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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