Related Mcqs:

1. In a furnace employing forced draught as compared to induced draught______________________?

   A. Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
   B. The fan operates hot and hence blades are liable to corrosion and erosion
   C. Positive pressure exists in the furnace
   D. None of these

2. Which one is not an induced draught furnace ?

   A. Blast furnace stove
   B. Sintering furnace
   C. High pressure boiler
   D. None of these

3. Artificial draught produced by a fan in the furnace can be controlled by the___________________?

   A. Speed of the fan
   B. Damper
   C. Variation in the pitch of fan blades
   D. All A., B. and C.

4. 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

5. Forced recirculation of furnace gases is practised_______________?

   A. To increase heat transfer by convection
   B. To ensure uniform temperature
   C. In furnaces, operating below 750°C
   D. All A., B. and C.

6. Regenerators compared to the recuperators for the same duty__________________?

   A. Occupy more space
   B. Are less costly
   C. Are of smaller size
   D. All A., B. and C.

7. Ceramic recuperators compared to metallic recuperators for the same duty_________________?

   A. Are lighter
   B. Occupy more space
   C. Are less costly
   D. Have higher pressure differential between flue gas & air side

8. 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

9. 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.

10. 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