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4

According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

A. M6

B. M8

C. M6 - 8d

D. M8 - 6d

Correct Answer :

C. M6 - 8d


Related Questions

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Maximum principal stress theory is applicable for

A. Ductile materials

B. Brittle materials

C. Elastic materials

D. All of the above

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4

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

A. Knuckle joint

B. Cotter joint

C. Oldham coupling

D. Universal joint

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4

The rated life of a bearing varies

A. Directly as load

B. Inversely as square of load

C. Inversely as cube of load

D. Inversely as fourth power of load

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4

The shock absorbing capacity of a bolt can be increased by

A. Tightening it properly

B. Increasing shank diameter

C. Grinding the shank

D. Making shank diameter equal to core diameter of thread.

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4

The draw of cotter should not be more than

A. 3 mm

B. 6 mm

C. 8 mm

D. 12 mm

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4

The efficiency of a riveted joint is equal to

A. Pt /P

B. Ps /P

C. Pc /P

D. Least of Pt, Ps and Pc/P

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4

The cold working of metals is carried out __________ the recrystallisation temperature.

A. Above

B. Below

C. At

D. None of these

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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

Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

A. Twice

B. Four times

C. Eight times

D. Sixteen times

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4

Gear box is used

A. To produce torque

B. For speed reduction

C. To obtain variable speeds

D. To increase efficiency of system

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4

The shock resistance of steel is increased by adding

A. Nickel

B. Chromium

C. Nickel and chromium

D. Cobalt and molybdenum

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4

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

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

B. Draw into wires by the application of a tensile force

C. Resist fracture due to high impact loads

D. Retain deformation produced under load permanently

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4

The load cup of a screw jack is made separate from the head of the spindle to

A. Prevent the rotation of load being lifted

B. Enhance the load carrying capacity of the jack

C. Reduce the effort needed for lifting the working load

D. Reduce the value of frictional torque

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4

When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

A. Knuckle threads

B. Square threads

C. Acme threads

D. Buttress threads

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4

According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

A. Equating tearing resistance of the plate to the shearing resistance of the rivets

B. Equating tearing resistance of the plate to the crushing resistance of the rivets

C. Equating shearing resistance to the crushing resistance of the rivets

D. None of the above

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4

When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

A. Same

B. Double

C. One-half

D. One-fourth

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4

A localised compressive stress at the area of contact between two members is known as

A. Tensile stress

B. Bending stress

C. Bearing stress

D. Shear stress

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4

If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

A. 0.2

B. 0.25

C. 0.50

D. 0.6

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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 helix angle for single helical gears ranges from

A. 10° to 15°

B. 15° to 20°

C. 20° to 35°

D. 35° to 50°

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4

If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

A. T sec3φ

B. T sec²φ

C. T/sec3φ

D. T cosecφ

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4

The arms of the pulleys for flat belt drive have

A. Elliptical cross-section

B. Major axis in plane of rotation

C. Major axis twice the minor axis

D. All the three characteristics

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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

A. (k₁ k₂)/ (k₁ + k₂)

B. (k₁ - k₂)/ (k₁ + k₂)

C. (k₁ + k₂)/ (k₁ k₂)

D. (k₁ - k₂)/ (k₁ k₂)

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4

The angle of twist of shaft is

A. Directly proportional to (shaft diameter)²

B. Inversely proportional to (shaft diameter)²

C. Directly proportional to (shaft diameter)⁴

D. Inversely proportional to (shaft diameter)⁴

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4

A localised compressive stress at the area of contact between two members is known as

A. Bending stress

B. Shear stress

C. Tensile stress

D. Bearing stress

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4

Which of the following statement is correct?

A. A parallel sunk key is a taperless key

B. A parallel sunk key may be rectangular or square in cross-section

C. A flat saddle key is a taper key which fits in a key way of the hub and is flat on the shaft

D. All of the above

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4

In a journal bearing, the load on the bearing is __________ to the axis of the journal.

A. Parallel

B. Perpendicular

C. Both A and B

D. None of these

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4

Which is correct statement?

A. A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

B. A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

C. Both will be equally rigid

D. Which one is rigid will depend on several other factors

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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

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4

The face of the tooth is the

A. Surface of the top of the tooth

B. Surface of the tooth above the pitch surface

C. Surface of the tooth below the pitch surface

D. Width of the tooth measured along the pitch circle