Electronic Principles Objective Questions and Answers - ObjectiveBooks
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# Practice Test: Question Set - 16

1. Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
(A) P = I2R
(B) P = IE
(C) P = E2/R
(D) I = P/E

2. How much current flows through a 60-W light bulb that is operating at 120 V?
(A) 0.5A
(B) 180 A
(C) 2 A
(D) 7200 A

3. Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?
(A) 0.17 V
(B) 10.17 V
(C) 20 V
(D) 18.8 V

4. Suppose a voltage source has an ideal voltage of 15V and a source resistance of 0.2W. For what values of load resistance will the voltage source appear stiff?
(A) 20 Ohm
(B) 30 Ohm
(C) 10 Ohm
(D) 100 Ohm

5. A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?
(A) 4.73 V
(B) 0.4 V
(C) 24 V
(D) 600 V

6. The barrier potential across each depletion layer is
(A) 0
(B) 0.8 V
(C) 0.7 V
(D) 20 V

7. The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:
(A) Rotor
(B) Armature
(C) Battery
(D) Commutator

8. Which one of the following statements is true for voltage in a parallel circuit?
(A) The total voltage in a parallel circuit is equal to the average value of the individual voltages
(B) The total voltage in a parallel circuit is always less than the value of the smallest voltage
(C) The total voltage is equal to the sum of the voltages across the individual branches in a parallel circuit
(D) The total voltage of a parallel circuit is the same as the voltages across each branch

9. Which one of the following statements is true for the voltages in a series RC circuit?
(A) The total voltage is equal to the sum of the voltages across the resistance and capacitance
(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 capacitance
(D) The total voltage is greater than the sum of the voltages across the resistance and capacitance

10. The voltage across a 1N4001 is 0.93V when the current is 1A. What is the power dissipation of the diode for these values?
(A) 0.93 W
(B) 0.93 V
(C) 1 A
(D) 9.3 W

11. A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?
(A) 0.1 A
(B) 1000 A
(C) 10 A
(D) 100 A

12. The basic unit of measurement for resistance is the:
(A) Volt
(B) Ampere
(C) Ohm
(D) Watt

13. Waveforms are graphs that show:
(A) Frequency on the vertical axis and amplitude on the horizontal axis
(B) Amplitude on the vertical axis and frequency on the horizontal axis
(C) Amplitude on the vertical axis and the passage of time on the horizontal axis
(D) The passage of time on the vertical axis and amplitude on the horizontal axis

14. Which one of the following kinds of materials has the highest permeability?
(A) A diamagnetic material
(B) A ferromagnetic material
(C) A paramagnetic material
(D) All of the above

15. How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?
(A) 0.02 A
(B) 0.955 A
(C) 10 A
(D) 2.02 A

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