A. State True or False for the following questions. (i) Total impedance in a ser

Question

A. State True or False for the following questions. (i) Total impedance in a series circuit is the sum of all impedances. ii) Rectifier is a device, which converts DC to AC iia) Semiconductor diode conducts curent in both directions (iv) Semiconductor diode conducts in forward biased condition (v) Real power represents the rate of energy conversion by the load (vi Reactive power indicates the power exchange needed for the inductive field or capacitive field (vii) Apparent power must be used to size the cable for power delivery by the cable to certain load. B. Choose the correct answer. (vil) Power factor can be expressed by Reactive Pow d None of the above ix) Unit for apparent power is e. Vol-Ampere (VA) Watt (w) g Voll-Ampere-Reactive (VAR) h. None of the above x) Unit for real power is i Vol-Ampere (VA) k. L Watt (W) Voll-Ampere-Reactive (VAR) None of the above (xi) A P-type semiconductor is fomed by adding small amount of impurities with m. 2 valance electron n. 3 valance electron o. 4 valance electron p 5 valance electron xii AN- type semiconductor is formed by adding small amount of impurities with a. 2 valance electron b. 3 valance electrorn e. 4 valance electron d. 5 valance electron ( Majority current carriers in a P-type semiconductor are a. Holes b. Electrons c. Both a and b d. None of the above Majority current carriers in a N-type semiconductor are a. (xiv) b. e. d. Average value of the output voltage of a half wave rectifier is Holes Electrons Both a and b None of the above (xv) d.

Explanation / Answer

i) True: Total impedence is equal to sum of indivisual impedence.

ii) False: Rectifier is used to conver to AC to DC.

iii)False: Semiconductor Diode is used for current flowing in only one direction.

iv) False: It can be used in reversed biased also such like zener diode.

v) True: It is the actual power which is useful for doing work.

vi) True

vii) True

viii) a: Power factor is defined as ratio of real power flowing to the load to apparent power in the circuit. It is dimentionless parameter between -1 to 1. 1 power factor means all power is real which is useful power.

ix) e: Because it is the product of rms voltage and rms current.

x) j: real power is actual power supplied to load which is in watts.

xi) n: Because P type semiconductor conducts by holes

xii) d: N type semiconductor conducts by electron.

xiii) a: because it is doping with 3 valence electron.

xiv) b: because it is doping with 5 valence electron.

xv) a

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