Chemical Engineering Basics

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

1. Wet
2. Saturated
3. Superheated
4. None of these

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522. Screws are specified by their __________ diameters.

1. Minor
2. Major
3. Pitch
4. None of these

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523. Secondary hardening in steels arises out of the

1. Precipitation of fine alloy carbides at high temperatures
2. Refinement of ferrite grain size by working
3. Decomposition of retained austenite upon heat treatment
4. Precipitation of complex inter-metallic upon heat treatment

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524. Shaft/rotor speed is most accurately measured by a

1. Frequency counter
2. Tachometer
3. Strobometer
4. Speedometer

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525. Shampoos are commercially not available in the form of

1. Powder
2. Gaseous mixture
3. Solution
4. Emulsion

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526. Shrinkage allowance on pattern is provided to compensate for shrinkage when the

1. Metal changes from liquid state to solid state at freezing temperature
2. Solid phase temperature drops from freezing temperature to the room temperature
3. Liquid metal temperature drops from pouring temperature to room temperature
4. Liquid metal temperature drops from pouring temperature to freezing temperature

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527. Silicon crystal can be converted to p-type semi-conductor by doping with

1. Phosphorous
2. Nitrogen
3. Carbon
4. Boron

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528. Silicon in steel

1. Makes it usable in almost all magnetic circuits where alternating current is used
2. Increases its electrical resistivity and decreases the hysteresis loss
3. Is present upto 5% & 4% respectively when used in transformers & motor armatures
4. All 'a', 'b' & 'c'

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529. Silicon percentage in acid resistant cast iron is about

1. 4
2. 8
3. 14
4. 20

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530. Silicon percentage in silicon steel used for electrical equipments is about

1. 1
2. 4
3. 8
4. 14

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