4

Less than

Equal to

More than

None of these

A. Less than

4

8

12

18

20

4

Two shafts will have equal strength, if

Diameter of both the shafts is same

Angle of twist of both the shafts is same

Material of both the shafts is same

Twisting moment of both the shafts is same

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

P1 - P2

P1 + P2

2 × (P1 + P2)

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

4

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

Half

Same

Double

None of the above

4

(6V/ π)1/2

(6V/ π)1/3

(6V/ π)2

(6V/ π)3

4

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

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

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

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

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

4

The angle of twist of shaft is

Directly proportional to (shaft diameter)²

Inversely proportional to (shaft diameter)²

Directly proportional to (shaft diameter)⁴

Inversely proportional to (shaft diameter)⁴

4

The application of third type levers is found in

Handle of a hand pump

Hand wheel of a punching press

Lever of a loaded safety valve

A pair of tongs

4

The face of the tooth is the

Surface of the top of the tooth

Surface of the tooth above the pitch surface

Surface of the tooth below the pitch surface

Width of the tooth measured along the pitch circle

4

4F/ πd²

6F/ πd²

8F/ πd²

16F/ 3πd²

4

The contact ratio for gears is

Zero

Less than one

Greater than one

None of these

4

Same

Higher

Lower

Depends on other factors

4

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

Larger

Smaller

Equal

Larger/smaller depending on diameter of spring coil

4

Leather

Rubber

Cotton duck

Balata gum

4

4

8

6

4

2

4

Taper on the cotter and slot is provided

On both the sides

On one side only

On none of the sides

May be provided anywhere

4

T/2

T

2T

4T

4

The connecting rod bolts are tightened up so that tightening stress

Is just sufficient to hold parts together

Approaches yield point

Is 50% of yield point

Is about yield point divided by safety factor

4

Counter shaft

Line shaft

All of these

4

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

Reduce vibration

Reduce slip

Ensure proper alignment

4

Rankine's theory is used for

Brittle materials

Ductile materials

Elastic materials

Plastic materials

4

Maximum principal stress theory is applicable for

Ductile materials

Brittle materials

Elastic materials

All of the above

4

A machine part subjected to __________ is called a strut.

An axial compressive force

A tangential force

An axial tensile force

Any one of these

4

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

Helical compression spring

Spiral spring

Torsion spring

Belleville spring

4

In hydrodynamic bearings

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

The oil film is maintained by supplying oil under pressure

Do not require external supply of lubricant

Grease is used for lubrication

4

Shear stress theory is applicable for

Ductile materials

Brittle materials

Elastic materials

All of the above

4

4

Which of the following statement is correct regarding power screws?

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

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

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

(A) and (B) Only