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4

An open belt drive is used when

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

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

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

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

Correct Answer :

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


Related Questions

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4

Jam nut is a locking device in which

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. A slot is cut partly in middle of nut and then slot reduced by tightening a screw

C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

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4

The distribution of the forces along the length of key fitted in a shaft

A. Varies linearly

B. Is uniform throughout

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

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

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4

The endurance limit of a material with finished surface in comparison to rough surface is

A. More

B. Less

C. Same

D. More or less depending on quantum of load

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4

Which of the following statement is correct?

A. A parallel sunk key is a taperless key

B. A parallel sunk key may be rectangular or square in cross-section

C. A flat saddle key is a taper key which fits in a key way of the hub and is flat on the shaft

D. All of the above

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4

The material commonly used for crane hooks is

A. Cast iron

B. Wrought iron

C. Mild steel

D. Aluminium

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4

A locking device extensively used in marine type connecting rod ends is a

A. Jam nut

B. Castle nut

C. Sawn nut

D. Ring nut

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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

In the levers of first type, the mechanical advantage is __________ one.

A. Less than

B. Equal to

C. More than

D. None of these

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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

The load cup of a screw jack is made separate from the head of the spindle to

A. Prevent the rotation of load being lifted

B. Enhance the load carrying capacity of the jack

C. Reduce the effort needed for lifting the working load

D. Reduce the value of frictional torque

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4

In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

A. Decreasing the cross-section area of bar

B. Increasing the cross-section area of bar

C. Remain unaffected with cross-section area

D. Would depend upon other factors

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4

A double fillet welded joint with parallel fillet weld of length l and leg s is subjected to a tensile force P. Assuming uniform stress distribution, the shear stress in the weld is given by

A. √2P/s.l

B. P/2.s.l

C. P/√2.s.l

D. 2P/s.l

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4

A screw is said to be over hauling screw, if its efficiency is

A. More than 50 %

B. Less than 50 %

C. Equal to 50 %

D. None of these

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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 ratio of driving tensions in V-belt drives is __________ flat belt drives.

A. Equal to

B. sinα times more than

C. sinα times less than

D. cosecα times more than

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4

A screw is said to be over hauling screw, if the

A. Friction angle is less than helix angle

B. Friction angle is more than helix angle

C. Friction angle is equal to helix angle

D. Efficiency of screw is 100%

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4

The plasticity is the property of a material which enables it to

A. Regain its original shape after deformation when the external forces are removed

B. Draw into wires by the application of a tensile force

C. Resist fracture due to high impact loads

D. Retain deformation produced under load permanently

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4

Resistance to fatigue of a material is measured by

A. Young's modulus

B. Coefficient of elasticity

C. Elastic limit

D. Endurance limit

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4

A screw is said to be a self locking screw, if its efficiency is

A. Less than 50 %

B. More than 50 %

C. Equal to 50 %

D. None of these

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4

According to Indian standard specifications, 100 H6/g5 means that the

A. Basic size is 100 mm

B. Actual size is 100 mm

C. Difference between the actual size and basic size is 100 mm

D. None of the above

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4

When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A. Bending stress only

B. A combination of torsional shear stress and bending

C. Direct shear stress only

D. A combination of bending stress and direct shear stress

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4

The objective of crowning of the flat pulleys of belt drive is to

A. Prevent the belt from running off the pulley

B. Increase the power transmission capacity

C. Increase the belt velocity

D. Prevent the belt joint from damaging the belt surface

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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

Multiple threads are used to secure

A. Low efficiency

B. High efficiency

C. High load lifting capacity

D. High mechanical advantage

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4

The notch angle of the Izod impact test specimen is

A. 10°

B. 20°

C. 30°

D. 45°

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4

The size of a cam depends upon

A. Base circle

B. Pitch circle

C. Prime circle

D. Pitch curve

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4

The number of slots in a 25 mm castle nut is

A. 8

B. 6

C. 4

D. 2

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4

The maximum efficiency of a square threaded screw is

A. (1 - sinφ)/ (1 + sinφ)

B. (1 + sinφ)/ (1 - sinφ)

C. (1 - sinφ)/ (1 + cosφ)

D. (1 + cosφ)/ (1 - sinφ)

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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

The maximum bending stress in a curved beam having symmetrical section always occur at the

A. Centroidal axis

B. Neutral axis

C. Inside fibre

D. Outside fibre