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In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

A. Right hand

B. Left hand

C. Both A and B

D. None of these

Correct Answer :

B. Left hand


Related Questions

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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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The rolling contact bearings are known as

A. Thick lubricated bearings

B. Plastic bearings

C. Antifriction bearings

D. Thin lubricated bearings

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Buttress threads are usually found on

A. Screw cutting lathes

B. Feed mechanisms

C. Spindles of bench vices

D. Railway carriage couplings

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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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Rivets are generally specified by

A. Thickness of plates to be riveted

B. Length of rivet

C. Diameter of head

D. Nominal diameter

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In a journal bearing, the load on the bearing is __________ to the axis of the journal.

A. Parallel

B. Perpendicular

C. Both A and B

D. None of these

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The velocity factor for precision metallic gears cut with high accuracy and operating at velocities upto 20 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

When a hole of diameter d is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

A. d.t.τu

B. πd.t.τu

C. π/4 × d².τu

D. π/4 × d² × t.τu

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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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The contact ratio for gears is

A. Zero

B. Less than one

C. Greater than one

D. None of these

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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 piston pin bearings in heavy duty diesel engines are

A. Needle roller bearings

B. Tapered roller bearings

C. Spherical roller bearings

D. Cylindrical roller bearings

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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

A V-belt designated as B 4430 LP has

A. 4430 mm as diameter of small pulley

B. 4430 mm as nominal pitch length

C. 4430 mm as diameter of large pulley

D. 4430 mm as centre distance between pulleys

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4

Which of the following statement is correct?

A. The cold rolled shafting is stronger than hot rolled shafting

B. The hot rolled shafting is stronger than cold rolled shafting

C. The cold rolled and hot rolled shaftings are equally strong

D. The shafts are not made by rolling process

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4

According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

A. 0.5 mm upto rivet diameter of 24 mm

B. 1 mm for rivet diameter from 27 mm to 36 mm

C. 2 mm for rivet diameter from 39 mm to 48 mm

D. All of the above

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A stud

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. Has pointed threads

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4

If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to

A. [(√P1 + √P2)/2]²

B. P1 + P2

C. 2 × (P1 + P2)

D. [2 × (P1 + P2)] + Pc Where Pc is centrifugal tension

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The bearings of heavy series have capacity ________ over the medium series.

A. 20 to 30%

B. 10 to 20%

C. 30 to 40%

D. 40 to 50%

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Allen bolts are

A. Self locking bolts

B. Designed for shock load

C. Used in aircraft application

D. Provided with hexagonal depression in head

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Cold working

A. Increases the fatigue strength

B. Decreases the fatigue strength

C. Has no influence on fatigue strength

D. Alone has no influence on fatigue strength

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In a full 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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The contact ratio is the ratio of

A. Length of arc of recess to the circular pitch

B. Length of path of contact to the circular pitch

C. Length of arc of contact to the circular pitch

D. Length of arc of approach to the circular pitch

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For high speed engines, the cam follower should move with

A. Uniform velocity

B. Simple harmonic motion

C. Uniform acceleration and retardation

D. Cycloidal motion

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A fast and loose pulley drive is used when

A. Shafts are arranged parallel and rotate in the opposite directions

B. Shafts are arranged parallel and rotate in the same directions

C. Shafts are arranged at right angles and rotate in one definite direction

D. Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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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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For general industrial machinery, the ratio of the length of journal to its diameter is taken as

A. 0.5 to 1

B. 1 to 2

C. 3 to 5

D. 5 to 10

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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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A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

A. 5 N-m

B. 7 N-m

C. 10 N-m

D. 15 N-m

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The connecting rod bolts are tightened up with initial tension greater than the external load so that

A. Joint may not open up

B. Bolts are weakest elements

C. The resultant load on the bolt would not be affected by the external cyclic load

D. Bolts will not loosen during service