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4

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

A. Less than

B. Equal to

C. More than

D. None of these

Correct Answer :

A. Less than


Related Questions

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4

According to Indian standards, total numbers of tolerance grades are

A. 8

B. 12

C. 18

D. 20

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4

Two shafts will have equal strength, if

A. Diameter of both the shafts is same

B. Angle of twist of both the shafts is same

C. Material of both the shafts is same

D. Twisting moment of both the shafts is same

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4

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

A. P1 - P2

B. P1 + P2

C. 2 × (P1 + P2)

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

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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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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

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

A. Tolerance grade for the hole is 6 and for the shaft is 5

B. Tolerance grade for the shaft is 6 and for the hole is 5

C. Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7

D. Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7

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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

The application of third type levers is found in

A. Handle of a hand pump

B. Hand wheel of a punching press

C. Lever of a loaded safety valve

D. A pair of tongs

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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

When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

A. 4F/ πd²

B. 6F/ πd²

C. 8F/ πd²

D. 16F/ 3πd²

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4

The contact ratio for gears is

A. Zero

B. Less than one

C. Greater than one

D. None of these

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4

Yield point in fatigue loading as compared to static loading is

A. Same

B. Higher

C. Lower

D. Depends on other factors

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4

The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

A. Larger

B. Smaller

C. Equal

D. Larger/smaller depending on diameter of spring coil

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4

The suitable material for belt in agricultural machinery is

A. Leather

B. Rubber

C. Cotton duck

D. Balata gum

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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

The number of slots in a 25 mm castle nut is

A. 8

B. 6

C. 4

D. 2

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4

Taper on the cotter and slot is provided

A. On both the sides

B. On one side only

C. On none of the sides

D. May be provided anywhere

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4

The bending moment M and a torque T is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then M is equal to

A. T/2

B. T

C. 2T

D. 4T

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4

The connecting rod bolts are tightened up so that tightening stress

A. Is just sufficient to hold parts together

B. Approaches yield point

C. Is 50% of yield point

D. Is about yield point divided by safety factor

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4

A transmission shaft includes

A. Over head shaft

B. Counter shaft

C. Line shaft

D. All of these

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4

In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

A. Reduce vibration

B. Reduce slip

C. Ensure uniform loading

D. Ensure proper alignment

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4

Rankine's theory is used for

A. Brittle materials

B. Ductile materials

C. Elastic materials

D. Plastic materials

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4

Maximum principal stress theory is applicable for

A. Ductile materials

B. Brittle materials

C. Elastic materials

D. All of the above

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4

A machine part subjected to __________ is called a strut.

A. An axial compressive force

B. A tangential force

C. An axial tensile force

D. Any one of these

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4

Which of the following spring is used in mechanical wrist watch?

A. Helical compression spring

B. Spiral spring

C. Torsion spring

D. Belleville spring

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4

In hydrodynamic bearings

A. The oil film pressure is generated only by the rotation of the journal

B. The oil film is maintained by supplying oil under pressure

C. Do not require external supply of lubricant

D. Grease is used for lubrication

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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 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

Which of the following statement is correct regarding power screws?

A. The efficiency of a self locking screw can not be more than 50%

B. The efficiency of Acme (trapezoidal) thread is less than that of a square thread

C. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

D. (A) and (B) Only

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4

The stress induced in the belt is,

A. Tensile stress

B. Compressive stress

C. Direct shear stress

D. Torsional shear stress