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

B. 1.875 × (π/4) d² × τ × n

4

Jam nut

Castle nut

Sawn nut

Ring nut

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

2/8

8/2

4/8

8/4

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

# Lewis form factor for 14 ½° composite and full depth involute system is (where T = Number of teeth)

0.124 - (0.684/T)

0.154 - (0.912/T)

0.175 - (0.841/T)

None of these

4

Butt weld

Fillet weld

Sleeve weld

Socket weld

4

# In worm, gears, pitch lead angle is

Half the angle between two inclined faces in axial plane

The angle between the tangent to the pitch helix and the plane of rotation

The angle between the tangent to the pitch helix and an element of the cylinder

None of the above

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

p.d.σc

p.t.σc

n.d.t.σc

(p - d) t.σc

4

1 in 5

1 in 10

1 in 24

1 in 40

4

d

1.25 d

1.5 d

1.75 d

4

# Cast iron pipes are mainly used

For conveying steam

In water and sewage systems

In pressure lubrication systems on prime movers

All of the above

4

# The design of shafts made of brittle materials is based on

Guest's theory

Rankine's theory

St Venant's theory

Von Mises theory

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

Neutral surface

Upper surface

Lower surface

None of these

4

Helix angle

Pressure angle

None of these

4

Metric

Square

Buttress

Acme

4

# In most machine members, the damping capacity of the material should be

Low

Zero

High

Could be anything

4

# The objective of caulking in a riveted joint is to make the joint

Free from corrosion

Stronger in tension

Free from stress

Leak-proof

4

Brittle

Ductile

Elastic

Plastic

4

# An open belt drive is used when

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

Shafts are arranged parallel and rotate in the opposite directions

Shafts are arranged parallel and rotate in the same directions

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

4

More

Less

Same

None of these

4

# The coefficient of friction in belt drive depends upon

Material of belt

Material of pulley

Materials of belt and pulley

Belt velocity

4

# The rated life of a bearing varies

Inversely as fourth power of load

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

Decreasing the cross-section area of bar

Increasing the cross-section area of bar

Remain unaffected with cross-section area

Would depend upon other factors

4

# The temperature at which the new grains are formed in the metal is known as

Lower critical temperature

Upper critical temperature

Recrystallisation temperature

None of these

4

Zero

Less than one

Greater than one

None of these

4

Dedendum

Clearance

Working depth

4

# Shear stress theory is applicable for

Ductile materials

Brittle materials

Elastic materials

All of the above