A 1 kg soil sample has 2 cmolc of Al3+ on the exchange complex. Addition of which of the following would most effectively replace about half of this Al?
A) 2 cmolc Na+
B) 4 cmolc Na+
C) 4 cmolc Ca2+
D) 10 cmolc OH-
E) 1 cmolc K+
C
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Technician A says that a compression test can be used to check the condition of the oil control rings. Technician B says that when several cylinders have low compression test readings, this can be due to burned or tight valves. Who is right?
A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B
Let x(t) and y(t) be as shown in Fig. 15.36, Find z(t) = x(t)*y(t).
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Moisture in a system reacts with refrigerant to form _____
a. an azeotrope b. hydrochloric and hydrofluoric acids c. a non-condensable contaminant d. nitrogen
Whenever the forward-biased SCR in a phase controller is triggered
A) the anode-to-cathode voltage equals the applied voltage B) power is applied to the load C) power to the load is switched off D) the ac waveform switches phase