Computer Test Electronic Principles - Set 08 - ObjectiveBooks
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# Practice Test: Question Set - 08

1. What is the algebraic sum of this series of values: +2, -3, -6, +4?
(A) -6
(B) -3
(C) 0
(D) +2

2. Doubling the operating frequency of an inductive circuit:
(A) Has no effect on the inductive reactance
(B) Doubles the amount of inductive reactance
(C) Multiplies the inductive reactance by 6.28
(D) Cuts the inductive reactance in half

3. The basic unit of measurement for current is the:
(A) Volt
(B) Watt
(C) Ampere
(D) Ohm

4. Which is the most widely used semiconductor?
(A) Copper
(B) Silicon
(C) Germanium
(D) None of the above

5. Most AC power is obtained from:
(A) Generators
(B) Batteries
(C) Oscillators
(D) Lightning

6. The emitter diode is usually
(A) Forward-biased
(B) Reverse-biased
(C) Non-conducting
(D) Operating in the breakdwon region

7. The rotating coil of wire in an electric motor is called the:
(A) Armature
(B) Brush
(C) Commutator
(D) Loop

8. Doubling the diameter of the coil in an inductor:
(A) Multiplies the value of inductance by two
(B) Reduces the value of inductance by one-half
(C) Reduces the value of inductance by one-fourth
(D) Multiplies the value of inductance by four

9. Which one of the following devices is most often used for measuring electrical potential difference?
(A) Voltmeter
(B) Ohmmeter
(C) Ammeter
(D) Wattmeter

10. Which one of the following properties of a magnetic circuit can be directly compared to resistance in an electrical circuit?
(A) Reluctance
(B) Permeability
(C) Permeance
(D) Retentivity

11. What is a negative ion?
(A) An atom that contains more electrons than neutrons
(B) An atom that contains more protons than neutrons
(C) An atom that contains more electrons than protons
(D) An atom that contains more protons than electrons

12. If the base supply voltage increases, the Q point moves
(A) Down
(B) Up
(C) Nowhere

13. The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?
(A) 14.8 µA
(B) 10.3 µA
(C) 7.8 µA
(D) 7.75 µA

14. Which one of the following statements is true for the impedance of a series RC circuit?
(A) The impedance is greater than the sum of the resistance and capacitive reactance
(B) The impedance is equal to the sum of the resistance and capacitive reactance
(C) The impedance is greater than either the resistance or capacitive reactance but less than their sum
(D) The impedance is less than the sum of the resistance and capacitive reactance

15. What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?
(A) 77.7 ohm
(B) 89.3 ohm
(C) 88.8 ohm
(D) 224 ohm

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