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Current Affairs January 2024

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Which of the following coupling is used to connect two shafts which have both lateral and angular misalignment?

A. Bushed pin type coupling

B. Universal coupling

C. Oldham coupling

D. All of these

Correct Answer :

D. All of these


Related Questions

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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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When a hole of diameter d is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

A. d.t.τu

B. πd.t.τu

C. π/4 × d².τu

D. π/4 × d² × t.τu

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A feather key is generally

A. Loose in shaft and tight in hub

B. Tight in shaft and loose in hub

C. Tight in both shaft and hub

D. Loose in both shaft and hub

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A backing ring is used inside the pipe joint when making a

A. Butt weld

B. Fillet weld

C. Sleeve weld

D. Socket weld

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The pitch diameter is the __________ diameter of an external or internal screw thread.

A. Effective

B. Smallest

C. Largest

D. None of these

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When two nonintersecting and non-coplanar shafts are connected by gears, the arrangement is known as

A. Spur gearing

B. Helical gearing

C. Bevel gearing

D. Spiral gearing

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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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Taper on the cotter and slot is provided

A. On both the sides

B. On one side only

C. On none of the sides

D. May be provided anywhere

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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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Brittle coating technique is used for

A. Determining brittleness

B. Protecting metal against corrosion

C. Protecting metal against wear and tear

D. Experimental stress analysis

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When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

A. Same

B. Double

C. One-half

D. One-fourth

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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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Elastic nut is a locking device in which

A. One small 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. Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed 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 other end

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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

For maximum power, the velocity of the belt will be

A. √(T/m)

B. √(T/2m)

C. √(T/3m)

D. None of these

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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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A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

A. Ring nut

B. Castle nut

C. Sawn nut

D. Jam nut

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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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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

In case of thick cylinders, the tangential stress across the thickness of cylinder is

A. Maximum at the outer surface and minimum at the inner surface

B. Maximum at the inner surface and minimum at the outer surface

C. Maximum at the inner surface and zero at the outer surface

D. Maximum at the outer surface and zero at the inner surface

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In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

A. Belts are available in sets

B. Only one belt cannot be fitted with other used belts

C. The new belt will carry more than its share and result in short life

D. New and old belts will cause vibrations

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4

For longitudinal 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

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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The design of the pressure vessel is based on

A. Longitudinal stress

B. Hoop stress

C. Longitudinal and hoop stress

D. None of these

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Oil in journal bearing should be applied at the point where load is

A. Nil or lightest

B. Maximum

C. Average

D. Any one of the above

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If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

A. T₁ - T₂ + Tc

B. T₁ + T₂ + Tc

C. (T₁ - T₂ + Tc)/2

D. (T₁ + T₂ + Tc)/2

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Surface endurance limit of gear material is dependent upon its

A. Elastic strength

B. Yield strength

C. Brinell hardness number

D. Toughness

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A stud

A. Has a head on one end and a nut fitted to the other

B. Has head at one end and other end fits into a tapped hole in the other part to be joined

C. Has both the ends threaded

D. Has pointed threads

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A steel containing 0.8% carbon is known as

A. Eutectoid steel

B. Hypereutectoid steel

C. Hypo-eutectoid steel

D. None of these

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In a hydrodynamic lubricated bearing

A. There is a thick film of lubricant between the journal and the bearing

B. There is a thin film of lubricant between the journal and the bearing

C. The lubricant is forced between the journal and the bearing, by external pressure

D. There is no lubricant between the journal and the bearing