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Current Affairs January 2024

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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

Correct Answer :

B. Brittle when hot


Related Questions

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4

Buttress threads are usually found on

A. Screw cutting lathes

B. Feed mechanisms

C. Spindles of bench vices

D. Railway carriage couplings

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4

Coaxing is the procedure of increasing

A. Metal strength by cycling

B. Metal hardness by surface treatment

C. Metal resistance to corrosion by coating

D. Fatigue limit by overstressing the metal by successively increasing loadings

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4

The arms of the pulleys for flat belt drive have

A. Elliptical cross-section

B. Major axis in plane of rotation

C. Major axis twice the minor axis

D. All the three characteristics

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4

An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

A. Increasing the length of bar

B. Decreasing the cross-sectional area of the bar

C. Decreasing the modulus of elasticity of the bar

D. All of the above

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4

The yield point in static loading is __________ as compared to fatigue loading.

A. Higher

B. Lower

C. Same

D. None of these

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4

Antifriction bearings are

A. Sleeve bearings

B. Hydrodynamic bearings

C. Thin lubricated bearings

D. None of the above

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4

Two shafts will have equal strength, if

A. Diameter of both the shafts is same

B. Angle of twist of both the shafts is same

C. Material of both the shafts is same

D. Twisting moment of both the shafts is same

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4

Cast iron pipes are mainly used

A. For conveying steam

B. In water and sewage systems

C. In pressure lubrication systems on prime movers

D. All of the above

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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

In standard taper roller bearings, the angle of taper of outer raceway is

A.

B.

C. 15°

D. 25°

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4

Stress concentration factor is defined as the ratio of

A. Maximum stress to the endurance limit

B. Nominal stress to the endurance limit

C. Maximum stress to the nominal stress

D. Nominal stress to the maximum stress

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4

In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

A. d

B. 1.5 d

C. 2.5 d

D. 2 d

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4

The form factor of a helical gear __________ with the increase in the helix angle.

A. Increases

B. Decreases

C. Remains constant

D. None of these

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4

The smallest diameter of an external or internal screw thread is known as

A. Minor diameter

B. Major diameter

C. Pitch diameter

D. None of these

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4

The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

A. 1420 d

B. 1680 d

C. 2080 d

D. 2840 d

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4

When the belt is transmitting maximum power,

A. The tension in tight side is twice the centrifugal tension

B. The tension in slack side is equal to the centrifugal tension

C. The tension in tight side is thrice the centrifugal tension

D. None of the above

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4

The washer is generally specified by its

A. Outer diameter

B. Hole diameter

C. Thickness

D. Mean diameter

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4

The draw of cotter need not exceed

A. 3 mm

B. 5 mm

C. 10 mm

D. 20 mm

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4

Maximum principal stress theory is applicable for

A. Ductile materials

B. Brittle materials

C. Elastic materials

D. All of the above

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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

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 pitch of threads on a Jock nut in comparison to pitch of nut is

A. Same

B. Coarser

C. Finer

D. Very fine

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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

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4

A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

A. 3.6 N/mm² compression

B. 3.6 N/mm² tension

C. 7.2 N/mm² compression

D. 7.2 N/mm² tension

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4

The coefficient of friction in belt drive depends upon

A. Material of belt

B. Material of pulley

C. Materials of belt and pulley

D. Belt velocity

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4

The shock absorbing capacity of a bolt may be increased by

A. Increasing its shank diameter

B. Decreasing its shank diameter

C. Tightening the bolt properly

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

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4

A steel containing __________ 0.8% carbon is known as hypoeutectoid steel.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

In a gear, having Involute teeth, the normal to the Involute is a tangent to the

A. Base circle

B. Pitch circle

C. Addendum circle

D. Dedendum circle

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4

Allen bolts are

A. Self locking bolts

B. Designed for shock load

C. Used in aircraft application

D. Provided with hexagonal depression in head

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4

The resistance to fatigue of a material is measured by

A. Elastic limit

B. Ultimate tensile strength

C. Young's modulus

D. Endurance limit