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What is the correct answer?

4

Jam nut is a locking device in which

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. A slot is cut partly in middle of nut and then slot reduced by tightening a screw

C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

Correct Answer :

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming


Related Questions

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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

Split nut is a locking device in which

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. A slot is cut partly in middle of nut and then slot reduced by tightening screw

C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

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4

Creep in belt is due to

A. Material of the belt

B. Material of the pulley

C. Uneven extensions and contractions due to varying tension

D. All of the above

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4

A bolt

A. Has a head on one end and a nut fitted to the other

B. Has head at one end and other end fits into a tapped hole in the other part to be joined

C. Has both the ends threaded

D. Is provided with pointed threads

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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

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

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

Brittle coating technique is used for

A. Determining brittleness

B. Protecting metal against corrosion

C. Protecting metal against wear and tear

D. Experimental stress analysis

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4

The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

A. Repeated stress

B. Yield stress

C. Fluctuating stress

D. Alternating stress

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4

When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

A. 4F/ πd²

B. 6F/ πd²

C. 8F/ πd²

D. 16F/ 3πd²

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4

An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the

A. Tip of the pinion and flank of gear

B. Tip of the gear and flank of pinion

C. Flanks of both gear and pinion

D. Tip of both gear and pinion

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4

The toughness of a material _________ when it is heated

A. Does not change

B. Increases

C. Decreases

D. None of the Above

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4

In a marine flange coupling, the pitch circle diameter of bolts is taken as

A. 1.2 d

B. 1.6 d

C. 2d

D. 2.5 d

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4

The shear stress at a point in a shaft subjected to a torque is

A. Directly proportional to the polar moment of inertia and to the distance of the point from the axis

B. Directly proportional to the applied torque and inversely proportional to the polar moment of inertia

C. Directly proportional to the applied torque and the polar moment of inertia

D. Inversely proportional to the applied torque and the polar moment of inertia

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4

Which of the following statement is wrong for a connecting rod?

A. The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy

B. If Ixx > 4 Iyy, the buckling will occur about Y-axis

C. If Ixx < 4 Iyy, the buckling will occur about X-axis

D. The most suitable section for the connecting rod is T-section

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4

The maximum bending stress in a curved beam having symmetrical section always occur at the

A. Centroidal axis

B. Neutral axis

C. Inside fibre

D. Outside fibre

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4

The material commonly used for crane hooks is

A. Cast iron

B. Wrought iron

C. Mild steel

D. Aluminium

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4

In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

A. d

B. 1.25 d

C. 1.5 d

D. 1.75 d

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4

Basic hole is one

A. Whose upper deviation is zero

B. Whose lower deviation is zero

C. Whose lower as well as upper deviations are zero

D. Does not exist

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4

Spring index is

A. Ratio of coil diameter to wire diameter

B. Load required to produce unit deflection

C. Its capability of storing energy

D. Indication of quality of spring

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4

The smallest diameter of an external or internal screw thread is known as

A. Minor diameter

B. Major diameter

C. Pitch diameter

D. None of these

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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

Fabric belts are used in industrial applications because

A. They are cheap

B. They can work at high temperature

C. They are unaffected by moisture and humidity

D. None of the above

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4

The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

A. εc + 2εl

B. c + εl

C. εc + εl²

D. εc² + εl

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4

The groove angle of pulleys for V-belt is

A. 340 to 360

B. 420 to 450

C. More than 400

D. 300 to 320

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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

Applications in which stresses are encountered in one direction only uses following type of threads

A. Metric

B. Buttress

C. Acme

D. Square

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4

According to Indian standard specifications, 100 H6/g5 means that

A. Tolerance grade for the hole is 6 and for the shaft is 5

B. Tolerance grade for the shaft is 6 and for the hole is 5

C. Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7

D. Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7

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4

Taper on the cotter and slot is provided

A. On both the sides

B. On one side only

C. On none of the sides

D. May be provided anywhere

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4

According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

A. (π/4) d² × τ × n

B. 1.875 × (π/4) d² × τ × n

C. 2 × (π/4) d² × τ × n

D. 3 × (π/4) d² × τ × n