Chemical Engineering Basics

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

1. Half
2. One third
3. One and half times
4. One fourth

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722. Unbreakable crockeries are made from __________ polymers.

1. Polystyrene
2. Melamine
3. Polystyrene
4. Polyurethane

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723. Uniform ramming of sand in green sand moulding process leads to

1. Reduced chance of gas porosity
2. Greater dimensional stability of the casting
3. Uniform flow of molten metal into the mould cavity
4. Less sand expansion type of casting defect

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724. Unit of surface tension in S.I. unit is

1. Watt/m
2. Joule/m²
3. Newton/m²
4. Joule/m

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725. Unit of viscosity in CGS system is

1. gm .cm^-1 sec^-1
2. gm . cm² . sec^-2
3. gm .cm^-2, sec^-1
4. gm . cm . sec^-1

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726. Upto the critical radius of insulation, added insulation, will

1. Increase the heat loss
2. Decrease heat loss and will have no effect beyond that
3. Decrease heat flux
4. Reduce convection heat loss compared to conduction heat less

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727. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

1. 1
2. 10
3. 30
4. 50

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728. Use of flux during soldering is done to

1. Increase fluidity of solder by lowering its melting temperature
2. Prevent oxide formation
3. Wash away surplus solder
4. Full up the joint gap

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729. Use of water as a manometric liquid suffers from the disadvantage of its

1. Low vapour pressure
2. Corrosive nature
3. High vapour pressure
4. High boiling point

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730. 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)

1. √T
2. 1/√P
3. √y
4. 1/√ρ

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