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Current Affairs January 2024

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4

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

A. Butt weld

B. Fillet weld

C. Sleeve weld

D. Socket weld

Correct Answer :

A. Butt weld


Related Questions

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4

Wahl's stress factor __________ very rapidly as the spring index decreases.

A. Increases

B. Decreases

C. Remain same

D. None of these

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4

The suitable material for belt used in flour mill is

A. Leather

B. Rubber

C. Canvas or cotton duck

D. Balata gum

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4

In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

A. Increase the key length

B. Increase the key depth

C. Increase the key width

D. Decrease the key length

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4

If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

A. Increases

B. Decreases

C. Remains unchanged

D. None of these

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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

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

The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

A. 0.45

B. 0.55

C. 0.65

D. 0.75

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4

Cap 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 parts

D. Provided with detachable caps

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4

The rivet head used for boiler plate riveting is usually

A. Pan Head

B. Snap head

C. Counter sunk head

D. Conical head

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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

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4

The endurance limit of a material with finished surface in comparison to rough surface is

A. More

B. Less

C. Same

D. More or less depending on quantum of load

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4

The maximum normal stress theory is used for

A. Plastic materials

B. Brittle materials

C. Non-ferrous materials

D. Ductile materials

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4

When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Bending stress

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4

In a flange coupling, the flanges are coupled together by means of

A. Bolts and nuts

B. Studs

C. Headless taper bolts

D. None of these

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4

Stress concentration in static 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

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

The permissible stress for carbon steel under static loading is generally taken as

A. 2000-3000 kg/m²

B. 3000-4000 kg/cm²

C. 4000-4500 kg/cm²

D. 7500-10,000 kg/cm²

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4

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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4

The efficiency of a square threaded screw is maximum if the helix angle is equal to (Where φ = Angle of friction)

A. 90° - φ

B. 45° - φ

C. 45° - φ/2

D. 45° + φ/2

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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 number of slots in a 25 mm castle nut is

A. 8

B. 6

C. 4

D. 2

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4

The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

A. Working depth

B. Clearance

C. Backlash

D. Face width

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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

If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

A. T sec3φ

B. T sec²φ

C. T/sec3φ

D. T cosecφ

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4

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

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4

In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)

A. d + 17 mm

B. 2d + 13 mm

C. 2d + 20 mm

D. 3.5d

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4

If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

A. Maximum principal stress theory

B. Maximum shear stress theory

C. Maximum strain energy theory

D. Maximum distortion energy theory

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4

The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

A. Reducing stress concentration

B. Ease of manufacture

C. Safety

D. Fullering and caulking

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4

A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

A. 2.5

B. 2.8

C. 3.0

D. 3.5

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4

In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.

A. Thick film

B. Thin film

C. Either A or B

D. None of these