7. The cathode of a Zener diode in a voltage regulator is normally: (a) more positive than the anode (b) more negative than the anode (c) at +0.7 V (d) grounded.
8. For a certain 12 V Zener diode, a 10 mA change in Zener current produces a 0.1 V change in Zener voltage. The Zener impedance for this current range is: (a) 1 Ģ (b) 100 Ģ (c) 10 Ģ (d) 0.1 Ģ.
9. The mobility of electron in material is expressed in unit of: (a) V/s (b) m2/V.s (c) m2/V (d) J/K.
10. The revered biased PN junction, the current through the junction increases abruptly at: (a) breakdown voltage (b) 0V (c) 0.2 eV (d) 7.2 eV.
11. In an intrinsic semiconductor, the number of free electrons (a) Equals the number of holes (b) Is greater than the number of holes (c) Is less than the number of holes (d) None of the above.
12. The battery connections required to forward bias a pn junction are (a) +ve terminal to p and -ve terminal to n (b) -ve terminal to p and +ve terminal to n (c) -ve terminal to p and -ve terminal to n (d) None of the above.