# 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**

- (A) Load
resistance

- (B) Half
the load resistance

- (C) Internal
resistance of a Morton circuit

- (D) Open-load
resistance

**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**

- (A) Shorted-load
current

- (B) Open-load
current

- (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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