Electronic Principles Fundamentals MCQ - Set 12 - ObjectiveBooks
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# Practice Test: Question Set - 12

1. If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage?
(A) 0 V
(B) 36 V
(C) 40 V
(D) 60 V

2. When the collector current increases, what does the current gain do?
(A) Decreases
(B) Stays the same
(C) Increases
(D) None of the above

3. An ideal voltage source has
(A) Zero internal resistance
(B) Infinite internal resistance

4. Which one of the following statements best applies to a parallel RLC circuit?
(A) The voltage waveform for each component always has the same amplitude and phase as the applied voltage
(B) The sum of the current is always less than the applied current
(C) The current waveform for each component always has the same amplitude and phase as the applied current
(D) All of the above

5. Which one of the following statements is true for the currents in a series RC circuit?
(A) The current always has the same amplitude and phase for every part of the circuit
(B) The total current is equal to the sum of the currents for the resistance and capacitance
(C) The total current is greater than the sum of the currents for the resistance and capacitance
(D) The total current is less than the sum of the currents for the resistance and capacitance

6. The knee voltage of a diode is approximately equal to the
(A) Applied voltage
(B) Barrier potential
(C) Breakdown voltage
(D) Forward voltage

7. Which one of the following statements most accurately describes the nature of inductive reactance?
(A) Inductive reactance is an opposition to current flow in dc circuits
(B) Inductive reactance is an opposition to current flow in ac circuits
(C) Inductive reactance is another term for counter emf
(D) Inductive reactance is a force that tends to overcome the effects of counter emf

8. The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
(A) 250 μA
(B) 350 μA
(C) 0.25 μA
(D) 300 μA

9. The direction of conventional current flow is:
(A) From negative to positive
(B) From positive to negative
(C) From left to right
(D) From neutral to positive

10. Which one of the following statements is true for current flowing in a parallel circuit?
(A) The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
(B) The same current always flows through every part of a parallel circuit
(C) The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
(D) The total current in a parallel circuit is always less than the smallest amount of current

11. What is the phase shift between total current and voltage, if 100 ohm resistor connected in parallel with an inductor that has a reactance of 200W?
(A) 0 degree
(B) 26.6 degree
(C) 90 degree
(D) 180 degree

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

13. What is the inductive reactance of a 2-H coil operating at 60 Hz?
(A) 754 Ohm
(B) 30 Ohm
(C) 60 Ohm
(D) 120 Ohm

14. Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
(A) Ammeter
(B) Voltmeter
(C) Ohmmeter
(D) Wattmeter

15. Inductive reactance is measured in units of:
(A) Volts per second
(B) Amperes per second
(C) Ohm
(D) Henrys

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