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Bond characteristics



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Q1. . How much should fuel oil be added to increase the moulding ability of sand?

(a) 0.01% ? 0.1%
(b) 0.02% ? 0.2%
(c) 0.03% ? 0.3%
(d) 0.04% ? 0.4%

Q2. Which of the following increases the dry strength of the sand?

(a) Iron oxides
(b) Fuel oils
(c) Cereals
(d) Dextrin and molasses

Q3. Pitch maybe used up to what percent?

(a) 1%
(b) 2%
(c) 3%
(d) 4%

Q4. At what temperature is pitch distilled from soft coals?

(a) 400?F
(b) 500?F
(c) 600?F
(d) 700?F

Q5. What is the amount of sea coal needed in cast irons for large green casting moulding sands?

(a) 10%
(b) 15%
(c) 20%
(d) 25%

Q6. What is the amount of sea coal needed in cast irons for small casting moulding sands?

(a) 1%
(b) 2%
(c) 3%
(d) 4%

Q7. For bonding action of clays, what is the amount of water needed?

(a) 1.5%-8%
(b) 3.5%-11%
(c) 4.5%-12%
(d) 5.5%-13%

Q8. What does the clay particle absorb in electrostatic bonding theory?

(a) Complete water
(b) H+ ions
(c) OH?ions
(d) Sand grains

Q9. In which of the following bonding theory, water molecules break down to form H+ and OH- ions?

(a) Electrostatic bonding theory
(b) Hot strength theory
(c) Surface tension theory
(d) Block and wedge theory

Q10. Which of the following is not a bonding theory?

(a) Electrostatic bonding theory
(b) Hot strength theory
(c) Surface tension theory
(d) Block and wedge theory


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0 Answer
515 views

The Molecular Formula Of Chloride Of A Metal M Is MCL3. The Formula Of Its Carbonate Would Be

Modified 243 Year Ago

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243 Year Ago

The Molecular Formula Of Chloride Of A Metal M Is MCL3. The Formula Of Its Carbonate Would Be

0 votes
0 Answer
492 views

Chemical Formula For Calcium Pyrophosphate Is Ca2P2O7. The Formula For Ferric Pyrophosphate Will Be

Modified 243 Year Ago

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243 Year Ago

Chemical Formula For Calcium Pyrophosphate Is Ca2P2O7. The Formula For Ferric Pyrophosphate Will Be

0 votes
0 Answer
438 views

RbO2 Is

Modified 14 Year Ago

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14 Year Ago

RbO2 Is

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0 Answer
431 views

Formula Of A Metallic Oxide Is MO. The Formula Of Its Phosphate Will Be

Modified 243 Year Ago

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243 Year Ago

Formula Of A Metallic Oxide Is MO. The Formula Of Its Phosphate Will Be

0 votes
0 Answer
392 views

Magnesium Reacts With An Element (X) To Form An Ionic Compound. If The Ground State Electronic Configuration Of (X) Is 1s2 2s2 2p3, The Simplest Formula For This Compound Is

Modified 243 Year Ago

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243 Year Ago

Magnesium Reacts With An Element (X) To Form An Ionic Compound. If The Ground State Electronic Configuration Of (X) Is 1s2 2s2 2p3, The Simplest Formula For This Compound Is

0 votes
0 Answer
380 views

The Calculated Bond Order In O2 -ion Is

Modified 14 Year Ago Rachit

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Rachit
14 Year Ago

The Calculated Bond Order In O2 -ion Is

0 votes
0 Answer
372 views

Which Of The Following Is Paramagnetic With Bond Order 0.5?

Modified 14 Year Ago

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14 Year Ago

Which Of The Following Is Paramagnetic With Bond Order 0.5?

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