Question # 1

What is the lowest temperature diffusion hardening process and does not require a quench

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Carburizing

Tempering

Nitriding

Melting

While compacting the concrete by a mechanical vibrator, the slump should not exceed.

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2.5 cm

10 cm

3.1 cm

5.0 cm

______ is used for Annealing

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Klin

Batch

Converter

Oven

Which of the following is raw material not present on the cement.

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Lime stone

Gypsum

Red lead

Blast furnace slag

Which of the following cast irons is a high carbon, iron carbon silicon alloy.

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Deorizers

Deoxidizers

Deoxifiers

Deterrent

Which is major component of Bordeaux mixture.

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Copper sulphate

Sodium chloride

Calcium chloride

Magnesium sulphate

The wear-resistance of the material is attributed to its ability on ________ that is the hardness is increased greatly when the steel is cold worked.

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Cold harden

Stress harden

Strain harden

Cool temperature

Which substances is not used as an additive in paper industry.

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Glucose

Starch

Alum

None of these

Which one of the following set of raw material is most suitable for manufacture of urea.

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CH4N2 and CO2

H2CO2 and H2O

H2O N2 and H2

H2O N2 AND KCl

What is the minimum tensile strength of gray Cast Iron class 50

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25000 ibf /in²

50000 ibf/in²

100000 ibf/in²

900000 ib/in²

LPG is use this

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Vehicles

Aviation Fuel

Home

All above

Which of the following does NOT react with sodium hydroxide solution.

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Fat

Vinegar

Ethanol

Water

The group H steels can be used n what temperature range.

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600^oC to 1100 ^oC

1000 ^oC to 1500 ^oC

1100 ^oC to 2000 ^oC

200 ^oC to 800 ^oC

The percentage of nitrogen in Urea is _____________%

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46

37

82

50

What refers to a shape achieved by allowing a liquid to solidify in a mold.

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Casting

Molding

Forming

All of the choices

Not a Characteristic property of ceramic material

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High temperature stability

High mechanical strength

Low elongation

Low hardness

The juice is allowed to boil at lower temperatures to protect the sugar from

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Hardening

Solubility in water

Caramelization

Dwatering

________is best in its cleaning action.

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Soap

Detergents

Surfactant

None of these

In Pakistan the total production of glass is over ________ tons per year.

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800

8000

80,000

None of these

_________ is used as stablizer.

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CaO

SiO2

NaCl

None of these

Red brass contain about how many percent of zinc.

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20 %

15 %

30 %

25 %

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