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Electrical Engineering
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Energy and Power
See What Others Are Saying!
Question
A half-watt is equal to how many milliwatts?
Options
A. 5,000 mW
B. 5 mW
C. 500 mW
D. 50 mW
Correct Answer
500 mW
More questions
1. In a △-connected source feeding a Y-connected load,
Options
A. each phase voltage equals the difference of the corresponding load voltages
B. each phase voltage equals the corresponding load voltage
C. each phase voltage is one-third the corresponding load voltage
D. each phase voltage is 60° out of phase with the corresponding load voltage
Show Answer
Scratch Pad
Discuss
Correct Answer: each phase voltage equals the difference of the corresponding load voltages
2. The reactive voltages,
V
L
and
V
C
, cancel at resonance.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
3. Find the node voltage
V
A
.
Options
A. 6 V
B. 12 V
C. 4.25 V
D. 3 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 4.25 V
4. The Norton equivalent current is
Options
A. the current through the load
B. the open-current from the source
C. the short circuit current
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: the short circuit current
5. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency
Options
A. is 7 kHz
B. is 10 kHz
C. is 12 kHz
D. cannot be determined
Show Answer
Scratch Pad
Discuss
Correct Answer: is 12 kHz
6. A signal with a 400 µs period has a frequency of
Options
A. 250 Hz
B. 2,500 Hz
C. 25,000 Hz
D. 400 Hz
Show Answer
Scratch Pad
Discuss
Correct Answer: 2,500 Hz
7. The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates
Options
A. 12 W
B. 48 W
C. 3 W
D. 8 W
Show Answer
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Discuss
Correct Answer: 3 W
8. A three-phase generator is connected to three 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
Options
A. 0 A
B. 1.33 A
C. 3.99 A
D. 2.66 A
Show Answer
Scratch Pad
Discuss
Correct Answer: 0 A
9. A balanced Wheatstone bridge consists of an
R
V
of 3,500 Ω, an
R
2
of 200 Ω, and an
R
3
of 680 Ω. The value of
R
UNK
is
Options
A. 680 Ω
B. 1,029 Ω
C. 200 Ω
D. 880 Ω
Show Answer
Scratch Pad
Discuss
Correct Answer: 1,029 Ω
10. Electromagnetic induction is the force that produces a magnetic field.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
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Alternating Current and Voltage
Branch, Loop and Node Analyses
Capacitors
Circuit Theorems and Conversions
Circuit Theorems in AC Analysis
Energy and Power
Inductors
Magnetism and Electromagnetism
Ohm's Law
Parallel Circuits
Passive Filters
Quantities and Units
RC Circuits
RL Circuits
RLC Circuits and Resonance
Series Circuits
Series-Parallel Circuits
Three-Phase Systems in Power Applications
Time Response of Reactive Circuits
Transformers
Voltage, Current and Resistance