4

# The designation M 33 × 2 of a bolt means

Metric threads of 33 numbers in 2 cm

Metric threads with cross-section of 33 mm

Metric threads of 33 mm outside diameter and 2 mm pitch

Bolt of 33 mm nominal diameter having 2 threads per cm

C. Metric threads of 33 mm outside diameter and 2 mm pitch

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

# The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Normalising

Full annealing

Process annealing

Spheroidising

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

d/2

d/3

3d/4

d/4

4

d = t

d = 1.6 t

d = 2t

d = 6t

4

(6V/ π)1/2

(6V/ π)1/3

(6V/ π)2

(6V/ π)3

4

Measure forces

Apply forces

Store energy

All of these

4

Butt weld

Fillet weld

Sleeve weld

Socket weld

4

90

60

120

100

4

Woodruff key

Feather key

4

4

Above

Below

At

None of these

4

# Stress concentration is caused due to

Variation in properties of material from point to point in a member

Pitting at points or areas at which loads on a member are applied

Abrupt change of section

All of the above

4

# The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the polar moment of inertia and to the distance of the point from the axis

Directly proportional to the applied torque and inversely proportional to the polar moment of inertia

Directly proportional to the applied torque and the polar moment of inertia

Inversely proportional to the applied torque and the polar moment of inertia

4

# Rivets are generally specified by

Thickness of plates to be riveted

Length of rivet

Nominal diameter

4

# The taper on cotter varies from

1 in 24 to 1 in 20

1 in 15 to 1 in 10

1 in 32 to 1 in 24

1 in 48 to 1 in 24

4

8

12

18

20

4

# The backlash for spur gears depends upon

Module

Tooth profile

Both module and pitch line velocity

Pitch line velocity

4

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

Cold working

Shot peening

Grinding and lapping surface

Hot working

4

8

6

4

2

4

# Belt slip may occur due to

Loose belt

Driving pulley too small

All of the above

4

0.2

0.25

0.50

0.6

4

Woodruff key

Feather key

Tangent key

4

Plasticity

Elasticity

Ductility

Malleability

4

4

6

8

10

4

# For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

2μ sinθ/(θ + sinθ)

μ sinθ/(2θ + sin 2θ)

4μ sinθ/(θ + sinθ)

4μ sinθ/(2θ + sin 2θ)

4

White metal

Silicon bronze

Monel metal

Phosphor bronze

4

Bearing failure

Shearing failure

Bending failure

All of these

4

# The velocity factor for precision metallic gears cut with high accuracy and operating at velocities upto 20 m/s is equal to

0.75/ (0.75 + √v)

3/ (3 + v)

4.5/ (4.5 + v)

6/ (6 + v)

4

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

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

Draw into wires by the application of a tensile force

Resist fracture due to high impact loads

Retain deformation produced under load permanently