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4

When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

A. Axially upwards

B. Axially downwards

C. Axially upwards or downwards

D. None of these

Correct Answer :

C. Axially upwards or downwards


Related Questions

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4

The rolling contact bearings as compared to sliding contact bearings have

A. Low starting and low running friction except at very high speeds

B. Accuracy of shaft alignment

C. Small overall dimensions

D. All of the above

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4

Cast iron pipes are mainly used

A. For conveying steam

B. In water and sewage systems

C. In pressure lubrication systems on prime movers

D. All of the above

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4

In order to obtain bolt of uniform strength

A. Increase shank diameter

B. Increase its length

C. Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

D. Tighten die bolt properly

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4

In most machine members, the damping capacity of the material should be

A. Low

B. Zero

C. High

D. Could be anything

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4

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

A. Both ends hinged

B. Both ends fixed

C. One end fixed and the other end hinged

D. One end fixed and the other end free

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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

Which is positive drive?

A. Flat belt drive

B. V-belt drive

C. Crossed belt drive

D. Timing belt

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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

Buttress threads are usually found on

A. Screw cutting lathes

B. Feed mechanisms

C. Spindles of bench vices

D. Railway carriage couplings

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4

The included angle for the British Association thread is

A. 29°

B. 55°

C. 47.3°

D. 60°

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4

Which of the following spring is used in mechanical wrist watch?

A. Helical compression spring

B. Spiral spring

C. Torsion spring

D. Belleville spring

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4

A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

A. 3.6 N/mm² compression

B. 3.6 N/mm² tension

C. 7.2 N/mm² compression

D. 7.2 N/mm² tension

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4

When two springs are in series (having stiffness K), the equivalent stiffness will be

A. K

B. K/2

C. 2K

D. K/4

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4

Pick up wrong statement. Fatigue strength can be increased by

A. Cold working

B. Shot peening

C. Grinding and lapping surface

D. Hot working

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4

The following type of nut is used with alien bolt

A. Hexagonal nut

B. Slotted nut

C. Castle nut

D. Any one of the above

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4

The maximum shear stress theory is used for

A. Brittle materials

B. Ductile materials

C. Plastic materials

D. Nonferrous materials

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4

The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

A. One-fourth

B. One-third

C. One-half

D. Double

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4

Transverse fillet welded joints are designed for

A. Tensile strength

B. Compressive strength

C. Shear strength

D. Bending strength

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4

The lower deviation is the algebraic difference between the

A. Actual size and the corresponding basic size

B. Maximum limit and the basic size

C. Minimum limit and the basic size

D. None of the above

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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

When two nonintersecting and non-coplanar shafts are connected by gears, the arrangement is known as

A. Spur gearing

B. Helical gearing

C. Bevel gearing

D. Spiral gearing

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4

The backlash for spur gears depends upon

A. Module

B. Tooth profile

C. Both module and pitch line velocity

D. Pitch line velocity

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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

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

A. Torque in each shaft is the same

B. Shear stress in each shaft is the same

C. Angle of twist of each shaft is the same

D. Torsional stiffness of each shaft is the same

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4

The power transmitted by the belt drive can be increased by

A. Increasing the initial tension in the belt

B. Dressing the belt to increase the coefficient of friction

C. Increasing wrap angle by using idler pulley

D. All of the above methods

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4

The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

A. 1420 d

B. 1680 d

C. 2080 d

D. 2840 d

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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

In a flange coupling, the bolts are subjected to

A. Tensile stress

B. Compressive stress

C. Shear stress

D. None of these

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4

The bearings of medium series have capacity __________ over the light series.

A. 10 to 20 %

B. 20 to 30 %

C. 30 to 40 %

D. 40 to 50 %

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4

If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

A. 124 d

B. 138 d

C. 151 d

D. 168 d