Materials and Construction

331. Specify the material of construction suitable for handling concentrated HNO3 at 100°C.

1. High silicon iron, Kel-F and Teflon
2. Tin and wood
3. Silicone rubber
4. Stainless steel

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332. Spray dryer for evaporating milk to produce milk powder is made of

1. Lead lined steel
2. Stainless steel
3. Aluminium
4. Cast iron

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333. Stainless steel contains

1. Chromium and nickel
2. Copper
3. Aluminium
4. Vanadium

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334. Stainless steel is not corroded by

1. Hydrochloric acid (10%)
2. Nitric acid (10%)
3. Sulphuric acid (10%)
4. Saturated brine

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335. Steel balls for ball bearings are generally made of _________ steel.

1. Cast
2. Stainless
3. Free carbon
4. Carbon chrome

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336. Steel pipes are normally manufactured by _________ process.

1. Extrusion
2. Cold working
3. Forging
4. Electroforming

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337. Steel rods are used in reinforced concrete to increase its _________ strength.

1. Shear
2. Tensile
3. Compressive
4. None of these

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338. Steel tower used for the storage of oleum

1. Is lined with lead
2. Need not be lined
3. Is lined with rubber
4. Is lined with acid-proof bricks

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339. Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is _________ percent.

1. 0.02
2. 0.2
3. 0.35
4. 0.5

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340. Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)?

1. Armature of small motors/generators
2. Generators and small motors
3. Induction motors
4. High frequency transformers

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