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What is the correct answer?

4

The included angle in unified of American National threads is

A. 60°

B. 55°

C. 47°

D. 29°

Correct Answer :

A. 60°


Related Questions

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4

When two springs are in series (having stiffness K), the equivalent stiffness will be

A. K

B. K/2

C. 2K

D. K/4

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4

For unequal width of butt straps, the thicknesses of butt straps are

A. 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

B. 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside

C. 0.75 t for both the straps on the inside and outside

D. 0.625 t for both the straps on the inside and outside

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4

The ratio of pitch circle diameter in millimetres to the number of teeth, is called

A. Circular pitch

B. Diametral pitch

C. Module

D. None of these

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4

A hollow saddle key is

A. A taper key which fits half in the key way of hub and half in the key way of shaft

B. A taper key which fits in a key way of the hub and is flat on the shaft

C. A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

D. Provided in pairs at right angles and each key is to withstand torsion in one direction only

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4

The ball bearings are provided with a cage

A. To reduce friction

B. To facilitate slipping of balls

C. To prevent the lubricant from flowing out

D. To maintain the balls at a fixed distance apart

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4

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

A. Thread

B. Middle

C. Shank

D. Head

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4

Which process will increase the fatigue duration of parts?

A. Finishing and polishing

B. Shotpeening

C. De-carburisation

D. Electroplating

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4

Which is correct statement? Stress concentration in cyclic loading is

A. Very serious in brittle materials and less serious in ductile materials

B. Very serious in ductile materials and less serious in brittle materials

C. Equally serious in both types of materials

D. Seriousness would depend on other factors

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4

The ball bearings are, usually, made from

A. Low carbon steel

B. High carbon steel

C. Medium carbon steel

D. High speed steel

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4

In designing thick cylinders, the equation used is

A. Lame's equation

B. Birnie's equation

C. Clavarinos' equation

D. All of these

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4

The helix angle for double helical gears may be made up to

A. 45°

B. 60°

C. 75°

D. 90°

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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

A locking device extensively used in marine type connecting rod ends is a

A. Jam nut

B. Castle nut

C. Sawn nut

D. Ring nut

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4

The distribution of the forces along the length of key fitted in a shaft

A. Varies linearly

B. Is uniform throughout

C. Varies exponentially, being more near the torque-input end

D. Varies exponentially, being less near the torque-input end

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4

A universal coupling is used to connect two shafts

A. Which are not in exact alignment

B. Which are perfectly aligned

C. Whose axes intersect at a small angle

D. Have lateral misalignment

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4

A connecting rod subjected to an axial load may buckle with

A. X-axis as neutral axis

B. Y-axis as neutral axis

C. X-axis or Y-axis as neutral axis

D. Z-axis

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4

The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

A. It is subjected to a higher cyclic loading than the outer side

B. It is subjected to a higher stress than the outer side

C. It is more stretched than the outer side during the manufacturing process

D. It has a lower curvature than the outer side

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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

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

The stretching in a belt can be controlled by __________ the stress in the belt.

A. Reducing

B. Increasing

C. Both A and B

D. None of these

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4

The coefficient of friction between the belt and pulley depends upon the

A. Material of belt and pulley

B. Slip of belt

C. Speed of belt

D. All of these

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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 creep in the belt is due to

A. Effect of temperature on belt

B. Material of belt

C. Unequal extensions in the belt due to tight and slack side tensions

D. Stresses beyond elastic limit of belt material

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4

A tube has the following advantage over pipe

A. Lighter and easier to handle

B. Greater shock absorption

C. Smoother inside walls

D. All of the above

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4

The draw of cotter should not be more than

A. 3 mm

B. 6 mm

C. 8 mm

D. 12 mm

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4

Screws used for power transmission should have

A. Very fine threads

B. High efficiency

C. Low efficiency

D. Strong teeth

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4

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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4

The taper on key is given on

A. Bottom side only

B. Top side only

C. On both sides

D. Any side

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4

For maximum power, the velocity of the belt will be

A. √(T/m)

B. √(T/2m)

C. √(T/3m)

D. None of these

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4

In designing a connecting rod, it is considered like __________ for buckling about Y-axis.

A. Both ends hinged

B. Both ends fixed

C. One end fixed and the other end hinged

D. One end fixed and the other end free