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Current Affairs January 2024

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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

Correct Answer :

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


Related Questions

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4

The flank of the tooth is the

A. Surface of the top of the tooth

B. Surface of the tooth above the pitch surface

C. Width of the tooth measured along the pitch circle

D. Surface of the tooth below the pitch surface

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4

The ball bearings are, usually, made from

A. Low carbon steel

B. High carbon steel

C. Medium carbon steel

D. High speed steel

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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

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

When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

A. F/bh

B. 3F/2bh

C. 2F/bh

D. 4F/bh

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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

When the fulcrum is in between the load and effort, the lever is said to be of

A. First type

B. Second type

C. Third type

D. Any one of these

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4

In cylindrical cams, the follower moves

A. In a direction perpendicular to the cam axis

B. In a direction parallel to the cam axis

C. In any direction irrespective of cam axis

D. Along the cam axis

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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

Resilience of a material is important, when it is subjected to

A. Combined loading

B. Fatigue

C. Thermal stresses

D. Shock loading

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4

In worm gears, the pressure angle is ________ the angle between two inclined faces in axial plane.

A. Half

B. Twice

C. Thrice

D. None of these

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4

The material generally used for aircraft components is

A. Mild steel

B. High speed steel

C. Stainless steel

D. Aluminium

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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 taper on a rectangular sunk key is

A. 1 in 16

B. 1 in 32

C. 1 in 48

D. 1 in 100

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4

The process extensively used for making bolts and nuts is

A. Hot piercing

B. Extrusion

C. Cold peening

D. Cold heading

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4

Crowning on pulley helps

A. In decreasing the slip of the belt

B. In increasing the slip of the belt

C. To keep the belt in centre on a pulley while it is in motion

D. To increase pulley life

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4

Rivets are generally specified by

A. Thickness of plates to be riveted

B. Length of rivet

C. Diameter of head

D. Nominal diameter

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If a spring is cut down into two springs, the stiffness of cut springs will be

A. Half

B. Same

C. Double

D. None of the above

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In cross or regular lay 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

When two helical springs of equal lengths are arranged to form a cluster spring, then

A. Shear stress in each spring will be equal

B. Load taken by each spring will be half the total load

C. Only A is correct

D. Both A and B is correct

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4

The included angle for the British Association thread is

A. 29°

B. 55°

C. 47.3°

D. 60°

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4

When the belt speed increases

A. Power transmitted increases

B. Power transmitted decreases

C. Power transmitted increases to a maximum value and then decreases

D. Power transmitted remains the same

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4

A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

A. There are four rivets per pitch length, all in double shear

B. There are four rivets per pitch length, out of which two are in single shear and two are in double shear

C. There are five rivets per pitch length, all in double shear

D. There are five rivets per pitch length, out of which four are in double shear and one is in single shear

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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

In designing a connecting rod, it is considered like __________ for buckling about X-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

When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Bending stress

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4

In case of V-belt drive

A. The belt should touch the bottom of groove in the pulley

B. The belt should not touch the bottom of groove in the pulley

C. The belt should not touch the sides of groove in the pulley

D. None of the above

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4

A bench vice has following type of threads

A. Metric

B. Square

C. Buttress

D. Acme

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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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In the levers of third type, the mechanical advantage is __________ one.

A. Less than

B. Equal to

C. More than

D. None of these