A. 1
B. 4.0
C. 8
D. 14
Related Mcqs:
- Silicon percentage in the silicon steel used for electrical appliances/equipments is_________________?
A. 0.3-0.4
B. 12-14
C. 3-4
D. 20-25 - Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?
A. Dust catcher (gravity type)
B. Cyclone separator
C. Bag filter
D. Hollow wet scrubber - A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than _______________ percent ?
A. 150
B. 200
C. 300
D. 400 - Addition of silicon to cast iron ___________________?
A. Promotes graphite module formation
B. Improves its ductility
C. Does not promote graphite flakes formation
D. Increases the fluidity of molten metal - Silicon crystal can be converted to p-type semi-conductor by doping with__________________?
A. Phosphorous
B. Nitrogen
C. Carbon
D. Boron - The temperature at which the magnetic property of iron disappears (i.e., it becomes nonmagnetic) and its electrical conductivity & specific heat also changes, is called the ‘Curie point’, which is ________________ °C ?
A. 768
B. 908
C. 1400
D. 1539 - With increase in temperature, the electrical conductivity of semiconductors_____________________?
A. Increases
B. Decreases
C. Remain constant
D. Either A. or B. depends on the type of semi-conductor - The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process ?
A. Cyaniding
B. Sherardizing
C. Spheroidising
D. None of these - Between 230 and 370°C, blue brittleness is caused in mild steel because of the_________________?
A. Immobility of dislocation
B. Strain-ageing
C. Increase in Young’s modulus
D. Strain hardening - Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by_________________?
A. Quenching of hot coke
B. Discharging in the river stream
C. Filtration and recycling for cooling coke oven gas
D. None of these
