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Current Affairs January 2024

What is the correct answer?

4

The product of the diametral pitch and circular pitch is equal to

A. 1

B. 1/π

C. π

D. π × number of teeth

Correct Answer :

C. π


Related Questions

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4

The design of the pressure vessel is based on

A. Longitudinal stress

B. Hoop stress

C. Longitudinal and hoop stress

D. None of these

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4

In case of pressure vessels having closed ends, the fluid pressure induces

A. Longitudinal stress

B. Shear stress

C. Circumferential stress

D. None of these

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4

Basic shaft 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

A transmission shaft includes

A. Over head shaft

B. Counter shaft

C. Line shaft

D. All of these

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4

In composite or reverse laid ropes

A. Direction of twist of wires in strands is opposite to the direction of twist of strands

B. Direction of twist of wires and strands are same

C. Wires in two adjacent strands are twisted in opposite direction

D. Wires are not twisted

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4

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

A. Thread

B. Middle

C. Shank

D. Head

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4

The largest 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 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

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4

During hot working of metals,

A. Porosity of the metal is largely eliminated

B. Grain structure of the metal is refined

C. Mechanical properties are improved due of refinement of grains

D. All of the above

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4

A spring is used to

A. Measure forces

B. Apply forces

C. Store energy

D. All of these

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4

Which is correct statement? Stress concentration in static loading is

A. Very serious in brittle materials and less serious in ductile materials

B. Very serious in ductile materials and less serious in brittle materials

C. Equally serious in both types of materials

D. Seriousness would depend on other factors

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4

The velocity of sliding ________ the distance of the point of contact from the pitch point.

A. Is directly proportional to

B. Is inversely proportional to

C. Is equal to cos φ multiplied by

D. Does not depend upon

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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

A connecting rod should be

A. Strong in buckling about X-axis

B. Strong in buckling about Y-axis

C. Equally strong in buckling about X-axis and Y-axis

D. Any one of the above

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4

If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

A. Maximum principal stress theory

B. Maximum shear stress theory

C. Maximum strain energy theory

D. Maximum distortion energy theory

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4

In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

A. Remains constant at all speeds

B. Is minimum at zero speed and increases monotonically with increase in speed

C. Is maximum at zero speed and decreases monotonically with increase in speed

D. Becomes minimum at an optimum speed and then increases with further increase in speed

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4

Which is correct statement? Stress concentration in cyclic loading is

A. Very serious in brittle materials and less serious in ductile materials

B. Very serious in ductile materials and less serious in brittle materials

C. Equally serious in both types of materials

D. Seriousness would depend on other factors

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4

Oil in journal bearing should be applied at the point where load is

A. Nil or lightest

B. Maximum

C. Average

D. Any one of the above

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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

Which of the following screw thread is adopted for power transmission in either direction?

A. Acme threads

B. Square threads

C. Buttress threads

D. Multiple threads

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4

In worm, gears, pitch lead angle is

A. Half the angle between two inclined faces in axial plane

B. The angle between the tangent to the pitch helix and the plane of rotation

C. The angle between the tangent to the pitch helix and an element of the cylinder

D. None of the above

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4

For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

A. 2μ sinθ/(θ + sinθ)

B. μ sinθ/(2θ + sin 2θ)

C. 4μ sinθ/(θ + sinθ)

D. 4μ sinθ/(2θ + sin 2θ)

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4

The value of Lewis form factor used in design of gears is

A. Dependent on number of teeth of a gear

B. Dependent on system of teeth

C. Independent of size of teeth

D. All of these

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4

The number of slots in a 25 mm castle nut is

A. 8

B. 4

C. 2

D. 6

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4

The piston pin bearings in heavy duty diesel engines are

A. Needle roller bearings

B. Tapered roller bearings

C. Spherical roller bearings

D. Cylindrical roller bearings

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4

Two helical springs of the same material and of equal circular crosssection, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

A. W/2

B. 2W/3

C. W/9

D. 8W/9

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4

In designing a connecting rod, it is considered like __________ for buckling about X-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 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

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 effective stress in wire ropes during normal working is equal to the stress due to

A. Axial load plus stress due to bending

B. Acceleration/retardation of masses plus stress due to bending

C. Axial load plus stress due to acceleration/retardation

D. Bending plus stress due to acceleration/retardation