Practice Test: Question Set - 01
1. If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
- (A) Disappears
- (B) Becomes
sharper
- (C) Increases
- (D) Decreases
2. To tune a parallel resonant circuit to a higher frequency, the capacitance should be
- (A) Increased
- (B) Decreased
- (C) Left
alone
- (D) Replaced
with inductance
3. A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is
- (A) 12.7 Ω
- (B) 127 Ω
- (C) 4,436 Ω
- (D) 6,174 Ω
4. In a parallel RLC circuit, the smaller reactance determines the net reactance of the circuit.
- (A) True
- (B) False
5. If the value of C in a series RLC circuit is decreased, the resonant frequency
- (A) Is
not affected
- (B) Increases
- (C) Is
reduced to zero
- (D) Decreases
6. A 12 Ω resistor, a 40 μF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is
- (A) 28.1 Hz
- (B) 281 Hz
- (C) 2,810 Hz
- (D) 10 kHz
7. A series resonant circuit is commonly called a tank circuit.
- (A) True
- (B) False
8. In a series RLC circuit that is operating above the resonant frequency, the current
- (A) Lags the
applied voltage
- (B) Leads
the applied voltage
- (C) Is in phase
with the applied voltage
- (D) Is
zero
9. The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 μF, and RW = 90 Ω is
- (A) 0 Ω
- (B) 90 Ω
- (C) 20 Ω
- (D) 40 Ω
10. A 24 Ω resistor, an inductor with a reactance of 120 Ω, and a capacitor with a reactance of 120 Ω are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is
- (A) 60
V
- (B) 660
V
- (C) 30
V
- (D) 300 V
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