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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

Correct Answer :

C. Equating shearing resistance to the crushing resistance of the rivets


Related Questions

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Belt slip may occur due to

A. Heavy load

B. Loose belt

C. Driving pulley too small

D. All of the above

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When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

A. Axially upwards

B. Axially downwards

C. Axially upwards or downwards

D. None of these

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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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For circumferential joint in boilers, the type of joint used is

A. Butt joint with single cover plate

B. Butt joint with double cover plate

C. Lap joint with one ring overlapping the other

D. Any one of the above

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While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

A. Both the ends fixed

B. Both the ends hinged

C. One end fixed and the other end hinged

D. One end fixed and the other end free

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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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A crankshaft is a __________ shaft.

A. Transmission

B. Machine

C. Machine frame

D. None of these

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The angle of twist of shaft is

A. Directly proportional to (shaft diameter)²

B. Inversely proportional to (shaft diameter)²

C. Directly proportional to (shaft diameter)⁴

D. Inversely proportional to (shaft diameter)⁴

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A spring is used to

A. Measure forces

B. Apply forces

C. Store energy

D. All of these

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In the levers of third type, the mechanical advantage is __________ one.

A. Less than

B. Equal to

C. More than

D. None of these

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In skew bevel gearing, the axes of shafts are

A. Intersecting and the teeth are curved

B. Non-intersecting and nonparallel and the teeth are curved

C. Non-intersecting and non-parallel and the teeth are straight

D. None of the above

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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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An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called

A. Addendum circle

B. Dedendum circle

C. Pitch circle

D. Clearance circle

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When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

A. Have contact at the bottom most of the bearing

B. Move towards right of the bearing making no metal to metal contact

C. Move towards right of the bearing making the metal to metal contact

D. Move towards left of the bearing making metal to metal contact

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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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The dedendum is the radial distance from the

A. Pitch circle to the top of a tooth

B. Pitch circle to the bottom of a tooth

C. Top of a tooth to the bottom of a tooth

D. Addendum circle to the clearance circle

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4

For same pulley diameters, center distance, belt speed and belt and pulley materials,

A. Open belt drive transmits more power than crossed belt drive

B. Crossed belt drive transmits more power than open belt drive

C. Open and crossed belt drives transmit same power

D. Power transmission does not depend upon open and crossed types of constructions

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4

Which is correct statement?

A. A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

B. A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

C. Both will be equally rigid

D. Which one is rigid will depend on several other factors

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The lower deviation is the algebraic difference between the

A. Actual size and the corresponding basic size

B. Maximum limit and the basic size

C. Minimum limit and the basic size

D. None of the above

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4

The objective of crowning of the flat pulleys of belt drive is to

A. Prevent the belt from running off the pulley

B. Increase the power transmission capacity

C. Increase the belt velocity

D. Prevent the belt joint from damaging the belt surface

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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

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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A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

A. There are four rivets per pitch length, all in double shear

B. There are four rivets per pitch length, out of which two are in single shear and two are in double shear

C. There are five rivets per pitch length, all in double shear

D. There are five rivets per pitch length, out of which four are in double shear and one is in single shear

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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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A key capable of tilting in a recess milled out in a shaft is known as

A. Woodruff key

B. Feather key

C. Flat saddle key

D. Hollow saddle key

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The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.

A. Increases

B. Decreases

C. Remain same

D. None of these

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Machine 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 two parts

D. Similar to stud

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4

The valve rod in a steam engine is connected to an eccentric rod by

A. Cotter joint

B. Bolted joint

C. Knuckle joint

D. Universal coupling

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The included angle between the sides of V-belt is

A. 40°

B. 45°

C. 38°

D. 60°

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

A. Equal to

B. Less than

C. Greater than

D. None of these