Computer Science Online Test Electronic Principles - Set 10 - ObjectiveBooks
Computer Science Online Test Electronic Principles - Set 10

Computer Science Online Test Electronic Principles - Set 10

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Practice Test: Question Set - 10

1. When operating below its resonant frequency, a series RLC circuit has the characteristics of a:
    (A) Series RL circuit
    (B) Series RC circuit
    (C) Series RLC circuit operated above its resonant frequency
    (D) Purely resistive circuit
2. Which one of the following statements best describes magnetic hysteresis?
    (A) Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
    (B) Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
    (C) Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
    (D) Hysteresis is most apparent when the core material is saturated
3. The peak value of a sine waveform is:
    (A) The amplitude at 70.7% of the maximum value
    (B) The amplitude at 90% of the maximum value
    (C) The amplitude at 1.41 times the maximum value
    (D) The maximum positive or negative value
4. A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?
    (A) 310 Ohm
    (B) 400 Ohm
    (C) 410 Ohm
    (D) 550 Ohm
5. Which one of the following statements applies to common auto batteries?
    (A) Auto batteries are primary wet-cell batteries
    (B) Auto batteries are secondary wet-cell batteries
    (C) Auto batteries are secondary dry-cell batteries
    (D) Auto batteries are primary dry-cell batteries
6. A battery is a device composed of one or more:
    (A) Chemical cells
    (B) Voltage generators
    (C) Solar cells
    (D) Piezoeletric cells
7. What is the difference between the kinds of charges for an electron and a proton?
    (A) An electron has a positive charge and a proton has no charge
    (B) An electron has a positive charge and a proton has a negative charge
    (C) An electron has a negative charge and a proton has a positive charge
    (D) An electron has a negative charge and a proton has no charge
8. A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?
    (A) 3.75 mA
    (B) 3.2 mA
    (C) 0.05 mA
    (D) 13 mA
9. 1 Microfarad is the same as:
    (A) 1 millionth of a picofarad
    (B) 1000 millifarads
    (C) 1 million picofarads
    (D) 1 million farads
10. A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?
    (A) 60 Ohm
    (B) 50 Ohm
    (C) 100 Ohm or more
    (D) 10 Ohm
11. What is a free electron?
    (A) An electron that has been freed from its parent atom
    (B) An electron that costs nothing
    (C) An electron that has no electrical charge
    (D) An electron that has twice the amount of charge of a normal electron
12. A farad is defined as the amount of capacitance necessary for:
    (A) Dissipating 1 W of power
    (B) Causing an ac phase shift greater than 90 degree
    (C) Storing 1 V for 1 second
    (D) Changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
13. Absolute Zero temperature equals
    (A) 0o C
    (B) –273o C
    (C) –276o C
    (D) 25o C
14. When the graph of current versus voltage is a straight line, the device is referred to as
    (A) Active
    (B) Linear
    (C) Nonlinear
    (D) Bipolar
15. When operating above its resonant frequency, a series RLC circuit has the characteristics of a:
    (A) Series RL circuit
    (B) Series RC circuit
    (C) Series RLC circuit operated below its resonant frequency
    (D) Purely resistive circuit
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