Carbonate conditioning is not done in high pressure boilers because it may lead to caustic embrittlement.

The question below, there is a statement followed by two conclusions numbered I and II. You have to assume everything in the statement to be true. Then consider the 2 conclusion together and decide which of them follows beyond a reasonable doubt from the information given in the statement. Statement: High pressure boilers are hazardous pieces of equipment, which are strictly regulated with special laws. Conclusions: I. If not regulated, high pressure boilers will be easily available in the market II. High pressure boilers are rare.

A

Only conclusion I follows

B

Only conclusion II follows

C

Both conclusion I and II follows

D

Neither conclusion I nor II follows

Which of the following statement(s) is/are correct?
1. If sodium carbonate and washing soda is mixed in water the hardness of water can be removed.
2. The reaction of the chemicals produce sodium sulphate, sodium carbonate and insoluble calcium carbonate.
3. Magnesium sulphate chloride and magnesium carbonate is also produced.
Select the correct answer

A

Only 1

B

1, 2 and 3

C

2 and 3

D

None of these

Which of the following statements is correct about adaptation dependent on observation behaviour? I. Classical conditioning is for conditioning natural behaviour II. Operant Conditioning is for conditioning the behaviour obtained

A

Only I

B

I and II

C

Neither I nor II

D

Only II

Of the 65 cars on a car lot, 45 have air conditioning, 30 have power windows, and 12 have both air conditioning and power windows. how many of the cars on the lot have neither air conditioning nor power windows?

A

2

B

8

C

12

D

18

Which of the following is embrittlement material for liquid metal embrittlement?

A

Gallium

B

Sodium

C

Tin

D

Copper

Very high pressure boilers are usually __________ boilers.

A

Fire tube

B

Water tube

C

Waste heat

D

Natural circulation

A rotary drum filter with 30% submergence is used to filter concentrated aqueous slurry of calcium carbonate containing 15lb of solids per cubic foot of water. The pressure–drop is 2011Hg. If the filter cake contains 50% mixture (wet basis), calculate the filter area required to filter 10 gal/min of slurry. The filter cycle time is 5 min. The specific cake resistance depends on the pressure–drop as: α (ft/lb) = α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance.

A

≅ 88 ft2

B

= α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance. a) ≅ 88 ft2 [ ≅ 86 ft2

C

≅ 82 ft2

D

≅ 90 ft2

What is meant by caustic embrittlement?

A

Decrease in compressive strength due to caustic accumulation

B

The phenomenon of metal to become brittle due to caustic accumulation at the rivets

C

Entrapment of caustic content between atoms to cause brittleness

D

The phenomenon of metal to become more tensile due to caustic accumulation

Which of the following statements is/are correct regarding caustic embrittlement?

A

Mild carbon steels are susceptible to caustic embrittlement

B

It occurs in concentrated hydroxide environment

C

It occurs around the rivets

D

Mild carbon steels are susceptible to caustic embrittlement in concentrated hydroxide environment around the rivets

Which of the following is/are the preventions of caustic embrittlement?

A

Optimize stress concentration

B

Avoid caustic environment

C

Use of nickel-based alloys, avoid caustic environment and optimize stress concentration

D

Use mild carbon steels

Carbonate conditioning is not done in high pressure boilers because it may lead to caustic embrittlement.

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