RLC Circuits Objectives PART 06
101 . The shape of impedance versus frequency curve for a parallel resonance circuit is of the
shape as shown in figure A.
102 . The capacitive reactance of a capacitor 1/2Pi F at 10000 H is1/2pi*10000 ohms.
103 . The inductive reactance of an inductance of 1/Pi H at50 H is 100 ohms.
104 . Questions 104 to 110 refer to figure below : For the circuit shown in figure, Q is nearly20.
105. The bandwidth is 80 Hz.
106 . The bandwidth of the circuit can be doubled, while maintaining resonance frequency
unaltered, by increasing R to 100.
107 . In the circuit what will happen when L is increased? Resonance frequency will decrease.
108 . In the circuit what will happen when C is de creased? Q will increase.
109 . Which of the following will not change when input frequency is changed? Bandwidth
,Resonance frequency and Q.
110 . Any reduction in the value ofR will not change Resonance frequency.
111 . Which of the following will not change when E is increased to 24 volts ?Q, Bandwidth and
112 . A parallel resonance circuit consists of a coil with L= 200 mH and R= 60 ohms and a 130 pF
capacitor. The circuit is connected to a 50 mV source. A) The resonance frequency will be 1
113 . Q will be 21.
114 . The current from the source, IT will be1.9μA.
115 . The current through conductor will be 40μA.
116 . The value of inductance necessary to produce series resonance at 100 kHz with a capacitor of 0.001μF is2.5 mH.
117 . A 200 1±H coil has a Q of 250 at resonance frequency of 800 kHz. The effective resistance of coil is4 ohms.
118 . An alternating e.m.f. is applied to a pure inductance such that inductive reactance is 10f2. If the frequency of a.c. is doubled, the reactance will become20 ohms
119 . An alternating e.m.f. is applied to a pure capacitance such that the capacitive reactance is 10 Q. If the frequency of a.c. is doubled, the reactance will become5 ohms.
20 . An inductor allows both ac and dc to pass.