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4

A double strap butt joint (with equal straps) is

A. Always in single shear

B. Always in double shear

C. Either in single shear or double shear

D. Any one of these

Correct Answer :

B. Always in double shear


Related Questions

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4

If two springs are in parallel then their overall stiffness will be

A. Half

B. Same

C. Double

D. None of the above

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4

Guest's theory of failure is applicable for following type of materials

A. Brittle

B. Ductile

C. Elastic

D. Plastic

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4

When compared to the rod of the same diameter and material, a wire rope

A. Is less flexible

B. Has a much smaller load carrying capacity

C. Does not provide much warning before failure

D. Provides much greater time for remedial action before failure

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4

A bolt

A. Has a head on one end and a nut fitted to the other

B. Has head at one end and other end fits into a tapped hole in the other part to be joined

C. Has both the ends threaded

D. Is provided with pointed threads

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4

The helix angle for single helical gears ranges from

A. 10° to 15°

B. 15° to 20°

C. 20° to 35°

D. 35° to 50°

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4

Which of the following statement is wrong?

A. A key is used as a temporary fastening

B. A key is subjected to tensile stresses

C. A key is always inserted parallel to the axis of the shaft

D. A key prevents relative motion between the shaft and boss of the pulley

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4

The stress in the threaded part of the bolt will be __________ as compared to the shank.

A. Same

B. Higher

C. Lower

D. None of these

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4

The crest diameter of a screw thread is same as

A. Major diameter

B. Minor diameter

C. Pitch diameter

D. Core diameter

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4

In a marine flange coupling, the thickness of flange is taken as

A. d/2

B. d/3

C. 3d/4

D. d/4

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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

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

Which of the following has threads at both ends?

A. Bolt

B. Tap bolt

C. Stud

D. None of these

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4

A screw is said to be over hauling screw, if the

A. Friction angle is less than helix angle

B. Friction angle is more than helix angle

C. Friction angle is equal to helix angle

D. Efficiency of screw is 100%

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4

The contact ratio for gears is

A. Zero

B. Less than one

C. Greater than one

D. None of these

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4

According to Indian standard specifications, 100 H6/g5 means that the

A. Basic size is 100 mm

B. Actual size is 100 mm

C. Difference between the actual size and basic size is 100 mm

D. None of the above

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4

Deep groove ball bearings are used for

A. Heavy thrust load only

B. Small angular displacement of shafts

C. Radial load at high speed

D. Combined thrust and radial loads at high speed

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4

In Vickers hardness testing, the pyramid indentor apex is

A. 40°

B. 122°

C. 136°

D. 152°

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4

In testing a material for endurance strength, it is subjected to

A. Static load

B. Dynamic load

C. Impact load

D. Completely reversed load

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4

According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

A. 45 to 60 %

B. 63 to 70 %

C. 70 to 83 %

D. 80 to 90 %

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4

When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

A. 10 times

B. 5 times

C. 15 times

D. 20 times

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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

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

In radial cams, the follower moves

A. In a direction parallel to the cam axis

B. In a direction perpendicular to the cam axis

C. In any direction irrespective of cam axis

D. Along the cam axis

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4

When the fulcrum is in between the load and effort, the lever is said to be of

A. First type

B. Second type

C. Third type

D. Any one of these

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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

A steel containing 0.8% carbon is known as

A. Eutectoid steel

B. Hypereutectoid steel

C. Hypo-eutectoid steel

D. None of these

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4

The property of a material which enables it to resist fracture due to high impact loads is known as

A. Elasticity

B. Endurance

C. Strength

D. Toughness

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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

For tight leakage joints, following type of thread is best suited

A. Metric

B. Buttress

C. Square

D. NPT (national pipe threads)

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4

Multiple threads are used to secure

A. Low efficiency

B. High efficiency

C. High load lifting capacity

D. High mechanical advantage