4

Ductile materials

Brittle materials

Equally serious in both cases

Depends on other factors

A. Ductile materials

4

Elasticity

Endurance

Strength

Toughness

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

Less than

Equal to

More than

None of these

4

T₁/T₂ = μθ

log (T₁/T₂) = μθ

T₁/T₂ =eμθ

T₁/T₂ = log μθ

4

2.5

2.8

3.0

3.5

4

Woodruff key

Feather key

Tangent key

4

More than 50 %

Less than 50 %

Equal to 50 %

None of these

4

T sec3φ

T sec²φ

T/sec3φ

T cosecφ

4

4

# Which one of the following is a positive drive?

V-belt drive

Rope drive

Crossed flat belt drive

Chain drive

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

Fatigue

Thermal stresses

4

340 to 360

420 to 450

More than 400

300 to 320

4

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

Basic size is 100 mm

Actual size is 100 mm

Difference between the actual size and basic size is 100 mm

None of the above

4

# When the bolt is very yielding as compared to the connected members, 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

# 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

# Pick up wrong statement. Fatigue strength can be increased by

Cold working

Shot peening

Grinding and lapping surface

Hot working

4

F/bh

3F/2bh

2F/bh

4F/bh

4

# Fabric belts are used in industrial applications because

They are cheap

They can work at high temperature

They are unaffected by moisture and humidity

None of the above

4

Hollow key

Soft key

None of these

4

# Auto frettage is the method of

Joining thick cylinders

Calculating stresses in thick cylinders

Pre-stressing thick cylinders

Increasing the life of thick cylinders

4

Increases

Decreases

Remain same

None of these

4

Ring nut

Castle nut

Sawn nut

Jam nut

4

# The velocity factor for ordinary cut gears operating at velocities upto 12.5 m/s is equal to

0.75/ (0.75 + √v)

3/ (3 + v)

4.5/ (4.5 + v)

6/ (6 + v)

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

0.5 times

Equal to

2 times

Double

4

# Resistance to fatigue of a material is measured by

Young's modulus

Coefficient of elasticity

Elastic limit

Endurance limit

4

1.06

1.12

1.26

1.58

4

Normal pitch

Axial pitch

Diametral pitch

Module