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Alternating Current
Quiz 1
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The average value of a cover a complete cycle is:
0%
l
0
0%
\(\frac{l_0}{2}\)
0%
\(\frac{l_0}{√2}\)
0%
zero
Explanation
zero
Power factor of an ac circuit is a measure of:
0%
virtual power
0%
power lost in the circuit
0%
mean power
0%
all the above
Explanation
power lost in the circuit
The dimensional formula of L/R is similar to that of:
0%
frequency
0%
time
0%
length
0%
none of these
Explanation
time
Which of the following has dimensions different from the rest?
0%
L/R
0%
\(\frac{1}{RC}\)
0%
\(\sqrt{LC}\)
0%
RC
Explanation
\(\frac{1}{RC}\)
The dimensional formula of impedance is;
0%
[ML
2
T
-2
A
-2
]
0%
[ML
2
T
-3
A
-2
]
0%
[ML
2
T
-2
A
-1
]
0%
[ML
2
T
-2
A
-3
]
Explanation
[ML
2
T
-3
A
-2
]
Energy dissipates in LCR circuit in :
0%
L only
0%
C only
0%
R only
0%
All of the above
Explanation
R only
An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the
0%
15 V
0%
120 V
0%
180 V
0%
960 V
Explanation
15 V
What is the ratio of inductive and capacitance reactances in an ac circuit?
0%
1
0%
ω²L
0%
ω²LC
0%
l
Explanation
ω²LC
An acceptor circuit is :
0%
series resonant circuit
0%
parallel resonant circuit
0%
LCR circuit
0%
None of these
Explanation
series resonant circuit
A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:
0%
10
-4
H
0%
10
-8
H
0%
10
-6
H
0%
10
-2
H
Explanation
10
-8
H
In series resonant circuit:
0%
reactance is zero
0%
current is zero
0%
voltage is zero
0%
None of these
Explanation
None of these
In parallel resonant circuit:
0%
impedance is very high
0%
current is very high
0%
voltage is very high
0%
None of these
Explanation
impedance is very high
The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary isIf 240 V a.c. is applied to primary, the output from the secondary
0%
6 V
0%
12 V
0%
24 V
0%
48 V
Explanation
12 V
Transformer works on the principle of:
0%
convertor
0%
invertor
0%
mutual induction
0%
self-induction
Explanation
mutual induction
Which of the following effects is not shown in alternating current ?
0%
Chemical effect
0%
Magnetic effect
0%
Heating current
0%
All of these
Explanation
Chemical effect
An ac ammeter connected in series in an ac circuit reads 5A. The peak value of current:
0%
5 A
0%
5√2A
0%
\(\frac{5}{√5}\) A
0%
zero
Explanation
5√2A
The phase difference b/w the A.C. and e.m.f. \(\frac{π}{2}\) Which of the following can not be the instituent of the circuit?
0%
LC
0%
L alone
0%
C alone
0%
RL
Explanation
RL
The Q factor of an LCR circuit at resonance is :
0%
\(\sqrt{R^2+ω^2L^2}\)
0%
\(\sqrt{R^2+(\frac{1}{cω}})^2\)
0%
\(\frac{ω_rL}{R}\)
0%
\(\sqrt{R^2+\frac{1}{c^2ω^2}}\)
Explanation
\(\frac{ω_rL}{R}\)
Faraday constant:
0%
depends on the amount of the electrolyte
0%
depends on the current in the electrolyte
0%
is a universal constant
0%
depends on the amount of charge passed through the electrolyte
Explanation
is a universal constant
The natural frequency of an L -C-Circuit is equal to :
0%
\(\frac{\sqrt{LC}}{2π}\)
0%
\(\frac{1}{3π\sqrt{LC}}\)
0%
\(\frac{1}{2π}\sqrt{\frac{L}{C}}\)
0%
\(\frac{1}{2π}\sqrt{\frac{C}{L}}\)
Explanation
\(\frac{1}{3π\sqrt{LC}}\)
0 h : 0 m : 1 s
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