4

0.1 and 0.25

0.25 and 0.50

0.50 and 0.75

0.75 and 1

B. 0.25 and 0.50

4

1100 to 1300°C

1300 to 1500°C

500 to 600°C

700 to 900°C

4

# The design of the pressure vessel is based on

Longitudinal stress

Hoop stress

Longitudinal and hoop stress

None of these

4

# Lewis equation in gears is used to find the

Tensile stress in bending

Shear stress

Compressive stress in bending

Fatigue stress

4

Ductile materials

Brittle materials

Equally serious in both cases

Depends on other factors

4

# In composite or reverse laid ropes

Direction of twist of wires in strands is opposite to the direction of twist of strands

Direction of twist of wires and strands are same

Wires in two adjacent strands are twisted in opposite direction

Wires are not twisted

4

# A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

3.6 N/mm² compression

3.6 N/mm² tension

7.2 N/mm² compression

7.2 N/mm² tension

4

Major diameter

Minor diameter

Pitch diameter

Core diameter

4

# The product of the diametral pitch and circular pitch is equal to

1

1/π

π

π × number of teeth

4

# The toughness of a material _________ when it is heated

Does not change

Increases

Decreases

None of the Above

4

# If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

Diameter of bolt

0.75 × diameter of bolt

1.25 × diameter of bolt

1.5 × diameter of bolt

4

Elastic limit to the working stress

Elastic limit to the yield point

Endurance limit to the working stress

Young's modulus to the ultimate tensile strength

4

Tempering

Normalising

Annealing

Spheroidising

4

0.5 times

Equal to

2 times

Double

4

# Idler pulley is used for

Increasing velocity ratio

For applying tension

Changing the direction of motion of belt

All of these

4

2

4

8

16

4

# The cam follower extensively used in aircraft engines is

Knife edge follower

Flat faced follower

Spherical faced follower

Roller follower

4

# The arms of the pulleys for flat belt drive have

Elliptical cross-section

Major axis in plane of rotation

Major axis twice the minor axis

All the three characteristics

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

40°

122°

136°

152°

4

# A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

There are four rivets per pitch length, all in double shear

There are four rivets per pitch length, out of which two are in single shear and two are in double shear

There are five rivets per pitch length, all in double shear

There are five rivets per pitch length, out of which four are in double shear and one is in single shear

4

4

# In designing thick cylinders, the equation used is

Lame's equation

Birnie's equation

Clavarinos' equation

All of these

4

(6V/ π)1/2

(6V/ π)1/3

(6V/ π)2

(6V/ π)3

4

# The shear plane in case of bolts should

Be across threaded portion of shank

Be parallel to axis of bolt

Be normal to threaded portion of shank

Never be across the threaded portion

4

# In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of transverse shear stress and bending stress in the wire

Combined effect of bending stress and curvature of the wire

Combined effect of transverse shear stress and curvature of wire

Combined effect of torsional shear stress and transverse shear stress in the wire

4

# A type of brake commonly used in motor cars is a

Shoe brake

Band and block brake

Band brake

Internal expanding brake

4

# Which one of the following loading is considered for the design of axles?

Bending moment only

Twisting moment only

Combined bending moment and twisting moments

Combined action of bending moment, twisting moment and axial thrust

4

# The suitable material for belt used in flour mill is

Leather

Rubber

Canvas or cotton duck

Balata gum

4

# 18/8 steel contains

18% nickel and 8% chromium

18% chromium and 8% nickel