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Refractory Technology
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Question
Roof of a basic electric furnace is made of __________ bricks.
Options
A. superduty fireclay
B. silica
C. chromite
D. none of these
Correct Answer
silica
More questions
1. During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
Options
A. filtration
B. digestion
C. sedimentation
D. both (b) and (c)
Show Answer
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Discuss
Correct Answer: both (b) and (c)
2. Sillimanite is a __________ refractory.
Options
A. basic
B. neutral
C. high alumina
D. insulating
Show Answer
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Discuss
Correct Answer: high alumina
3. In catalytic alkylation, higher iso-butane to olefin ratio gives
Options
A. low final boiling point product
B. higher yield
C. both (a) and (b)
D. neither (a) nor (b)
Show Answer
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Discuss
Correct Answer: low final boiling point product
4. Pick out the symbol for "locally mounted instrument" in instrumentation diagram.
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
5. Paraffin base crude oil as compared to asphalt base crude gives
Options
A. higher yield of straight run gasoline.
B. higher octane number gasoline.
C. lower viscosity index lube oil.
D. poorer yield of lube oil.
Show Answer
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Discuss
Correct Answer: higher yield of straight run gasoline.
6. Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by
Options
A. filling nitrogen under pressure in the stem.
B. increasing the diameter of the tube.
C. using steel tube in place of glass tube.
D. accounting for the tube expansion.
Show Answer
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Discuss
Correct Answer: filling nitrogen under pressure in the stem.
7. For measuring the temperature of a red hot furnace, which is the most suitable instrument?
Options
A. Platinum resistance thermometer
B. Thermocouple
C. Optical pyrometer
D. Bimetallic thermometer
Show Answer
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Discuss
Correct Answer: Optical pyrometer
8. In second order underdamped system,
Options
A. decay ratio = overshoot
B. decay ratio = (overshoot)
2
C. overshoot increases for increasing damping co-efficient.
D. large damping co-efficient means smaller damping.
Show Answer
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Discuss
Correct Answer: decay ratio = (overshoot)
2
9. The main use of heavy gas oil produced by the vacuum distillation unit is as a
Options
A. blending component for kerosene.
B. blending component for petrol.
C. feedstock for fluid catalytic cracking unit.
D. none of these.
Show Answer
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Discuss
Correct Answer: feedstock for fluid catalytic cracking unit.
10. Catalyst used in the production of high density polythene by low pressure Ziegler process is
Options
A. aluminium triethyl activated with TiCl
4
B. platinum
C. molybdenum
D. Nickel
Show Answer
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Discuss
Correct Answer: aluminium triethyl activated with TiCl
4
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