4

# In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

T₁/T₂ = μθ × n

T₁/T₂ = (μθ)n

T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n

T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n

D. T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n

4

d.t.τu

πd.t.τu

π/4 × d².τu

π/4 × d² × t.τu

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

30°

45°

60°

80°

4

# The bending stress in a curved beam is

Zero at the centroidal axis

Zero at the point other than centroidal axis

Maximum at the neutral axis

None of these

4

# When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Angular bevel gears

Mitre gears

Internal bevel gears

Crown bevel gears

4

# A feather key is generally

Loose in shaft and tight in hub

Tight in shaft and loose in hub

Tight in both shaft and hub

Loose in both shaft and hub

4

Rectangular

Elliptical

I-section

Any one of these

4

# The dedendum circle diameter is equal to (where φ = Pressure angle)

Pitch circle diameter × cosφ

Clearance circle diameter × cosφ

Pitch circle diameter × sinφ

4

# Set 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 parts

Similar to stud

4

# A screw is said to be over hauling screw, if its efficiency is

More than 50 %

Less than 50 %

Equal to 50 %

None of these

4

Ductile materials

Brittle materials

Equally serious in both cases

Depends on other factors

4

4

# The function of a washer is to

Provide cushioning effect

Provide bearing area

Absorb shocks and vibrations

Provide smooth surface in place of rough surface

4

# A bolt of uniform strength can be developed by

Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

Keeping the core diameter smaller than the diameter of the unthreaded portion

Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

None of the above

4

(WD/ πd3) × K

(2WD/ πd3) × K

(4WD/ πd3) × K

(8WD/ πd3) × K

4

0.33

0.4

0.5

0.55

4

Hot piercing

Extrusion

Cold peening

4

# Which of the following statement is correct for gears?

The pitch circle diameter is equal to the product of module and number of teeth

The addendum is less than dedendum

The pitch circle is always greater than the base circle

All of the above

4

# A leaf spring in automobiles is used

To apply forces

To measure forces

To absorb shocks

To store strain energy

4

# For high speed engines, the cam follower should move with

Uniform velocity

Simple harmonic motion

Uniform acceleration and retardation

Cycloidal motion

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

Tension

Shear

Compression

All of the above

4

# A bolt of M 24 × 2 means that

The pitch of the thread is 24 mm and depth is 2 mm

Cross-sectional area of the threads is 24 mm²

The nominal diameter of bolt is 24 mm and pitch is 2 mm

The effective diameter of bolt is 24 mm and there are 2 threads per cm

4

# In case of V-belt drive

The belt should touch the bottom of groove in the pulley

The belt should not touch the bottom of groove in the pulley

The belt should not touch the sides of groove in the pulley

None of the above

4

4

6

8

10

4

Normal pitch

Axial pitch

Diametral pitch

Module

4

# Surface endurance limit of gear material is dependent upon its

Elastic strength

Yield strength

Brinell hardness number

Toughness

4

# The strap end of a connecting rod of steam engine is joined by

Gib of cotter joint

Sleeve and cotter joint

Spigot socket cotter joint

Knuckle joint

4

# A self locking screw has

Coefficient of friction is greater than tangent of load angle

Hole for inserting split pin