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Current Affairs January 2024

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4

In order to obtain bolt of uniform strength

A. Increase shank diameter

B. Increase its length

C. Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

D. Tighten die bolt properly

Correct Answer :

C. Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread


Related Questions

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4

Which of the following statement is correct?

A. The distance from a point on one thread to the corresponding point on the next thread is called pitch

B. The distance which a screw thread advances axially in one rotation of the nut is called lead

C. In single start threads, lead is equal to pitch

D. All of the above

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4

The cross-section of the arm of a bell crank lever is

A. Rectangular

B. Elliptical

C. I-section

D. Any one of these

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4

Tapered roller bearings can take

A. Axial load only

B. Both radial and axial loads and the ratio of these being greater than unity

C. Radial load only

D. Both radial and axial loads and the ratio of these being less than unity

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4

Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

A. Dynamic loading

B. Static loading

C. Combined static and dynamic loading

D. Completely reversed loading

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4

The size of a cam depends upon

A. Base circle

B. Pitch circle

C. Prime circle

D. Pitch curve

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4

The elasticity is the property of a material which enables it to

A. Regains its original shape after deformation when the external forces are removed

B. Draw into wires by the application of a tensile force

C. Resists fracture due to high impact loads

D. Retain deformation produced under load permanently

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4

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

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

The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

A. Heavier

B. Lighter

C. Moderate

D. None of these

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4

Transverse fillet welded joints are designed for

A. Tensile strength

B. Compressive strength

C. Shear strength

D. Bending strength

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4

The wire ropes make contact at

A. Bottom of groove of the pulley

B. Sides and bottom of groove of the pulley

C. Anywhere in the groove of the pulley

D. Sides of groove of the pulley

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4

Which is positive drive?

A. Flat belt drive

B. V-belt drive

C. Crossed belt drive

D. Timing belt

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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 creep in the belt is due to

A. Effect of temperature on belt

B. Material of belt

C. Unequal extensions in the belt due to tight and slack side tensions

D. Stresses beyond elastic limit of belt material

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4

According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

A. 45 to 60 %

B. 63 to 70 %

C. 70 to 83 %

D. 80 to 90 %

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4

If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

A. 0.2

B. 0.25

C. 0.50

D. 0.6

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4

In a multiple V-belt drive, if one of the belts break, then

A. Only the broken belt is replaced

B. The entire set of belts is replaced

C. The broken belt and the belt on either side of it, is replaced

D. The broken belt need not to be replaced

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4

Which one of the following loading is considered for the design of axles?

A. Bending moment only

B. Twisting moment only

C. Combined bending moment and twisting moments

D. Combined action of bending moment, twisting moment and axial thrust

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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

The square threads are usually found on

A. Spindles of bench vices

B. Railway carriage couplings

C. Feed mechanism of machine tools

D. Screw cutting lathes

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4

In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called

A. Normal pitch

B. Axial pitch

C. Diametral pitch

D. Module

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4

Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

A. F + P

B. F P

C. P

D. F

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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

In skew bevel gearing, the axes of shafts are

A. Intersecting and the teeth are curved

B. Non-intersecting and nonparallel and the teeth are curved

C. Non-intersecting and non-parallel and the teeth are straight

D. None of the above

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4

According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

A. Equating tearing resistance of the plate to the shearing resistance of the rivets

B. Equating tearing resistance of the plate to the crushing resistance of the rivets

C. Equating shearing resistance to the crushing resistance of the rivets

D. None of the above

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4

The number of slots in a 25 mm castle nut is

A. 8

B. 4

C. 2

D. 6

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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

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 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

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