# Practice Test: Question Set - 12

**1. If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage?**

- (A) 0 V

- (B) 36 V

- (C) 40 V

- (D) 60 V

**2. When the collector current increases, what does the current gain do?**

- (A) Decreases

- (B) Stays the
same

- (C) Increases

- (D) None of the
above

**3. An ideal voltage source has**

- (A) Zero
internal resistance

- (B) Infinite
internal resistance

- (C) A load
dependent voltage

- (D) A
load-dependent current

**4. Which one of the following statements best applies to a parallel RLC circuit?**

- (A) The voltage
waveform for each component always has the same amplitude and phase as the
applied voltage

- (B) The sum of
the current is always less than the applied current

- (C) The current
waveform for each component always has the same amplitude and phase as the
applied current

- (D) All of the
above

**5. Which one of the following statements is true for the currents in a series RC circuit?**

- (A) The
current always has the same amplitude and phase for every part of the circuit

- (B) The
total current is equal to the sum of the currents for the resistance and
capacitance

- (C) The
total current is greater than the sum of the currents for the resistance and
capacitance

- (D) The
total current is less than the sum of the currents for the resistance and
capacitance

**6. The knee voltage of a diode is approximately equal to the**

- (A) Applied
voltage

- (B) Barrier
potential

- (C) Breakdown
voltage

- (D) Forward
voltage

**7. Which one of the following statements most accurately describes the nature of inductive reactance?**

- (A) Inductive
reactance is an opposition to current flow in dc circuits

- (B) Inductive
reactance is an opposition to current flow in ac circuits

- (C) Inductive
reactance is another term for counter emf

- (D) Inductive
reactance is a force that tends to overcome the effects of counter emf

**8. The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?**

- (A) 250 Î¼A

- (B) 350 Î¼A

- (C) 0.25 Î¼A

- (D) 300 Î¼A

**9. The direction of conventional current flow is:**

- (A) From
negative to positive

- (B) From
positive to negative

- (C) From left to
right

- (D) From neutral
to positive

**10. Which one of the following statements is true for current flowing in a parallel circuit?**

- (A) The amount
of current flow through each branch of a parallel circuit can be different,
depending on the resistance of each branch part and the amount of voltage
applied to it

- (B) The same
current always flows through every part of a parallel circuit

- (C) The
total current in a parallel circuit is equal to the total voltage multiplied by
the total resistance

- (D) The
total current in a parallel circuit is always less than the smallest amount of
current

**11. What is the phase shift between total current and voltage, if 100 ohm resistor connected in parallel with an inductor that has a reactance of 200W?**

- (A) 0 degree

- (B) 26.6 degree

- (C) 90 degree

- (D) 180 degree

**12. Which one of the following kinds of materials has the lowest permeability?**

- (A) A
diamagnetic material

- (B) A
paramagnetic material

- (C) A ferromagnetic
material

- (D) All
of the above

**13. What is the inductive reactance of a 2-H coil operating at 60 Hz?**

- (A) 754 Ohm

- (B) 30 Ohm

- (C) 60 Ohm

- (D) 120 Ohm

**14. Which one of the following devices is most often used for measuring opposition to current flow in a circuit?**

- (A) Ammeter

- (B) Voltmeter

- (C) Ohmmeter

- (D) Wattmeter

**15. Inductive reactance is measured in units of:**

- (A) Volts
per second

- (B) Amperes per
second

- (C) Ohm

- (D) Henrys

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