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Current Affairs January 2024

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4

Which of the following cotter joint will be used to connect strap end of a connecting rod?

A. Spigot and socket cotter joint

B. Sleeve and cotter joint

C. Gib and cotter joint

D. Any one of these

Correct Answer :

C. Gib and cotter joint


Related Questions

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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

Auto frettage is the method of

A. Joining thick cylinders

B. Calculating stresses in thick cylinders

C. Pre-stressing thick cylinders

D. Increasing the life of thick cylinders

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4

When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A. Bending stress only

B. A combination of torsional shear stress and bending

C. Direct shear stress only

D. A combination of bending stress and direct shear stress

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4

The fatigue stress concentration factor is defined as

A. The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

B. The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

C. The product of the endurance limits with and without stress concentration

D. All of the above

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4

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

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

Lewis form factor for 14 ½° composite and full depth involute system is (where T = Number of teeth)

A. 0.124 - (0.684/T)

B. 0.154 - (0.912/T)

C. 0.175 - (0.841/T)

D. None of these

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4

Wire ropes as compared to cotton ropes

A. Are lighter in weight

B. Offer silent operation

C. Can withstand shock loads

D. All of these

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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

When the belt is transmitting maximum power, the belt speed should be

A. √(Pmax / 2m)

B. √(Pmax / 3m)

C. √(Pmax / m)

D. √(3m /Pmax) Where m = mass of belt per metre (kg/m) Pmax = maximum permissible tension in belt (N)

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4

The number of slots in a 25 mm castle nut is

A. 8

B. 6

C. 4

D. 2

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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

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

A. (WD/ πd3) × K

B. (2WD/ πd3) × K

C. (4WD/ πd3) × K

D. (8WD/ πd3) × K

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4

Which of the following statement is wrong?

A. The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets

B. The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole

C. The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm

D. According to I.B.R., the thickness of butt strap shall not be less than 5 mm

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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

The shear plane in case of bolts should

A. Be across threaded portion of shank

B. Be parallel to axis of bolt

C. Be normal to threaded portion of shank

D. Never be across the threaded portion

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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

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

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

A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be

A. (6V/ π)1/2

B. (6V/ π)1/3

C. (6V/ π)2

D. (6V/ π)3

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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

Stress concentration in cyclic loading is more serious in

A. Ductile materials

B. Brittle materials

C. Equally serious in both cases

D. Depends on other factors

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4

A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

A. 2000 N-m

B. 2050 N-m

C. 2100 N-m

D. 2136 N-m

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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

Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

A. p.d.σt

B. p.t.σt

C. (p - d) σt

D. (p - d) t.σt

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4

Which of the following statement is correct?

A. The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials

B. The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials

C. The toughness of a material increases when it is heated

D. The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres

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4

The ratio of driving tensions in V-belt drives is __________ flat belt drives.

A. Equal to

B. sinα times more than

C. sinα times less than

D. cosecα times more than

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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

A hot short metal is

A. Brittle when cold

B. Brittle when hot

C. Brittle under all conditions

D. Ductile at high temperature

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4

The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is

A. ½

B. 1

C. 2

D. 4