Electronic Principles Objective Practice Test - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
(A) Doping
(B) Valence electrons
(C) Free electrons
(D) Thermal energy

2. If the current gain is 200 and the collector current is 100 mA, the base current is
(A) 2 mA
(B) 0.5 mA
(C) 2 A
(D) 200 A

3. The total capacitive reactance of a parallel capacitor circuit is:
(A) Equal to the sum of the individual capacitive-reactance values
(B) Equal to the sum of the individual capacitance values
(C) Equal to the source voltage divided by total current
(D) Less than the capacitance value of the smallest capacitor

4. Which one of the following statements is true for the voltages in a series RL circuit?
(A) The total voltages is equal to the sum of the voltages across the resistance and inductance
(B) The voltage always has the same amplitude and phase for every part of the circuit
(C) The total voltage is less than the sum of the voltages across the resistance and inductance
(D) The total voltage lags the total current by less than 90

5. The Thevenin resistance is equal in value to the
(C) Internal resistance of a Morton circuit

6. Holes act like:
(A) Atoms
(B) Crystals
(C) Negative charges
(D) Positive charges

7. What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?
(A) 1/4
(B) 1/3
(C) 2
(D) 3

8. Which one of the following principles best describes the basic operation of an electromagnet?
(A) Current is induced in a conductor that is moving through a magnetic field
(B) Like magnetic poles repel, while unlike poles attract
(C) Current flowing through a conductor generates a magnetic field
(D) Like magnetic poles attract, while unlike poles repel

9. When a series RLC circuit is operating at its resonant frequency:
(A) Capacitive reactance is greater than the inductive reactance
(B) Inductive reactance is greater than the capacitive reactance
(C) Inductive reactance is equal to the capacitive reactance
(D) The difference between inductive and capacitive reactance is equal to the resistance

10. An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?
(A) 28.4 mA
(B) 24.2 mA
(C) 34.4 mA
(D) 68.4 mA

11. A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?
(A) 90 Ohm - 101 ohm
(B) 90 Ohm - 110 ohm
(C) 98 Ohm - 100.1 ohm
(D) 99 Ohm - 102 ohm

12. Norton's theorem replaces a complicated circuit facing a load by an
(A) Ideal voltage source and parallel resistor
(B) Ideal current source and parallel resistor
(C) Ideal voltage source and series resistor
(D) Ideal current source and series resistor

13. Which one of the following statements is true?
(A) Power dissipation of a pure capacitor increases with operating frequency
(B) Power dissipation of a pure capacitor decreases with operating frequency
(C) There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency
(D) None of the above

14. The Norton current is sometimes called the
(C) Thevenin current
(D) Thevenin voltage

15. At room temperature an intrinsic silicon crystal acts approximately like
(A) A battery
(B) A conductor
(C) An insulator
(D) A piece of copper wire

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