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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

Correct Answer :

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


Related Questions

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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 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

The rated life of a bearing varies

A. Directly as load

B. Inversely as square of load

C. Inversely as cube of load

D. Inversely as fourth power of load

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4

Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.

A. Elastic strength

B. Yield strength

C. Shear strength

D. None of these

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4

In cross or regular lay 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

Two helical springs of the same material and of equal circular crosssection, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

A. W/2

B. 2W/3

C. W/9

D. 8W/9

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4

When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

A. Same

B. Double

C. One-half

D. One-fourth

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4

Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

A. Brinell

B. Rockwell

C. Vickers

D. None of the above

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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

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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4

When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

A. F/bh

B. 3F/2bh

C. 2F/bh

D. 4F/bh

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4

The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

A. εc + 2εl

B. c + εl

C. εc + εl²

D. εc² + εl

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4

In radial cams, the follower moves

A. In a direction parallel to the cam axis

B. In a direction perpendicular to the cam axis

C. In any direction irrespective of cam axis

D. Along the cam axis

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4

The function of cutting oil when threading a pipe is to

A. Provide cooling action

B. Lubricate the dies

C. Help removes chips

D. All of the above

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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

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 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

When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

A. Knuckle threads

B. Square threads

C. Acme threads

D. Buttress threads

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4

When the fulcrum is in between the load and effort, the lever is said to be of

A. First type

B. Second type

C. Third type

D. Any one of these

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4

According to Rankine's theory, the failure occurs at a point in a member

A. When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test

B. When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test

C. When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test

D. When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

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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

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4

Three different weights fall from a certain height under vacuum. They will take

A. Same time to reach earth

B. Times proportional to weight to reach earth

C. Times inversely proportional to weight to reach earth

D. None of the above

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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

For hardening alloy steels and high speed steels, they are heated to

A. 1100 to 1300°C

B. 1300 to 1500°C

C. 500 to 600°C

D. 700 to 900°C

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4

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

A tapered key which fits in a key-way in the hub and is flat on the shaft, is known as

A. Woodruff key

B. Feather key

C. Flat saddle key

D. Gib head key

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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

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

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

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