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4

The objective of caulking in a riveted joint is to make the joint

A. Free from corrosion

B. Stronger in tension

C. Free from stress

D. Leak-proof

Correct Answer :

D. Leak-proof


Related Questions

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4

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

A. ZN/p

B. p/ZN

C. Z/pN

D. N/Zp

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4

In a full journal bearing, the angle of contact of the bearing with the journal is

A. 120°

B. 180°

C. 270°

D. 360°

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4

Which of the following statement is correct regarding power screws?

A. The efficiency of a self locking screw can not be more than 50%

B. The efficiency of Acme (trapezoidal) thread is less than that of a square thread

C. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

D. (A) and (B) Only

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4

The ratio of endurance limit in shear to the endurance limit in flexure is

A. 0.70

B. 0.25

C. 0.40

D. 0.55

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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

According to Indian standards, total numbers of fundamental deviations are

A. 10

B. 15

C. 20

D. 25

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4

The maximum shear stress theory is used for

A. Brittle materials

B. Ductile materials

C. Plastic materials

D. Nonferrous materials

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4

According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

A. (π/4) d² × τ × n

B. 1.875 × (π/4) d² × τ × n

C. 2 × (π/4) d² × τ × n

D. 3 × (π/4) d² × τ × n

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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 maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

A. Same in both cases

B. 2 times more

C. 3 times more

D. 4 times more

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4

The function of a washer is to

A. Provide cushioning effect

B. Provide bearing area

C. Absorb shocks and vibrations

D. Provide smooth surface in place of rough surface

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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

In a transverse fillet welded joint, the size of weld is __________ the throat of weld.

A. 0.5 times

B. Equal to

C. 2 times

D. Double

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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

A fast and loose pulley drive is used when

A. Shafts are arranged parallel and rotate in the opposite directions

B. Shafts are arranged parallel and rotate in the same directions

C. Shafts are arranged at right angles and rotate in one definite direction

D. Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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4

Oldham coupling is used to connect two shafts

A. Which are perfectly aligned

B. Which are not in exact alignment

C. Which have lateral misalignment

D. Whose axes intersect at a small angle

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4

According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the 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 rated life of a bearing varies

A. Directly as load

B. Inversely as square of load

C. Inversely as cube of load

D. Inversely as fourth power of load

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4

When two nonintersecting and non-coplanar shafts are connected by gears, the arrangement is known as

A. Spur gearing

B. Helical gearing

C. Bevel gearing

D. Spiral gearing

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4

The cold working of metals is carried out __________ the recrystallisation temperature.

A. Above

B. Below

C. At

D. None of these

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4

In oilness bearings

A. The oil film pressure is generated only by the rotation of the journal

B. The oil film is maintained by supplying oil under pressure

C. Do not require external supply of lubricant

D. Grease required to be applied after some intervals

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4

A self locking screw has

A. Fine threads

B. Course threads

C. Coefficient of friction is greater than tangent of load angle

D. Hole for inserting split pin

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4

Spring stiffness is

A. Ratio of coil diameter to wire diameter

B. Load required to produce unit deflection

C. Its capability of storing energy

D. Its ability to absorb shocks

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4

For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be

A. 4

B. 6

C. 8

D. 10

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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

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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 efficiency of a riveted joint is equal to

A. Pt /P

B. Ps /P

C. Pc /P

D. Least of Pt, Ps and Pc/P

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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

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

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