4

In levers, leverage is the ratio of

Load lifted to the effort applied

Mechanical advantage to the velocity ratio

Load arm to the effort arm

Effort arm to the load arm

D. Effort arm to the load arm

4

Rankine Gordon formula for buckling is valid for

Long column

Short column

Short and long column

Very long column

4

Woodruff key

Feather key

4

In designing a connecting rod, it is considered like __________ for buckling about X-axis.

Both ends hinged

Both ends fixed

One end fixed and the other end hinged

One end fixed and the other end free

4

1/sinθ

1/cosθ

1/tanθ

sinθ cosθ

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

The connecting rod bolts are tightened up with initial tension greater than the external load so that

Joint may not open up

Bolts are weakest elements

The resultant load on the bolt would not be affected by the external cyclic load

Bolts will not loosen during service

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

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

The distribution of the forces along the length of key fitted in a shaft

Varies linearly

Is uniform throughout

Varies exponentially, being more near the torque-input end

Varies exponentially, being less near the torque-input end

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

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

Rectangular

Elliptical

I-section

Any one of these

4

In hydrostatic bearings

The Oil film pressure is generated only by the rotation of the journal

The oil film is maintained by supplying oil under pressure

Do not require external supply of lubricant

Grease is used for lubrication

4

340 to 360

420 to 450

More than 400

300 to 320

4

30°

45°

60°

80°

4

Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ k₂)/ (k₁ + k₂)

(k₁ - k₂)/ (k₁ + k₂)

(k₁ + k₂)/ (k₁ k₂)

(k₁ - k₂)/ (k₁ k₂)

4

The value of stress concentration factor depends upon

Material and geometry of the part

Geometry of the part

Material of the part

None of these

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

The belt slip occurs due to

Loose belt

Driving pulley too small

Any one of the above

4

Which of the following statement is correct, for two shafts connected in parallel?

Torque in each shaft is the same

Shear stress in each shaft is the same

Angle of twist of each shaft is the same

Torsional stiffness of each shaft is the same

4

0.33

0.4

0.5

0.55

4

In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Remains constant at all speeds

Is minimum at zero speed and increases monotonically with increase in speed

Is maximum at zero speed and decreases monotonically with increase in speed

Becomes minimum at an optimum speed and then increases with further increase in speed

4

The rolling contact bearings as compared to sliding contact bearings have

Low starting and low running friction except at very high speeds

Accuracy of shaft alignment

Small overall dimensions

All of the above

4

Dun cylinder

Hollow shaft

Solid shaft

Thick cylinder

4

1

2

3

4

4

Parallel

Perpendicular

Both A and B

None of these

4

Compression

Tension

Shear

4

0.5 to 1

1 to 2

3 to 5

5 to 10

4

40°

45°

38°

60°