# Practice Test: Question Set - 03

**1. Suppose the peak value of a sinusoidal voltage is 50 V. What is the rms value?**

- (A) 37.4 V

- (B) 35.4 V

- (C) 38.74 V

- (D) 30.4 V

**2. Two diodes are in series. The first diode has a voltage of 0.75 V and the second has a voltage of 0.8 V. If the current through the first diode is 500 mA, what is the current through the second diode**

- (A) 11 mA

- (B) 12 mA

- (C) 10 mA

- (D) 14 mA

**3. Which one of the following principles best describes the basic operation of a generator?**

- (A) Like magnetic
poles repel; unlike poles attract

- (B) Current is
induced in a conductor that is moving through a magnetic field

- (C) Like
magnetic poles attract; unlike poles repel

- (D) Current
flowing through a conductor generates a magnetic field

**4. A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?**

- (A) 200 mW

- (B) 300 mW

- (C) 20 mW

- (D) 10 mW

**5. A basic capacitor is composed of:**

- (A) Two
conductors separated by a dielectric

- (B) Two dielectrics
separated by a conductor

- (C) Two coils
separated by a dielectric

- (D) Two coils
separated by a conductor

**6. The period of a waveform is:**

- (A) The time
required to complete one full cycle

- (B) The number
of cycles completed in one second

- (C) The
time required for the voltage to rise from 10% to 90% of the peak amplitude

- (D) Equal to
0.707 times the peak amplitude

**7. How many protons does the nucleus of a silicon atom contain?**

- (A) 4

- (B) 29

- (C) 14

- (D) 48

**8. Suppose a current source has an Ideal current of 10 mA and an internal resistance of 20 MW. For what values of load resistance will the current source appear stiff?**

- (A) 20
k Ohm or more

- (B) 200 k Ohm or
less

- (C) 200 k Ohm or
more

- (D) 20 km or less

**9. What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W?**

- (A) 692.2 Ohm

- (B) 844.5 Ohm

- (C) 3890 Ohm

- (D) 1234 Ohm

**10. When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:**

- (A) Parallel RL
circuit

- (B) Parallel RC
circuit

- (C) Parallel RLC
circuit operated above its resonant frequency

- (D) Purely
resistive circuit

**11. The merging of a free electron and a hole is called**

- (A) Covalent
bonding

- (B) Lifetime

- (C) Recombination

- (D) Thermal
energy

**12. Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?**

- (A) R = E

^{2}/P

- (B) P = PR

- (C) P = E

^{2}/R

- (D) I = P/E

**13. What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?**

- (A) 100 Ohm

- (B) Less than 1
Ohm

- (C) 628 Ohm

- (D) 444 Ohm

**14. Voltage is**

- (A) The
flow of charged particles through a material

- (B) The smallest
electrically charged particle

- (C) Trie force
that causes electrons to flow

- (D) The
number of free electrons in an atom

**15. Which one of the following statements is true for the voltage in a parallel RL circuit?**

- (A) The
voltage always has the same amplitude and phase for every part of the circuit

- (B) The
total voltage is equal to the sum of the voltages across the resistance and
inductance

- (C) The total
voltage lags the total current by less than 90

- (D) The
total voltages is less than the sum of the voltages across the resistance and
inductance

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