Discussion
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- Question
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
Options- A. resistance
- B. arc
- C. low frequency induction
- D. none of these
- Correct Answer
- arc
- 1. Maximum thermal efficiency of boiler may be about __________ percent.
Options- A. 10
- B. 25
- C. 65
- D. 90 Discuss
- 2. Which of the following is a batch furnace?
Options- A. Cupola
- B. Reheating furnace
- C. Glass tank furnace
- D. None of these Discuss
- 3. Purchased cost of equipments for a chemical process plant ranges from __________ percent of the fixed capital investment.
Options- A. 10 to 20
- B. 20 to 40
- C. 45 to 60
- D. 65 to 75 Discuss
- 4. Relative cost of chemical process plants in India is about __________ percent more than the similar plants in U.S.A.
Options- A. 15
- B. 35
- C. 55
- D. 75 Discuss
- 5. An investment of Rs. 100 lakhs is to be made for construction of a plant, which will take two years to start production. The annual profit from the operation of the plant is Rs. 20 lakhs. What will be the pay back time?
Options- A. 5 years
- B. 7 years
- C. 12 years
- D. 10 years Discuss
- 6. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?
Options- A. Low reactivity of carbonised residue containing high proportion of iron & sulphur.
- B. Low forced draft & fuel bed temperature.
- C. Thick firebed and preheated primary air.
- D. All (a), (b) and (c). Discuss
- 7. Rotary kilns are used in the
Options- A. calcination of limestone & dolomite.
- B. cement manufacture.
- C. both (a) and (b).
- D. neither (a) nor (6). Discuss
- 8. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
Options- A. 350
- B. 750
- C. 1050
- D. 1250 Discuss
- 9. Very high pressure boilers are usually __________ boilers.
Options- A. fire tube
- B. water tube
- C. waste heat
- D. natural circulation Discuss
- 10. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
Options- A. Economiser.
- B. Regenerator.
- C. Ceramic recuperator.
- D. Waste heat boiler. Discuss
Furnace Technology problems
Search Results
Correct Answer: 90
Correct Answer: Cupola
Correct Answer: 20 to 40
Correct Answer: 35
Correct Answer: 7 years
Correct Answer: All (a), (b) and (c).
Correct Answer: both (a) and (b).
Correct Answer: 750
Correct Answer: natural circulation
Correct Answer: Regenerator.
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