# Practice Test: Question Set - 04

**1. Assuming 100% efficiency, what is the power being applied to the primary winding of the transformer described in the above question?**

- (A) 200 W

- (B) 1000 W

- (C) 20 W

- (D) 100 W

**2. The value of a capacitor can be made larger by:**

- (A) Increasing
the area of the plates

- (B) Decreasing
the area of the plates

- (C) Increasing
the frequency of the applied voltage

- (D) Increasing
the voltage applied to the plates

**3. Reducing the amount of current through an inductor:**

- (A) Reduces
the value of inductance by one-half

- (B) Multiplies
the value of inductance by four

- (C) Multiplies
the value of inductance by two

- (D) Has
no effect on the inductance

**4. If a load resistance is 1 kW, a stiff voltage source has a resistance of**

- (A) At least 10
Ohm

- (B) Less than 10
Ohm

- (C) More than
100 k Ohm

- (D) Less than
100 k Ohm

**5. Current and voltage are said to be in phase when:**

- (A) Their
waveforms are both ac or both dc

- (B) They have
the same amplitude and frequency

- (C) Their
waveforms cross through zero and reach positive and negative peaks at the same
time

- (D) None
of the above

**6. Which one of the following statements applies to common, non-rechargeable flashlight batteries?**

- (A) Common
flashlight batteries are secondary wet-cell batteries

- (B) Common
flashlight batteries are primary wet-cell batteries

- (C) Common
flashlight batteries are primary dry-cell batteries

- (D) Common
flashlight batteries are secondary dry-cell batteries

**7. What is the difference between a conductor and an insulator?**

- (A) A conductor
allows current to flow much easier than an insulator does

- (B) An insulator
has an excessive number of free electrons, while a conductor has a few free
electrons or none at all

- (C) An insulator
allows current to flow much easier than a conductor does

- (D) The
difference between conductors and insulators depends on how they are used

**8. When a parallel RLC circuit is operating at its resonant frequency:**

- (A) Capacitive
reactance is greater than the inductive reactance

- (B) Inductive
reactance is greater than the capacitive reactance

- (C) Inductive
reactance is equal to the capacitive reactance

- (D) The
difference between inductive and capacitive reactance is equal to the
resistance

**9. A low-pass filter:**

- (A) Passes
lower-frequency signals and reduces higher-frequency signals

- (B) Passes
higher-frequency signals and reduces lower-frequency signals

- (C) Has no
effect on ac signals

- (D) Reduces the level
of all frequencies by a significant amount

**10. Which one of the following statements is true?**

- (A) Inductive
reactance decreases with operating frequency

- (B) Inductive
reactance is at a maximum for dc source voltages

- (C) Inductive
reactance increases with operating frequency

- (D) There
is no meaningful relationship between inductive reactance and operating
frequency

**11. What is the smallest number of polarities required for current flow?**

- (A) One - a
negative terminal

- (B) Two - a
negative terminal and a positive terminal

- (C) Three
- negative, positive and neutral terminals

- (D) Four - two
negative and two positive

**12. The current gain of a transistor is defined as the ratio of the collector current to the**

- (A) Base
current

- (B) Emitter
current

- (C) Supply
current

- (D) Collector
current

**13. A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?**

- (A) 3 V

- (B) 16 V

- (C) 7.5 V

- (D) 8 V

**14. Which one of the following statements is true for the currents in a parallel RL circuit?**

- (A) The
total current is equal to the sum of the currents through the resistance and
inductance

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

- (C) The
total current is less than the sum of the currents through the resistance and
inductance

- (D) The total
current leads the total voltage by less than 90

**15. The equivalent of 1 kV is:**

- (A) 1.00 V

- (B) 1000 V

- (C) 100 mV

- (D) 1000 mV

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