A. Electric spark
B. Corona discharge
C. Alternating current
D. None of these
Related Mcqs:
- Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?
A. 200°C and 5 atm
B. 1000°C and 10 atm
C. 500°C and 50 atm
D. 1000°C and 500 atm - Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?
A. Density separation
B. Differential wettability
C. Size
D. Volatile matter content - Float and sink test determines the possibility of cleaning of coal by a process based on the___________________?
A. Gravity separation
B. Wettability
C. Particle shape
D. None of these - Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?
A. Trough washer
B. Baum jig washer
C. Spiral separator
D. Froth floatation - The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?
A. Bag filter
B. Electrostatic precipitator
C. Cyclone separator
D. Wet scrubber - In froth floatation, chemical agent added to cause air adherence is called___________________?
A. Collector
B. Frother
C. Modifier
D. Activator - Dust laden air can be purified using a____________________?
A. Cyclone separator
B. Bag filter
C. Gravity settler
D. Tubular centrifuge - Close circuit grinding by a ball mill with air sweeping employs a _______________________?
A. Classifier
B. Cyclone separator between mill & classifier
C. Both A. & B.
D. Neither A. nor B. - For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the ______________ filter?
A. Plate & frame
B. Shell & leaf
C. Sand
D. Rotary vacuum - Crushing of mineral particles is accomplished in a ‘cage mill’, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?
A. Impact
B. Roll
C. Vibratory
D. None of these
