Electronic Principles Multiple Choice Questions and Answers - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. Doubling the operating frequency of a purely capacitive circuit:
(A) Has no effect on the total circuit current
(B) Doubles the amount of total current
(C) Cuts the total current by one-half
(D) Thrice the amount of total current

2. Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?
(A) 5 Ohm
(B) 50 Ohm or more
(C) 100 Ohm
(D) 6 Ohm

3. The venin 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

4. How many types of flow are there in a semiconductor?
(A) 0
(B) 1
(C) 2
(D) 4

5. The north pole of a magnet is the one:
(A) That has its molecules arranged in a random pattern
(B) That would be attracted to the earth's north magnetic pole
(C) That would be repelled by the south pole of another magnet
(D) That would be attracted to the earth's south magnetic pole

6. Which one of the following statements regarding ac circuits is correct?
(A) Current and voltage are in phase through an inductor
(B) Current leads the voltage through an inductor
(C) Current lags the voltage through an inductor
(D) None of the above

7. A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding?
(A) 50 A
(B) 12 A
(C) 5 A
(D) 20 A

8. What is the barrier potential of a silicon diode at room temperature?
(A) 0.7 V
(B) 0.3V
(C) 1 V
(D) 2 mV per degree Celsius

9. What is one important thing transistors do?
(A) Emit light
(B) Amplify weak signals
(C) Regulate voltage
(D) Rectify line voltage

10. A device that converts chemical energy to electrical energy is called a:
(A) Solar cell
(B) Thermocouple
(C) Chemical cell
(D) Electric device

11. When the Q point moves along the load line, the voltage increases when the current
(A) Decreases
(B) Stays the same
(C) Increases
(D) Can be any of above

12. A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?
(A) 700 V
(B) 707 V
(C) 651 V
(D) 208 V

13. Positive ions are atoms that have
(A) Gained a proton
(B) Lost a proton
(C) Gained an electron
(D) Lost an electron

14. Which one of the following statements is true for voltage in a series circuit?
(A) The total voltage is equal to the sum of the individual voltages in a series circuit
(B) The total voltage in a series circuit is equal to the average value of the individual voltages
(C) The total voltage of a series circuit is equal to the total current divided by the total resistance
(D) The total voltage in a series circuit is always less than the value of the smallest voltage

15. Which one of the following statements is true?
(A) Current flows in a capacitor circuit only while ions are permitted to flow through the dielectric material
(B) Current flows in a capacitor circuit only while the charge on the plates is large enough to force the dielectric to conduct electrons
(C) Current can flow in a capacitor circuit, but not through the dielectric material itself
(D) Power returned to the circuit is always greater than the power absorbed

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