Computer Science Electronic Principles Online Test - Set 04 - ObjectiveBooks

# Practice Test: Question Set - 04

1. Assuming 100% efficiency, what is the power being applied to the primary winding of the transformer described in the above question?
(A) 200 W
(B) 1000 W
(C) 20 W
(D) 100 W

2. The value of a capacitor can be made larger by:
(A) Increasing the area of the plates
(B) Decreasing the area of the plates
(C) Increasing the frequency of the applied voltage
(D) Increasing the voltage applied to the plates

3. Reducing the amount of current through an inductor:
(A) Reduces the value of inductance by one-half
(B) Multiplies the value of inductance by four
(C) Multiplies the value of inductance by two
(D) Has no effect on the inductance

4. If a load resistance is 1 kW, a stiff voltage source has a resistance of
(A) At least 10 Ohm
(B) Less than 10 Ohm
(C) More than 100 k Ohm
(D) Less than 100 k Ohm

5. Current and voltage are said to be in phase when:
(A) Their waveforms are both ac or both dc
(B) They have the same amplitude and frequency
(C) Their waveforms cross through zero and reach positive and negative peaks at the same time
(D) None of the above

6. Which one of the following statements applies to common, non-rechargeable flashlight batteries?
(A) Common flashlight batteries are secondary wet-cell batteries
(B) Common flashlight batteries are primary wet-cell batteries
(C) Common flashlight batteries are primary dry-cell batteries
(D) Common flashlight batteries are secondary dry-cell batteries

7. What is the difference between a conductor and an insulator?
(A) A conductor allows current to flow much easier than an insulator does
(B) An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
(C) An insulator allows current to flow much easier than a conductor does
(D) The difference between conductors and insulators depends on how they are used

8. When a parallel RLC circuit is operating at its resonant frequency:
(A) Capacitive reactance is greater than the inductive reactance
(B) Inductive reactance is greater than the capacitive reactance
(C) Inductive reactance is equal to the capacitive reactance
(D) The difference between inductive and capacitive reactance is equal to the resistance

9. A low-pass filter:
(A) Passes lower-frequency signals and reduces higher-frequency signals
(B) Passes higher-frequency signals and reduces lower-frequency signals
(C) Has no effect on ac signals
(D) Reduces the level of all frequencies by a significant amount

10. Which one of the following statements is true?
(A) Inductive reactance decreases with operating frequency
(B) Inductive reactance is at a maximum for dc source voltages
(C) Inductive reactance increases with operating frequency
(D) There is no meaningful relationship between inductive reactance and operating frequency

11. What is the smallest number of polarities required for current flow?
(A) One - a negative terminal
(B) Two - a negative terminal and a positive terminal
(C) Three - negative, positive and neutral terminals
(D) Four - two negative and two positive

12. The current gain of a transistor is defined as the ratio of the collector current to the
(A) Base current
(B) Emitter current
(C) Supply current
(D) Collector current

13. A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
(A) 3 V
(B) 16 V
(C) 7.5 V
(D) 8 V

14. Which one of the following statements is true for the currents in a parallel RL circuit?
(A) The total current is equal to the sum of the currents through the resistance and inductance
(B) The current always has the same amplitude and phase for every part of the circuit
(C) The total current is less than the sum of the currents through the resistance and inductance
(D) The total current leads the total voltage by less than 90

15. The equivalent of 1 kV is:
(A) 1.00 V
(B) 1000 V
(C) 100 mV
(D) 1000 mV

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