Electronic Principles Multiple Choice Tests - Set 06 - ObjectiveBooks

# Practice Test: Question Set - 06

1. The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?
(A) 1750 mA
(B) 17.5 mA
(C) 175 mA
(D) 1.75 mA

2. Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?
(A) E = PR
(B) E = I2R
(C) I = E/R
(D) I = ER

3. Which one of the following statements most accurately reflects the nature of ac power?
(A) The current in an ac circuit flows in one direction, but changes value periodically
(B) The current in an ac circuit flows in one direction at a steady level
(C) The current in an ac circuit changes direction periodically
(D) The current in an ac circuit flows in two directions at the same time

4. Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?
(A) 200 W
(B) 1000 W
(C) 20 W
(D) 100 W

5. Which one of the following statements most accurately applies to the frequency of a waveform?
(A) The actual frequency of a sine waveform is 1.41 times the working frequency
(B) Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
(C) The higher the amplitude of a waveform, the higher its frequency
(D) The longer the period of a waveform, the lower its frequency

6. How may valence electrons does a silicon atom have?
(A) 0
(B) 1
(C) 2
(D) 4

7. How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?
(A) 0.151 mA
(B) 157 mA
(C) 0.995 mA
(D) 2.02 A

8. What is the turns ratio for the transformer specified in the above question?
(A) 10.738
(B) 0.707
(C) 1.5
(D) 0.575

9. The net charge of a neutral copper atom is
(A) 0
(B) +1
(C) -1
(D) +4

10. How much power is being dissipated by a 1000 W resistance that has 25 V applied to it?
(A) 0.24 W
(B) 0.625 W
(C) 80 W
(D) 325 kW

11. Which one of the following statements is true for the voltage in a parallel RC 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 capacitance
(C) The total voltage leads the total current by less than 90 degree
(D) The total voltage is less than the sum of the voltages across the resistance and capacitance

12. Which one of the following properties of a magnetic circuit can be directly compared to current in an electrical circuit?
(A) Number of lines of force
(B) Flux density
(C) Reluctance
(D) Magnetomotive force

13. Which one of the following phrasers best describes flux density?
(A) The concentration of lines of magnetic force
(B) The rate of change of the number of lines of magnetic force
(C) The opposition to a build-up of magnetic fields
(D) The force that maintains lines of force

14. In a step-down transformer, which is larger?
(A) Primary voltage
(B) Secondary voltage
(C) Impossible to say
(D) None of the above

15. When operating below 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

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