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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

Correct Answer :

C. Medium carbon steel


Related Questions

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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

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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4

A transmission shaft includes

A. Over head shaft

B. Counter shaft

C. Line shaft

D. All of these

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4

In composite or reverse laid ropes

A. Direction of twist of wires in strands is opposite to the direction of twist of strands

B. Direction of twist of wires and strands are same

C. Wires in two adjacent strands are twisted in opposite direction

D. Wires are not twisted

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4

A bolt of uniform strength can be developed by

A. Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

B. Keeping the core diameter smaller than the diameter of the unthreaded portion

C. Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

D. None of the above

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4

In a partial 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

A connecting rod should be

A. Strong in buckling about X-axis

B. Strong in buckling about Y-axis

C. Equally strong in buckling about X-axis and Y-axis

D. Any one of the above

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4

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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4

A leaf spring in automobiles is used

A. To apply forces

B. To measure forces

C. To absorb shocks

D. To store strain energy

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4

The connecting rod bolts are tightened up so that tightening stress

A. Is just sufficient to hold parts together

B. Approaches yield point

C. Is 50% of yield point

D. Is about yield point divided by safety factor

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4

Crushing resistance required to crush the rivet per pitch length is

A. p.d.σc

B. p.t.σc

C. n.d.t.σc

D. (p - d) t.σc

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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 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

When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

A. 0.20

B. 0.35

C. 0.50

D. 0.65

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4

In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

A. Helix angle

B. Pressure angle

C. Pitch lead angle

D. None of these

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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

A bolt is designed on the basis of __________ with a large factor of safety.

A. Direct tensile stress

B. Direct compressive stress

C. Direct bending stress

D. Direct shear stress

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4

Which of the following pipe joints would be suitable for pipes carrying steam?

A. Flanged

B. Threaded

C. Bell and spigot

D. Expansion

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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

In designing a key, it is assumed that the distribution of forces along the length of key

A. Varies linearly

B. Is uniform throughout

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

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

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4

In a gear, having Involute teeth, the normal to the Involute is a tangent to the

A. Base circle

B. Pitch circle

C. Addendum circle

D. Dedendum circle

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4

A coupling used to connect two perfectly aligned shafts, is

A. Muff coupling

B. Compression coupling

C. Flange coupling

D. All 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

The edges of a boiler plate are bevelled to an angle of

A. 30°

B. 45°

C. 60°

D. 80°

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4

The static tooth load should be __________ the dynamic load.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The face of the tooth is the

A. Surface of the top of the tooth

B. Surface of the tooth above the pitch surface

C. Surface of the tooth below the pitch surface

D. Width of the tooth measured along the pitch circle

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4

Fibrous fracture occurs in

A. Ductile material

B. Brittle material

C. Elastic material

D. Hard material

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4

In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

A. Larger than

B. Smaller than

C. Equal to

D. None of these

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4

A crankshaft is a __________ shaft.

A. Transmission

B. Machine

C. Machine frame

D. None of these

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4

Factor of safety for fatigue loading is the ratio of

A. Elastic limit to the working stress

B. Elastic limit to the yield point

C. Endurance limit to the working stress

D. Young's modulus to the ultimate tensile strength