Download Quiz 6-2

Quiz 6-2
1) If you triple the rms voltage in an ac circuit, what happens to the maximum voltage?
A) It increases by a factor of 3 .
B) It decreases by a factor of 3 .
C) It decreases by a factor of 3.
D) It increases by a factor of 3.
Answer: D
2) The figure shows a simple ac circuit consisting of an inductor connected across the terminals of an ac generator.
If the frequency of the ac generator is decreased by a factor of four, what will happen to the inductive reactance on
the inductor?
A) It decreases by a factor of four.
B) It decreases by a factor of eight.
C) It increases by a factor of four.
D) It increases by a factor of eight.
Answer: A
3) A series RLC circuit has a 100-Ω resistor, a 0.100-µF capacitor and a 2.00-mH inductor connected across a 120V rms ac voltage source operating at (1000/π) Hz. What is the resonant frequency of this circuit?
A) 70.7 kHz
B) 22.5 kHz
C) 35.3 kHz
D) 11.3 kHz
Answer: D
4) A series RLC circuit has a 100-Ω resistor, 2.0-mH inductor and a 4.0-µF capacitor connected across a 120-V rms
AC source at (1000/π) Hz. What is the power factor of this circuit?
A) 0.54
B) 0.64
C) 0.74
D) 0.84
Answer: B
5) What is the inductive reactance of a 20-mH inductor at a frequency of 60 Hz?
A) 7.5 Ω
B) 0.13 Ω
C) 12 × 10-1 Ω
D) 7.5 mΩ
Answer: A
6) The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the
secondary coil is 2 A, what is the current in its primary coil?
A) 2 A
B) 8 A
C) 1/2 A
D) 4 A
Answer: B
7) The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the
secondary coil is 2 A, what is the current in its primary coil?
A) 2 A
B) 8 A
C) 1/2 A
D) 4 A
Answer: B