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4

If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

A. T₁ - T₂ + Tc

B. T₁ + T₂ + Tc

C. (T₁ - T₂ + Tc)/2

D. (T₁ + T₂ + Tc)/2

Correct Answer :

D. (T₁ + T₂ + Tc)/2


Related Questions

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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

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

Lewis form factor for 14 ½° composite and full depth involute system is (where T = Number of teeth)

A. 0.124 - (0.684/T)

B. 0.154 - (0.912/T)

C. 0.175 - (0.841/T)

D. None of these

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4

In block brakes, the ratio of shoe width to wheel diameter is taken between

A. 0.1 and 0.25

B. 0.25 and 0.50

C. 0.50 and 0.75

D. 0.75 and 1

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4

In a hydrodynamic lubricated bearing

A. There is a thick film of lubricant between the journal and the bearing

B. There is a thin film of lubricant between the journal and the bearing

C. The lubricant is forced between the journal and the bearing, by external pressure

D. There is no lubricant between the journal and the bearing

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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

The belt slip occurs due to

A. Heavy load

B. Loose belt

C. Driving pulley too small

D. Any one of the above

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4

The stress induced in the belt is,

A. Tensile stress

B. Compressive stress

C. Direct shear stress

D. Torsional shear stress

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4

While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

A. Both the ends fixed

B. Both the ends hinged

C. One end fixed and the other end hinged

D. One end fixed and the other end free

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4

The modulus of elasticity for mild steel is approximately equal to

A. 80 kN/mm²

B. 100 kN/mm²

C. 110 kN/mm²

D. 210 kN/mm²

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4

The radial distance of a tooth from the pitch circle to the top of the tooth is called

A. Addendum

B. Dedendum

C. Clearance

D. Working depth

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4

For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

A. 0.4 times

B. 0.6 times

C. 0.7 times

D. 0.8 times

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4

The gears are termed as medium velocity gears, if their peripheral velocity is

A. 1-3 m/s

B. 3-15 m/s

C. 15-30 m/s

D. 30-50 m/s

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4

Multiple threads are used to secure

A. Low efficiency

B. High efficiency

C. High load lifting capacity

D. High mechanical advantage

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4

A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

A. 5 mm

B. 10 mm

C. 15 mm

D. 25 mm

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4

In skew bevel gearing, the axes of shafts are

A. Intersecting and the teeth are curved

B. Non-intersecting and nonparallel and the teeth are curved

C. Non-intersecting and non-parallel and the teeth are straight

D. None of the above

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4

In a butt welded joint, the size of weld is __________ the throat of weld.

A. 0.5 times

B. Equal to

C. 2 times

D. Double

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4

Which process will increase the fatigue duration of parts?

A. Finishing and polishing

B. Shotpeening

C. De-carburisation

D. Electroplating

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4

According to Rankine's theory, the failure occurs at a point in a member

A. When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test

B. When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test

C. When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test

D. When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

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4

In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

A. Increase the key length

B. Increase the key depth

C. Increase the key width

D. Decrease the key length

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4

The spring mostly used in gramophones is

A. Helical spring

B. Conical spring

C. Flat spiral spring

D. Volute spring

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4

A type of brake commonly used in motor cars is a

A. Shoe brake

B. Band and block brake

C. Band brake

D. Internal expanding brake

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4

A screw is said to be over hauling screw, if the

A. Friction angle is less than helix angle

B. Friction angle is more than helix angle

C. Friction angle is equal to helix angle

D. Efficiency of screw is 100%

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4

Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

A. 2

B. 4

C. 8

D. 16

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4

The strength of a riveted joint is equal to

A. Tearing strength of plate (Pt)

B. Shearing strength of rivet (Ps)

C. Crushing strength of rivet (Pc)

D. Least value of Pt Ps and Pc

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4

Which one of the following loading is considered for the design of axles?

A. Bending moment only

B. Twisting moment only

C. Combined bending moment and twisting moments

D. Combined action of bending moment, twisting moment and axial thrust

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4

Crushing resistance required to crush the rivet per pitch length is

A. p.d.σc

B. p.t.σc

C. n.d.t.σc

D. (p - d) t.σc

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4

The suitable material for belt in agricultural machinery is

A. Leather

B. Rubber

C. Cotton duck

D. Balata gum

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4

An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called

A. Addendum circle

B. Dedendum circle

C. Pitch circle

D. Clearance circle

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4

The stretching in a belt can be controlled by __________ the stress in the belt.

A. Reducing

B. Increasing

C. Both A and B

D. None of these