4

Margin

Pitch

Back pitch

Diagonal pitch

B. Pitch

4

# Machine screws are

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

Slotted for a screw driver and generally used with a nut

Used to prevent relative motion between two parts

Similar to stud

4

# Form coefficient of spring is

Ratio of coil diameter to wire diameter

Load required to produce unit deflection

Its capability of storing energy

Concerned with strength of wire of spring

4

# In a hydrodynamic lubricated bearing

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

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

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

There is no lubricant between the journal and the bearing

4

120°

180°

270°

360°

4

# The efficiency of a riveted joint is equal to

Pt /P

Ps /P

Pc /P

Least of Pt, Ps and Pc/P

4

F/bh

3F/2bh

2F/bh

4F/bh

4

1 : 1

2 : 1

3 : 2

2 : 3

4

# When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

Initial tension

Sum of the initial tension and external load applied

Initial tension or external load, whichever is greater

4

6 m

5 m

7 m

All of these

4

# The expression 0.175 - 0.841/T is the Lewis form factor for

14 ½° composite and full depth involute system

20° full depth involute system

20° stub system

None of the above

4

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

Same time to reach earth

Times proportional to weight to reach earth

Times inversely proportional to weight to reach earth

None of the above

4

# According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

(π/4) d² × τ × n

1.875 × (π/4) d² × τ × n

2 × (π/4) d² × τ × n

3 × (π/4) d² × τ × n

4

# Rivets are generally specified by

Thickness of plates to be riveted

Length of rivet

Nominal diameter

4

Hot piercing

Extrusion

Cold peening

4

# The rolling contact bearings are known as

Thick lubricated bearings

Plastic bearings

Antifriction bearings

Thin lubricated bearings

4

# The resultant axial load on a bolt depends upon

Initial tension due to tightening of the bolt

Relative elastic yielding of the bolt and the connected members

All of the above

4

Same

Double

One-half

One-fourth

4

# In unilateral system of tolerance, the tolerance is allowed on

Both sides of the actual size

One side of the actual size

One side of the nominal size

Both sides of the nominal size

4

# A tube has the following advantage over pipe

Lighter and easier to handle

Greater shock absorption

Smoother inside walls

All of the above

4

30°

45°

60°

80°

4

# The stress induced in the belt is,

Tensile stress

Compressive stress

Direct shear stress

Torsional shear stress

4

# Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that

Shaft B is better than shaft A

Shaft A is better than shaft B

Both the shafts are equally good

None of these

4

# Which of the following formula is used in designing a connecting rod?

Euler's formula

Rankine's formula

Johnson's straight line formula

Johnson's parabolic formula

4

Low efficiency

High efficiency

Strong teeth

4

Effective

Smallest

Largest

None of these

4

# The elasticity is the property of a material which enables it to

Regains its original shape after deformation when the external forces are removed

Draw into wires by the application of a tensile force

Resists fracture due to high impact loads

Retain deformation produced under load permanently

4

# When the belt speed increases

Power transmitted increases

Power transmitted decreases

Power transmitted increases to a maximum value and then decreases

Power transmitted remains the same

4

Base circle

Pitch circle

Prime circle

Pitch curve

4

# Oldham coupling is used to connect two shafts

Which are perfectly aligned

Which are not in exact alignment

Which have lateral misalignment

Whose axes intersect at a small angle