Chemical Engineering Basics

371. Joule-Thomson co-efficient is the ratio of

1. Pressure change to temperature change occuring during adiabatic compression of a gas
2. Pressure change to temperature change occuring during adiabatic throttling of a gas
3. Temperature change to pressure change occuring during adiabatic compression of a gas
4. Temperature change to pressure change occuring during adiabatic throttling of a gas

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372. L.D. (Linz-Donawitz) converter is used in the production of

1. Copper
2. Steel
3. Zinc
4. Aluminium

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373. Lap joints are preferred over butt joints in soldering/brazing, because these joints are

1. Weaker in tension but stronger in shear
2. Weaker in shear but stronger in tension
3. Stronger in both shear and tension
4. The lap joints are easily made

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

1. Flanged iron
2. Collar
3. Flexible
4. Expansion

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375. Large scale fire on fuel gas line is normally extinguished by

1. Water
2. Steam
3. Foam
4. Nitrogen

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376. Larger length & diameter water pipes are made by

1. Electrical resistance welding
2. Die casting
3. Semi-centrifugal casting
4. Continuous casting

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377. Laser is a device to produce

1. Gamma rays
2. Microwaves
3. A beam of white light
4. A beam of coherent light

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378. Laser welding is widely employed in the __________ industries.

1. Electronic
2. Structural
3. Process
4. Heavy

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379. Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.

1. Decreases
2. Increases
3. Remain same
4. May increase or decrease

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380. Lead is added to 60:40 brass primarily to improve

1. Machinability
2. Corrosion resistance
3. Fluidity
4. Strength

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