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Identify the correct statements:
P. A reagent could be a collector for one system and a frother for another.
Q. Usage of a frother makes the bubble stable.
R. Usage of a frother makes the mineral surface hydrophobic
S. Some mineral floatation processes will not require any collector.
The figure below shows the cumulative size distribution of particles of a crushed mineral. 10 kg of this material is first passed through a sieve of size 400 micron and then through a sieve of size 300 micron. The weight of mineral (in kg ) that is retained on the 300 micron sieve is . . . . . . . .
Mineral Dressing in Metallurgy mcq question image
The following is a typical anionic collector used in floatation.
What is/are the purpose/purposes of 'District Mineral Foundations' in India? 1. Promoting mineral exploration activities in mineral-rich districts. 2. Protecting the interests of the persons affected by mining operations. 3. Authorizing State Governments to issue licences for mineral exploration. Select the correct answer using the code given below.
The figure below shows a schematic of a water droplet placed on the surfaces of two mineral P and Q.
Mineral Dressing in Metallurgy mcq question image
Given this information, pick the correct statement from the following:
For a narrow base PNP BJT, the excess minority carrier concentrations (ΔnE for emitter, ΔpB for base, ΔnC for collector) normalized to equilibrium minority carrier concentrations (nE0 for emitter, pB0 for base, nC0 for collector) in the quasi-neutral emitter, base and collector regions are shown below. Which one of the following biasing modes is the transistor operating in?
For transistor action (a) Base, emitter, and collector regions should have similar size and doping concentrations. (b) The base region must be very thin and lightly doped. (c) The emitter-base junction is forward biased and the base-collector junction is reverse biased. (d) Both the emitter-base junction as well as the base-collector junction are forward biased. Which one of the following pairs of statements is correct?
Given collector resistance = 2kΩ, load resistance = 5kΩ, collector capacitance = 1μF, emitter capacitance = 20μF, collector current = 2mA, source resistance = 2kΩ. If the effect of blocking capacitor is ignored, find the applicable cut-off frequency.
Given that the collector power dissipation is 300 mW, what is the value of collector current for the collector to emitter voltage = 12 V?
Given that the collector power dissipation is 300 mW, what is the value of collector to emitter voltage for collector current = 50 mA?