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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

Correct Answer :

C. More than


Related Questions

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4

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

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4

A connecting rod subjected to an axial load may buckle with

A. X-axis as neutral axis

B. Y-axis as neutral axis

C. X-axis or Y-axis as neutral axis

D. Z-axis

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4

A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be

A. (6V/ π)1/2

B. (6V/ π)1/3

C. (6V/ π)2

D. (6V/ π)3

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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

In order to remove internal stresses produced by hardening the steel, the process usually adopted is

A. Tempering

B. Normalising

C. Annealing

D. Spheroidising

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4

If a spring is cut down into two springs, the stiffness of cut springs will be

A. Half

B. Same

C. Double

D. None of the above

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4

Guest's theory of failure is applicable for following type of materials

A. Brittle

B. Ductile

C. Elastic

D. Plastic

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4

An alien bolt is

A. Self locking bolt

B. Same as stud

C. Provided with hexagonal depression in head

D. Used in high speed components

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4

The included angle between the sides of V-belt is

A. 40°

B. 45°

C. 38°

D. 60°

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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

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

When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

A. Crown bevel gears

B. Angular bevel gears

C. Mitre gears

D. Internal bevel gears

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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 draw of cotter need not exceed

A. 3 mm

B. 5 mm

C. 10 mm

D. 20 mm

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4

Whether any core is required in wire ropes

A. Yes

B. No

C. Sometimes

D. Rarely

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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 a hydrodynamic lubricated bearing

A. There is a thick film of lubricant between the journal and the bearing

B. There is a thin film of lubricant between the journal and the bearing

C. The lubricant is forced between the journal and the bearing, by external pressure

D. There is no lubricant between the journal and the bearing

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4

The following type of nut is used with alien bolt

A. Hexagonal nut

B. Slotted nut

C. Castle nut

D. Any one of the above

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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

The material commonly used for machine tool bodies is

A. Mild steel

B. Aluminium

C. Brass

D. Cast iron

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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

Which of the following statement is correct for gears?

A. The pitch circle diameter is equal to the product of module and number of teeth

B. The addendum is less than dedendum

C. The pitch circle is always greater than the base circle

D. All of the above

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4

Cap screws are

A. Similar to small size tap bolts except that a greater variety of shapes of heads are available

B. Slotted for a screw driver and generally used with a nut

C. Used to prevent relative motion between parts

D. Provided with detachable caps

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4

If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

A. Square

B. Acme

C. Buttress

D. BSW

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4

A hollow saddle key is

A. A taper key which fits half in the key way of hub and half in the key way of shaft

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

C. A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

D. Provided in pairs at right angles and each key is to withstand torsion in one direction only

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4

Which is positive drive?

A. Flat belt drive

B. V-belt drive

C. Crossed belt drive

D. Timing belt

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4

In case of V-belt drive

A. The belt should touch the bottom of groove in the pulley

B. The belt should not touch the bottom of groove in the pulley

C. The belt should not touch the sides of groove in the pulley

D. None of the above

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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

In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

A. Remains constant at all speeds

B. Is minimum at zero speed and increases monotonically with increase in speed

C. Is maximum at zero speed and decreases monotonically with increase in speed

D. Becomes minimum at an optimum speed and then increases with further increase in speed

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4

The wire ropes make contact at

A. Bottom of groove of the pulley

B. Sides and bottom of groove of the pulley

C. Anywhere in the groove of the pulley

D. Sides of groove of the pulley