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4

The gears are termed as medium velocity gears, if their peripheral velocity is

A. 1-3 m/s

B. 3-15 m/s

C. 15-30 m/s

D. 30-50 m/s

Correct Answer :

B. 3-15 m/s


Related Questions

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4

The piston rod of a steam engine is usually connected to the crosshead by means of

A. Bolted joint

B. Knuckle joint

C. Cotter joint

D. Universal joint

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4

In unilateral system of tolerance, the tolerance is allowed on

A. Both sides of the actual size

B. One side of the actual size

C. One side of the nominal size

D. Both sides of the nominal size

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4

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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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

The centrifugal tension in belts

A. Decreases the power transmitted

B. Increases the power transmitted

C. Increase the wrap angle

D. Increases the belt tension without increasing power transmission

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4

Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

A. Woodruff key

B. Feather key

C. Gib-head key

D. Tangent key

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4

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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4

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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4

Eulers formula for a mild steel column is not valid if the slenderness ratio is

A. 90

B. 60

C. 120

D. 100

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4

When spring index increases, the value of Wahl's stress factor

A. Increases linearly

B. Decreases linearly

C. Remains same

D. Increases exponentially

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4

The pitch of threads on a Jock nut in comparison to pitch of nut is

A. Same

B. Coarser

C. Finer

D. Very fine

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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

In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

A. d

B. 1.25 d

C. 1.5 d

D. 1.75 d

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4

The flank of the tooth is the

A. Surface of the top of the tooth

B. Surface of the tooth above the pitch surface

C. Width of the tooth measured along the pitch circle

D. Surface of the tooth below the pitch surface

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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

In case of pressure vessels having open ends, the fluid pressure induces

A. Longitudinal stress

B. Circumferential stress

C. Shear stress

D. None of these

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4

In the assembly of pulley, key and shaft

A. Pulley is made the weakest

B. Key is made the weakest

C. Key is made the strongest

D. All the three are designed for equal strength

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4

In testing a material for endurance strength, it is subjected to

A. Static load

B. Dynamic load

C. Impact load

D. Completely reversed load

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4

The acme threads are usually found on

A. Spindles of bench vices

B. Railway carriage couplings

C. Feed mechanism of machine tools

D. Screw cutting lathes

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4

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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4

In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.

A. Thick film

B. Thin film

C. Either A or B

D. None of these

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4

For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

A. 8

B. 6

C. 4

D. 10

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4

In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

A. Belts are available in sets

B. Only one belt cannot be fitted with other used belts

C. The new belt will carry more than its share and result in short life

D. New and old belts will cause vibrations

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4

The resultant axial load on a bolt depends upon

A. External load applied

B. Initial tension due to tightening of the bolt

C. Relative elastic yielding of the bolt and the connected members

D. All of the above

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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

A column of length l is fixed at both ends. The equivalent length of the column is

A. l/2

B. l/√2

C. l

D. 2 l

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4

Shear stress theory is applicable for

A. Ductile materials

B. Brittle materials

C. Elastic materials

D. All of the above

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4

In worm, gears, pitch lead angle is

A. Half the angle between two inclined faces in axial plane

B. The angle between the tangent to the pitch helix and the plane of rotation

C. The angle between the tangent to the pitch helix and an element of the cylinder

D. None of the above

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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

When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

A. Initial tension

B. External load applied

C. Sum of the initial tension and external load applied

D. Initial tension or external load, whichever is greater