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4

A bolt of uniform strength can be developed by

A. Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

B. Keeping the core diameter smaller than the diameter of the unthreaded portion

C. Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

D. None of the above

Correct Answer :

A. Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt


Related Questions

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4

The notch angle of the Izod impact test specimen is

A. 10°

B. 20°

C. 30°

D. 45°

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4

The most important dimension in the design of a nut is

A. Pitch diameter

B. Inside diameter

C. Outside diameter

D. Height

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4

According to Indian standards, total numbers of tolerance grades are

A. 8

B. 12

C. 18

D. 20

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4

Split 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 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 splitted and bent in reverse direction at the other end

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4

According to Indian standards, total numbers of fundamental deviations are

A. 10

B. 15

C. 20

D. 25

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4

The belt slip occurs due to

A. Heavy load

B. Loose belt

C. Driving pulley too small

D. Any one of the above

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4

Machine screws are

A. Similar to small size tap bolts except that a greater variety of shapes of heads are available

B. Slotted for a screw driver and generally used with a nut

C. Used to prevent relative motion between two parts

D. Similar to stud

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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 shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

A. Larger

B. Smaller

C. Equal

D. Larger/smaller depending on diameter of spring coil

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4

A type of brake commonly used in motor cars is a

A. Shoe brake

B. Band and block brake

C. Band brake

D. Internal expanding brake

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4

The process which improves the machinability of steels, but lowers the hardness and tensile strength is

A. Normalising

B. Full annealing

C. Process annealing

D. Spheroidising

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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

An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called

A. Addendum circle

B. Dedendum circle

C. Pitch circle

D. Clearance circle

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4

The shock absorbing capacity of a bolt can be increased by

A. Tightening it properly

B. Increasing shank diameter

C. Grinding the shank

D. Making shank diameter equal to core diameter of thread.

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4

When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

A. Compression

B. Tension

C. Shear

D. Combined loads

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4

Applications in which stresses are encountered in one direction only uses following type of threads

A. Metric

B. Buttress

C. Acme

D. Square

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4

The design of shafts made of brittle materials is based on

A. Guest's theory

B. Rankine's theory

C. St Venant's theory

D. Von Mises theory

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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

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4

Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

A. (k₁ k₂)/ (k₁ + k₂)

B. (k₁ - k₂)/ (k₁ + k₂)

C. (k₁ + k₂)/ (k₁ k₂)

D. (k₁ - k₂)/ (k₁ k₂)

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4

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

In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

A. d

B. 1.25 d

C. 1.5 d

D. 1.75 d

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4

A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

A. Hollow saddle key

B. Hollow key

C. Soft key

D. None of these

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4

The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

A. εc + 2εl

B. c + εl

C. εc + εl²

D. εc² + εl

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4

A key capable of tilting in a recess milled out in a shaft is known as

A. Woodruff key

B. Feather key

C. Flat saddle key

D. Hollow saddle key

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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

If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

A. Diameter of bolt

B. 0.75 × diameter of bolt

C. 1.25 × diameter of bolt

D. 1.5 × diameter of bolt

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4

The velocity factor for ordinary cut gears operating at velocities upto 12.5 m/s is equal to

A. 0.75/ (0.75 + √v)

B. 3/ (3 + v)

C. 4.5/ (4.5 + v)

D. 6/ (6 + v)

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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

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

The power transmitted by belt drive depends upon

A. Belt velocity

B. Initial belt tension

C. Arc of contact

D. All of the above