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Current Affairs January 2024

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4

For a bevel gear having the pitch angle θ, the ratio of formative number of teeth (TE) to actual number of teeth (T) is

A. 1/sinθ

B. 1/cosθ

C. 1/tanθ

D. sinθ cosθ

Correct Answer :

B. 1/cosθ


Related Questions

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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

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

In block brakes, the ratio of shoe width to wheel diameter is taken between

A. 0.1 and 0.25

B. 0.25 and 0.50

C. 0.50 and 0.75

D. 0.75 and 1

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4

The backlash for spur gears depends upon

A. Module

B. Tooth profile

C. Both module and pitch line velocity

D. Pitch line velocity

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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

In leaf springs, the longest leaf is known as

A. Master leaf

B. Lower leaf

C. Upper leaf

D. None of these

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4

The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

A. 12

B. 14

C. 18

D. 24

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4

A key way lowers

A. The strength of the shaft

B. The rigidity of the shaft

C. Both the strength and rigidity of the shaft

D. The ductility of the shaft

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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

Coaxing is the procedure of increasing

A. Metal strength by cycling

B. Metal hardness by surface treatment

C. Metal resistance to corrosion by coating

D. Fatigue limit by overstressing the metal by successively increasing loadings

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4

Silver based solder is used for

A. Flaring

B. Brazing

C. Soft soldering

D. Fusion welding

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4

The sleeve or muff coupling is designed as a

A. Dun cylinder

B. Hollow shaft

C. Solid shaft

D. Thick cylinder

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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

The velocity factor for ordinary cut gears operating at velocities upto 12.5 m/s is equal to

A. 0.75/ (0.75 + √v)

B. 3/ (3 + v)

C. 4.5/ (4.5 + v)

D. 6/ (6 + v)

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4

The shock resistance of steel is increased by adding

A. Nickel

B. Chromium

C. Nickel and chromium

D. Cobalt and molybdenum

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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

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

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 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

Which of the following is not correct procedure to increase the fatigue limit?

A. Cold working

B. Shot peening

C. Surface decarburisation

D. Under stressing

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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

In case of thick cylinders, the tangential stress across the thickness of cylinder is

A. Maximum at the outer surface and minimum at the inner surface

B. Maximum at the inner surface and minimum at the outer surface

C. Maximum at the inner surface and zero at the outer surface

D. Maximum at the outer surface and zero at the inner surface

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4

The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

A. (Kf + 1)/ (Kt + 1)

B. (Kf - 1)/ (Kt - 1)

C. (Kt + 1)/ (Kf + 1)

D. (Kt - 1)/ (Kf - 1)

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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

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 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

The velocity of sliding ________ the distance of the point of contact from the pitch point.

A. Is directly proportional to

B. Is inversely proportional to

C. Is equal to cos φ multiplied by

D. Does not depend upon

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4

Yield point in fatigue loading as compared to static loading is

A. Same

B. Higher

C. Lower

D. Depends on other factors

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4

In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

A. d

B. 1.5 d

C. 2.5 d

D. 2 d

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4

The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

A. One-fourth

B. One-third

C. One-half

D. Double