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4

Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.

A. Working

B. Bearing

C. Yield

D. None of these

Correct Answer :

A. Working


Related Questions

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In an eutectic system, two elements are completely

A. Soluble in solid state

B. Insoluble in liquid state

C. Insoluble in both solid & liquid state

D. Soluble in liquid state

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4

Property responsible for the talcum powder to cling to the skin is the

A. Capillary action

B. Adhesion

C. Cohesion

D. Surface tension

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4

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A. More

B. Equal

C. Less

D. Double

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4

Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.

A. 723

B. 959

C. 1147

D. 1493

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4

Lead is added to 60:40 brass primarily to improve

A. Machinability

B. Corrosion resistance

C. Fluidity

D. Strength

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4

The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their

A. Equivalent weight

B. (Equivalent weight)2

C. Molecular weight

D. (Molecular weight)2

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4

Steel balls are manufactured by

A. Sintering

B. Casting

C. Cold heading

D. Spinning

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4

The approximate height of a blast furnace having a useful volume of 2000 m3 is about __________ metres

A. 25

B. 35

C. 55

D. 75

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4

In a good rimming steel

A. Carbon and silicon should be low

B. Silicon should be low but carbon should be high

C. Both silicon & carbon should be high

D. Silicon should be high but carbon should be low

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4

__________ has a negative co-efficient of linear expansion.

A. Iron

B. Copper

C. Rubber

D. Nickel

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4

Hot extrusion of aluminium is done in the temperature range of __________ °C.

A. 550-600

B. 450-500

C. 350-400

D. 250-300

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4

The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

A. Creep

B. Endurance

C. Fatigue

D. None of these

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4

The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong

A. Base and strong acid

B. Base and weak acid

C. Acid and weak base

D. None of these

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4

Ultimate strength in tension as compared to that in shear for steel is

A. Half

B. One third

C. One and half times

D. One fourth

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A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its

A. Aqueous tension

B. Saturated humidity

C. Vapor pressure

D. Absolute humidity

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4

Which of the following is not a charge material for cupola?

A. Limestone

B. Iron scrap

C. Iron ore

D. Pig iron

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The most important requirement for aluminium industry is the availability of cheap

A. Ore

B. Electrical power

C. Labour

D. Abundant water

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4

The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the

A. Ability to absorb shock

B. Capacity to store energy

C. Ratio of the wire & coil diameters

D. Load to produce unit deflection

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4

The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.

A. 140

B. 180

C. 240

D. 280

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4

The best lubricants for a machine working at high temperature & load is

A. Grease

B. Solid lubricant

C. Animal oils

D. Mineral oils

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4

Between 230 and 370°C, blue brittleness is caused in mild steel because of the

A. Immobility of dislocation

B. Strain-ageing

C. Increase in Young's modulus

D. Strain hardening

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4

Which of the following equipments is used for liquid dispersion?

A. Packed column

B. Venturi scrubber

C. Bubble cap plate column

D. Wetted wall column

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4

The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)

A. A

B. D

C. 1/A

D. 1/A2

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4

Particle nature of cathode rays is proved due to the fact that they

A. Travel in a straight line

B. Get deflected by magnetic electric field

C. Produce fluorescence

D. Heat the exposed material

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4

The most suitable material for die casting is

A. Iron

B. Copper

C. Steel

D. Nickel

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4

Cemented carbide tools are not suitable for cutting

A. Aluminium

B. Brass

C. Cast iron

D. Steel

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4

Which of the following is the largest quantum of pressure?

A. 1 kg/cm2

B. 1 bar

C. 1 atmosphere

D. 1 kilo Pascal

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4

The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.

A. 768

B. 1127

C. 1359

D. 1480

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4

Saturated steam at a pressure of 25 kg/cm2 is throttled to attain 5 kg/cm2. Then the outcoming steam will be

A. Wet

B. Saturated

C. Superheated

D. None of these

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4

The most commonly used moderator in nuclear power plants is

A. Graphite

B. Light water

C. Heavy water

D. Beryllium