1.
The instantaneous voltage and current equation in a series L-C-R ac circuit is: V=200 sin (314t) (V) and i=10 sin(314t- 60⁰), What is the nature of circuit and power factor?
2.
What is the the condition of resonance in LCR seies ac circuit?
3.
A transformer converts high voltage low current into low voltage high current. The transformer is
4.
When the supply frequency is greater than resonant frequency, the LCR series ac circuit is
5.
When inductive reactance is equal to capacitive reactance, the LCR series ac circuit is
6.
The average power is maximum in a LCR series ac circuit, the circuit is
7.
In AC circuit, the wattless circuit in which average power is: (φ = phase difference between voltage and current)
8.
If voltage leads the current by 90⁰ in AC circuit, then the circuit is
9.
In an ac circuit, the ratio of resonant angular frequency to the bandwith is known as
10.
In ac circuit, the instantaneous voltage and current equations are: V= V₀ sin (ωt + 30⁰) and i = I₀ cos ωt. The power facror of the circuit is
11.
The transformation ratio of a transformer having effiency is
12.
Average power in an ac circuit is
13.
The wattless circuit is AC is/are
14.
If V = 220 sin (314 t +15⁰) (volt) and I = 11 sin (314 + 75⁰) (amp), find power factor and impedance of the circuit.
15.
If potential difference across L and C are 60 V ac and 50 V ac respectively. The voltage drop in R is 10 V ac, then the power factor and nature of LCR ac series circuit is
16.
The shape of the graph between capacitive reactance and and frequency is
17.
A bulb is connected in series with an purely inductor across ac voltage. What will be the effect on brightness of the bulb if iron core is inserted in the inductor?
18.
The average value of sin ωt over complete one cycle is
19.
In LCR ac circuit, the potential difference across inductance is equal to the potential difference across C. The circuit will be
20.
A transformer is based on the principle of
21.
The losses in a transformer is/are
22.
For the current I = I₀ sin (314 t), how many times the current will be zero?
23.
In ac frequency 50 c/s, a graph is plotted between current and time. What is the time taken to reach from zero to first positive peak?
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