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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)

A. T₁/T₂ = μθ × n

B. T₁/T₂ = (μθ)n

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

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

Correct Answer :

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


Related Questions

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4

When a hole of diameter d is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

A. d.t.τu

B. πd.t.τu

C. π/4 × d².τu

D. π/4 × d² × t.τu

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4

The expression 0.175 - 0.841/T is the Lewis form factor for

A. 14 ½° composite and full depth involute system

B. 20° full depth involute system

C. 20° stub system

D. None of the above

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4

The edges of a boiler plate are bevelled to an angle of

A. 30°

B. 45°

C. 60°

D. 80°

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4

The bending stress in a curved beam is

A. Zero at the centroidal axis

B. Zero at the point other than centroidal axis

C. Maximum at the neutral axis

D. None of these

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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

A. Angular bevel gears

B. Mitre gears

C. Internal bevel gears

D. Crown bevel gears

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4

A feather key is generally

A. Loose in shaft and tight in hub

B. Tight in shaft and loose in hub

C. Tight in both shaft and hub

D. Loose in both shaft and hub

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4

The cross-section of the arm of a bell crank lever is

A. Rectangular

B. Elliptical

C. I-section

D. Any one of these

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4

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

A. Pitch circle diameter × cosφ

B. Addendum circle diameter × cosφ

C. Clearance circle diameter × cosφ

D. Pitch circle diameter × sinφ

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4

Set screws are

A. Similar to small size tap bolts except that a greater variety of shapes of heads are available

B. Slotted for a screw driver and generally used with a nut

C. Used to prevent relative motion between parts

D. Similar to stud

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4

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

A. More than 50 %

B. Less than 50 %

C. Equal to 50 %

D. None of these

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4

Stress concentration in cyclic loading is more serious in

A. Ductile materials

B. Brittle materials

C. Equally serious in both cases

D. Depends on other factors

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4

In testing a material for endurance strength, it is subjected to

A. Static load

B. Dynamic load

C. Impact load

D. Completely reversed load

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4

The function of a washer is to

A. Provide cushioning effect

B. Provide bearing area

C. Absorb shocks and vibrations

D. Provide smooth surface in place of rough surface

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4

A bolt of uniform strength can be developed by

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

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

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

D. None of the above

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4

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

A. (WD/ πd3) × K

B. (2WD/ πd3) × K

C. (4WD/ πd3) × K

D. (8WD/ πd3) × K

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4

The ratio of endurance limit in shear to the endurance limit in flexure is

A. 0.33

B. 0.4

C. 0.5

D. 0.55

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4

The process extensively used for making bolts and nuts is

A. Hot piercing

B. Extrusion

C. Cold peening

D. Cold heading

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4

Which of the following statement is correct for gears?

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

B. The addendum is less than dedendum

C. The pitch circle is always greater than the base circle

D. All of the above

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4

A leaf spring in automobiles is used

A. To apply forces

B. To measure forces

C. To absorb shocks

D. To store strain energy

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4

For high speed engines, the cam follower should move with

A. Uniform velocity

B. Simple harmonic motion

C. Uniform acceleration and retardation

D. Cycloidal motion

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4

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

A. 0.75/ (0.75 + √v)

B. 3/ (3 + v)

C. 4.5/ (4.5 + v)

D. 6/ (6 + v)

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4

When a close coiled helical spring is compressed, its wire is subjected to

A. Tension

B. Shear

C. Compression

D. All of the above

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4

A bolt of M 24 × 2 means that

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

B. Cross-sectional area of the threads is 24 mm²

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

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

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4

In case of V-belt drive

A. The belt should touch the bottom of groove in the pulley

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

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

D. None of the above

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4

For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be

A. 4

B. 6

C. 8

D. 10

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4

In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

A. Normal pitch

B. Axial pitch

C. Diametral pitch

D. Module

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4

Surface endurance limit of gear material is dependent upon its

A. Elastic strength

B. Yield strength

C. Brinell hardness number

D. Toughness

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4

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

A. Gib of cotter joint

B. Sleeve and cotter joint

C. Spigot socket cotter joint

D. Knuckle joint

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4

A self locking screw has

A. Fine threads

B. Course threads

C. Coefficient of friction is greater than tangent of load angle

D. Hole for inserting split pin

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4

The piston rod of a steam engine is usually connected to the crosshead by means of

A. Bolted joint

B. Knuckle joint

C. Cotter joint

D. Universal joint