# 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 = I

^{2}R

- (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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