Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be

Segar cones are used for the determination of __________ of refractories.

A

Softening temperature

B

Spalling resistance

C

Electrical conductivity

D

Resistance to slag attack

Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer :

Statement : The integrated steel plants in India would no longer have to depend on imports for continuous casting refractories.

Assumptions :
I. Continuous casting refractories are needed by India.
II. Continuous casting refractories are in demand.

A

Only assumption I is implicit

B

Only assumption II is implicit

C

Either I or II is implicit

D

Neither I nor II is implicit

E

Both I and II are implicit

Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.

A

1520

B

1630

C

1670

D

1730

PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.

A

1520

B

1630

C

1670

D

1730

A cylindrical stainless steel (k = 25 W/m K) ingot, 10 cm in diameter and 25 cm long, passes through a heat treatment furnace which is 5 meter in length. The initial ingot temperature is 90 degree Celsius, the furnace gas is at 1260 degree Celsius and the combined radiant and convective surface coefficient is 100 W/m2 K. Determine the maximum speed with which the ingot moves through the furnace if it must attain 830 degree Celsius temperature. Take thermal diffusivity as 0.45 * 10 -5 m2/s

A

. 000116 m/s

B

.000216 m/s

C

. 000316 m/s

D

. 000416 m/s

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

A

1800

B

2200

C

2400

D

2700

Two long rods A and B of the same diameter have thermal conductivities k and 4k and have one of their end inserted into a furnace at 400 K. At 9.5 m away section from the furnace, the temperature of rod B is120 degree Celsius. So find out at what end from the furnace end, the same temperature would be reached in the rod A?

A

0.25 m

B

0.75 m

C

0.15 m

D

0.50 m

Each of the questions below consists of a question and three statements numbered I, II and III given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read all the three statements and give answer. There are six letters E, I, P, G, N and O is PIGEON the word formed after performing the following operations using these six letters only? I. O is placed fourth to the right of P. G is not placed immediately next to either P or O. II. N is placed immediately next (either left or right) to O. E is placed immediately next (either left or right) to G. III. Both I and E are placed immediately next to G. The word does not begin with N. P is not placed immediately next to E.

A

If the data in statement I and II are sufficient to answer the question, while the data in statement III alone are not sufficient to answer the question.

B

If the data in statement I and III are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question.

C

If the data in statement II and III are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.

D

If the data either statement I alone or statement II alone or statement III alone are sufficient to answer the question.

Faster rate of drying of moulded refractories results in high __________ of refractories.

A

Green strength

B

Voids

C

Shrinkage

D

Both B and C

Silica refractories are also known as ______ refractories.

A

Acid

B

Basic

C

Neutral

D

Magnesia

Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be

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