In chemical process equipments, the conical bottom heads used, usually has an apex angle of____________________?

Related Mcqs:

1. Bottom of basic open hearth furnace are constructed of__________________?

   A. Dead burnt magnesite ramming mass
   B. Porous fireclay bricks
   C. Semi-silica bricks
   D. Silicon carbide bricks

2. Which of the following has the lowest electrical resistivity ?

   A. Graphite
   B. Fireclay
   C. Alumina
   D. Zircon

3. An ideal refractory should have high__________________?

   A. Spalling rate
   B. Fusion point
   C. Shrinkage ability
   D. None of these

4. _____________ nozzles are used in continuous casting of steel?

   A. Zircon
   B. Thoria
   C. Carborundum
   D. Beryllia

5. Which of the following impurities reduces the refractoriness of magnesite bricks ?

   A. Al2O3
   B. CaO
   C. SiO2
   D. All A., B. & C.

6. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?

   A. Tar bonded dolomite bricks
   B. Fireclay bricks
   C. Mullite bricks
   D. Magnesite bricks

7. Porosity of silica bricks varies from ______________ percent?

   A. 5 to 10
   B. 20 to 30
   C. 45 to 60
   D. 60 to 75

8. Ganister is a source of the ________________?

   A. Silica
   B. Periclase
   C. Lime
   D. None of these

9. Zirconia refractories are not used in_____________________?

   A. Making sheaths for thermocouple
   B. Lining high temperature ceramic kilns
   C. Furnaces subjected to fluctuating temperature
   D. High frequency induction furnaces in the form of inductors

10. Fireclay bricks is not used for lining the__________________?

    A. Cupola
    B. Gas producer
    C. Bottom of hot metal mixer
    D. Roof of open hearth furnace