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The most suitable material for die casting is

A. Iron

B. Copper

C. Steel

D. Nickel

Correct Answer :

B. Copper


Related Questions

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Constituents of stellite are

A. Zinc, copper & nickel

B. Cobalt, chromium & tungsten

C. Zinc, aluminium & nickel

D. Nickel, cobalt & vanadium

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4

Water hammer is caused in steam carrying pipelines, because of

A. Partial condensation of steam

B. Vibration of the pipeline

C. High degree of superheat of steam

D. Its exposure to torrential rain

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Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to

A. Achieve very high purity of aluminium (99.9%)

B. Keep the electrolyte in liquid condition by the generation of heat

C. Electrolytically dissociate alumina

D. Both (B) & (C)

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4

The condition of diffraction from a crystal is given by

A. nλ = 2d Sin θ

B. λ = d Sin 2θ

C. λ = 2d Sin 2θ

D. nλ = d Sin θ

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The specific gravity of coal depends mainly on its __________ content.

A. Carbon

B. Volatile matter

C. Ash

D. Moisture

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Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.

A. 70 & 30

B. 30 & 70

C. 50 & 50

D. 90 & 10

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About __________ ton of coke is required in a cupola to produce one ton of casting.

A. 0.03

B. 0.3

C. 0.8

D. 1.5

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4

When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

A. Decreases & increases

B. Increases & increases

C. Increases & decreases

D. Decreases & decreases

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__________ is used for tying the steel columns to concrete foundation.

A. Grouting

B. Eyebolt

C. Anchor bolts

D. Refractory castables

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4

Good design of the casing of a centrifugal pump aims at minimising the

A. Cavitation

B. Frictional losses

C. Kinetic energy loss

D. Static head

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4

Which of the following is a boiler accessory
i.e., not a boiler mounting?

A. Blow off cock

B. Feed check valve

C. Feed water pump

D. Stop valve

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4

X-rays are

A. Positively charged

B. Negatively charged

C. Neutral

D. Of higher wavelength than visible light

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Non-ferrous alloys used for making cutting tools need not have high

A. Abrasion resistance

B. Toughness

C. Red hardness

D. Cutting speed

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Euler number is defined as the ratio of inertia force to __________ force.

A. Pressure

B. Elastic

C. Gravity

D. Viscous

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__________ are normally subjected to sub-zero treatment.

A. Highly stressed parts

B. Gauges or precision parts

C. Cold rolled sheets

D. Non machinable materials

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Liquid nitrogen containers can be made from

A. Ferritic stainless steel

B. HSLA steel

C. Titanium

D. Austenitic stainless steel

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An alloy of Fe - 0.4 % C is

A. Cast iron

B. Hypo-eutectoid steel

C. Hyper-eutectoid steel

D. Eutectoid steel

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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

Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same

A. Period increases

B. Period decreases

C. Group increases

D. Both 'b' & 'c'

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Stellite is a __________ material.

A. Ferrous

B. Ceramic

C. Cemented carbide

D. Non-ferrous cast alloy cutting tool

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4

Which of the following material handling equipments is not suitable for moving materials in varying paths?

A. Hand trolley

B. Belt conveyor

C. Crane

D. Truck

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4

Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.

A. Flanged iron

B. Collar

C. Flexible

D. Expansion

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Milk is fat dispersed in water. It is an example of

A. Suspension

B. Emulsion

C. Gel

D. Solution

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Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas)

A. √T

B. 1/√P

C. √y

D. 1/√ρ

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4

The burnout heat flux in the nucleate boiling regime is not a function of the

A. Liquid density

B. Vapour density

C. Temperature difference

D. Heat of evaporation

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4

Which of the following rays has the least wavelength?

A. Ultraviolet rays

B. Infrared rays

C. Cosmic rays

D. X-rays

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The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.

A. 0

B. 100

C. 50

D. None of these

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While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the

A. Low impact strength

B. High flexibility

C. Better finish and surface appearance

D. High plastic deformation

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Which of the following metals cannot be hot worked at room temperature?

A. Zinc

B. Nickel

C. Lead

D. Tin

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Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

A. Manganese

B. Phosphorous

C. Magnesium

D. Chromium