07. Alternating Current
Question 1. The average value of a cover a Answer: (b) [ML2T-3A-2]
complete cycle is:
(a) l0
Question 6. Energy dissipates in LCR circuit in
(b) l02
:
(c) l0√2
(a) L only
(d) zero
(b) C only
(c) R only
(d) All of the above
Answer: (d) zero
Answer: (c) R only
Question 2. Power factor of an ac circuit is a
measure of:
Question 7. An iron core transformer with a
(a) virtual power
turns ratio of 8 : 1 has 120 V applied across the
(b) power lost in the circuit
primary. The voltage across the
(c) mean power
(a) 15 V
(d) all the above
(b) 120 V
(c) 180 V
Answer: (b) power lost in the circuit (d) 960 V
Question 3. The dimensional formula of L/R is Answer: (a) 15 V
similar to that of:
(a) frequency
Question 8. What is the ratio of inductive and
(b) time
capacitance reactances in an ac circuit?
(c) length
(a) 1
(d) none of these
(b) ω²L
(c) ω²LC
Answer: (b) time (d) l
Question 4. Which of the following has Answer: (c) ω²LC
dimensions different from the rest?
(a) L/R
Question 9. An acceptor circuit is :
(b) 1RC
(a) series resonant circuit
(c) LC−−−√ (b) parallel resonant circuit
(d) RC (c) LCR circuit
(d) None of these
Answer: (b) 1RC
Answer: (a) series resonant circuit
Question 5. The dimensional formula of
impedance is; Question 10. A broadcast circute broadcasts at
(a) [ML2T-2A-2] 300 m band. A condenser of capacitance 2.4
(b) [ML2T-3A-2] lµF is available. The value of the inductance
(c) [ML2T-2A-1] required for resonant circuit is:
(d) [ML2T-2A-3] (a) 10-4 H
Question 1. The average value of a cover a Answer: (b) [ML2T-3A-2]
complete cycle is:
(a) l0
Question 6. Energy dissipates in LCR circuit in
(b) l02
:
(c) l0√2
(a) L only
(d) zero
(b) C only
(c) R only
(d) All of the above
Answer: (d) zero
Answer: (c) R only
Question 2. Power factor of an ac circuit is a
measure of:
Question 7. An iron core transformer with a
(a) virtual power
turns ratio of 8 : 1 has 120 V applied across the
(b) power lost in the circuit
primary. The voltage across the
(c) mean power
(a) 15 V
(d) all the above
(b) 120 V
(c) 180 V
Answer: (b) power lost in the circuit (d) 960 V
Question 3. The dimensional formula of L/R is Answer: (a) 15 V
similar to that of:
(a) frequency
Question 8. What is the ratio of inductive and
(b) time
capacitance reactances in an ac circuit?
(c) length
(a) 1
(d) none of these
(b) ω²L
(c) ω²LC
Answer: (b) time (d) l
Question 4. Which of the following has Answer: (c) ω²LC
dimensions different from the rest?
(a) L/R
Question 9. An acceptor circuit is :
(b) 1RC
(a) series resonant circuit
(c) LC−−−√ (b) parallel resonant circuit
(d) RC (c) LCR circuit
(d) None of these
Answer: (b) 1RC
Answer: (a) series resonant circuit
Question 5. The dimensional formula of
impedance is; Question 10. A broadcast circute broadcasts at
(a) [ML2T-2A-2] 300 m band. A condenser of capacitance 2.4
(b) [ML2T-3A-2] lµF is available. The value of the inductance
(c) [ML2T-2A-1] required for resonant circuit is:
(d) [ML2T-2A-3] (a) 10-4 H
