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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