Computer Electronic Principles MCQ Test - Set 03 - ObjectiveBooks

# 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
(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 = E2/P
(B) P = PR
(C) P = E2/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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