D. Shot peening

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4

When compared to the rod of the same diameter and material, a wire rope

A. Is less flexible

B. Has a much smaller load carrying capacity

C. Does not provide much warning before failure

D. Provides much greater time for remedial action before failure

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4

Fabric belts are used in industrial applications because

A. They are cheap

B. They can work at high temperature

C. They are unaffected by moisture and humidity

D. None of the above

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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

Which of the following formula is used in designing a connecting rod?

A. Euler's formula

B. Rankine's formula

C. Johnson's straight line formula

D. Johnson's parabolic formula

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4

In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

A. Larger than

B. Smaller than

C. Equal to

D. None of these

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4

Gear box is used

A. To produce torque

B. For speed reduction

C. To obtain variable speeds

D. To increase efficiency of system

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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

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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The product of the diametral pitch and circular pitch is equal to

A. 1

B. 1/π

C. π

D. π × number of teeth

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4

A crankshaft is a __________ shaft.

A. Transmission

B. Machine

C. Machine frame

D. None of these

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4

Stress concentration factor is defined as the ratio of

A. Maximum stress to the endurance limit

B. Nominal stress to the endurance limit

C. Maximum stress to the nominal stress

D. Nominal stress to the maximum stress

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4

When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

A. Have contact at the bottom most of the bearing

B. Move towards right of the bearing making no metal to metal contact

C. Move towards right of the bearing making the metal to metal contact

D. Move towards left of the bearing making metal to metal contact

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4

The cam follower extensively used in aircraft engines is

A. Knife edge follower

B. Flat faced follower

C. Spherical faced follower

D. Roller follower

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4

Buttress threads are usually found on

A. Screw cutting lathes

B. Feed mechanisms

C. Spindles of bench vices

D. Railway carriage couplings

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The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

A. Repeated stress

B. Yield stress

C. Fluctuating stress

D. Alternating stress

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4

The shear stress at a point in a shaft subjected to a torque is

A. Directly proportional to the polar moment of inertia and to the distance of the point from the axis

B. Directly proportional to the applied torque and inversely proportional to the polar moment of inertia

C. Directly proportional to the applied torque and the polar moment of inertia

D. Inversely proportional to the applied torque and the polar moment of inertia

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4

The coefficient of friction in belt drive depends upon

A. Material of belt

B. Material of pulley

C. Materials of belt and pulley

D. Belt velocity

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4

In designing thick cylinders, the equation used is

A. Lame's equation

B. Birnie's equation

C. Clavarinos' equation

D. All of these

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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

When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

A. Angular bevel gears

B. Mitre gears

C. Internal bevel gears

D. Crown bevel gears

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4

The resilience of a bolt may be increased by

A. Increasing its shank diameter

B. Increasing its length

C. Decreasing its shank diameter

D. Decreasing its length

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4

When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

A. Axially upwards

B. Axially downwards

C. Axially upwards or downwards

D. None of these

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4

A chain drive transmits __________ power as compared to belt drive.

A. More

B. Less

C. Same

D. None of these

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4

The size of a gear is usually specified by

A. Pressure angle

B. Pitch circle diameter

C. Circular pitch

D. Diametral pitch

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4

The efficiency of a square threaded screw is maximum if the helix angle is equal to (Where φ = Angle of friction)

A. 90° - φ

B. 45° - φ

C. 45° - φ/2

D. 45° + φ/2

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4

Eulers formula for a mild steel column is not valid if the slenderness ratio is

A. 90

B. 60

C. 120

D. 100

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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 composite or reverse laid ropes

A. Direction of twist of wires in strands is opposite to the direction of twist of strands

B. Direction of twist of wires and strands are same

C. Wires in two adjacent strands are twisted in opposite direction

D. Wires are not twisted

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4

Which of the following statement is correct for gears?

A. The pitch circle diameter is equal to the product of module and number of teeth

B. The addendum is less than dedendum

C. The pitch circle is always greater than the base circle

D. All of the above