# 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

- (D) Off
the load line

**13. The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?**

- (A) 14.8 ÂµA

- (B) 10.3 ÂµA

- (C) 7.8 ÂµA

- (D) 7.75 ÂµA

**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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