While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about _____________ °C?

Related Mcqs:

1. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?

   A. Resistance B. Arc C. Low frequency induction D. None of these...

2. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?

   A. Preheating the combustion air B. Oxygen enrichment of combustion air C. Preheating the fuel gas D. All A., B. & C....

3. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent?

   A. < 2 B. < 5 C. < 8 D. < 10...

4. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?

   A. 5 B. 60 C. 20 D. 40...

5. Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by_________________?

   A. Increasing the draft in the furnace B. Preheating the fuel gas C. Oxygen enrichment of combustion air D. Preheating the combustion air...

6. Pulverised fuel fired furnaces employ ______________ fuel firing?

   A. Horizontal B. Vertical C. Tangential D. All A., B. and C....

7. The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?

   A. Arc B. Resistance C. Low frequency induction D. High frequency induction...

8. _____________ furnace is not an electric furnace?

   A. Arc B. Induction C. Pot D. Resistance...

9. An improved and fuel efficient version of the pusher type reheating furnace is the ______________ furnace?

   A. Walking beam B. Shaft C. Tunnel D. Rotary hearth...

10. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?

    A. 10-15 B. 25-30 C. 45-50 D. 65-70...