Chemical Engineering MCQs

6108 MCQs  (Page 492 of 611)

Attempt Chemical Engineering Quiz
The rate of scaling of furnace stock depends upon the_________________?
A. Temperature
B. Time
C. Nature of atmosphere
D. All a., b. and c.
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In low or standard frequency induction furnace, heat is produced by the_______________________?
A. Combination of induced current and skin effect
B. Induction and resistance
C. Current flow through a heating element
D. None of these
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The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about ____________ percent?
A. 15
B. 40
C. 70
D. 85
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Neutral atmosphere is maintained in a/an ____________ furnace?
A. Cold rolled steel coil annealing
B. Open hearth
C. Soaking pit
D. Walking beam reheating
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An example of indirectly heated furnace is the_________________?
A. Soaking pit
B. Muffle furnace
C. Reheating furnace
D. None of these
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Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of__________________?
A. Low emissivity
B. High thermal conductivity
C. Both a. and b.
D. Neither a. nor b.
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The resistance furnace produces heat by the__________________?
A. Electric arc struck between electrodes and the charge
B. Flow of current through a heating element
C. Combination of induced current and skin effect
D. None of these
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Dampers are located__________________?
A. Before the i.d fan
B. After the i.d. fan
C. Near the top of the chimney
D. Anywhere after the i.d. fan
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Regenerators as compared to recuperators for the same duty_________________?
A. Store smaller quantity of waste heat
B. Are lighter & compact
C. Involve higher initial cost
D. All a., b. & c.
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The purpose of controlling the furnace atmosphere is to prevent surface attack by__________________?
A. Oxidation/scaling
B. Decarburising
C. Sulphur penetration
D. Either of the above
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Word of the Day
24 Jul
Untenable
(especially of a position or view) not able to be maintained or defended against attack or objection.
ناقابل مدافعت، غیر مستحکم، جو دلیل سے ثابت نہ ہو سکے

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