AC BASICS AND NETWORKS 2

AC BASICS AND NETWORKS

Multiple-choice questions

21. Q-factor of as series R-L-C circuit possessing resonant frequency of 10 Hz and bandwidth of 5 Hz is
a) 0.5
b) 2
c) 2.5
d) 50
ans: b

22. When Q-factor of a circuit is high , then
a) power factor of the circuit is high
b) impedance of the circuit is high
c) bandwidth is large
d) none of the above
ans: b

23. A high  Q coil has
a) large bandwidth
b) high losses
c) low losses
d) flat response
ans: c

24. A coil is tuned to resonance at 500 kHz with a resonating capacitor of 36 pf at 250 kHz , the resonance is obtained with a resonating capacitor of 160 pf .What is the self-capacitance of the coil?
a) 2.66 pf
b) 5.33 pf
c) 8 pf
d) 10.66 pf
ans: b

25. A R-L-C resonant circuit has a resonance frequency of 1.5 MHz and a bandwidth of 10kHz . If c= 150pf, then the effective resistance of the circuit will be
a)  29.5  ohm
b) 14.75 ohm
c) 9.4 ohm
d) 4.7ohm
ans: d