The r.m.s value of current for

l= 3sinωt + 4 cosωt is 

1. 5 A

2. 52 A

3. 52A

4. 72A

Subtopic:  RMS & Average Values |
 76%
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If ω1 and ω2 are half power frequencies of a series LCR circuit, then resonant frequency ωr can be expressed as

1. ωr=ω1+ω22
2. ωr=ω1ω2
3. ωr=ω12+ω222
4. ωr=ω1ω2ω1+ω2

Subtopic:  Different Types of AC Circuits |
 52%
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Voltage and current in an ac circuit are given by \(V=5sin\left ( 100\pi t-\frac{\pi }{6}~ \right )~V\) and \(I=4sin\left ( 100\pi t+\frac{\pi }{6}~ \right )~A.\)
Hence:

1. The voltage leads the current by 30°.
2. The current leads the voltage by 30°.
3. The current leads the voltage by 60°.
4. The voltage leads the current by 60°.

Subtopic:  RMS & Average Values |
 71%
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The r.m.s. voltage of the waveform shown is:

1. 10 V

2. 6.37 V

3. 7 V

4. 10.5 v

Subtopic:  RMS & Average Values |
 51%
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If potential differences measured in ac voltmeters across the inductor, capacitor, and resistor in series LCR ac circuit are 100 V, 100 V, and 50 v respectively, then the peak value of the applied ac voltage to the circuit is

1. 50 V

2. 502 V 
3. 502 V 
4. 100π V

Subtopic:  RMS & Average Values |
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Voltage and current in an A.C. circuit is given by V=20sin(314t) V and l=10sin314t+π3 A.

Wattful current in the circuit is-

1. 10 A 
2. 5 A 
3. 52A 
4. 102A 

Subtopic:  Different Types of AC Circuits |
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Which of the following devices is not based on Faraday's law of electromagnetic induction?

1. AC generator

2. Speedometer

3. Induction motor

4. DC motor

Subtopic:  DC Generator & Motor (OLD NCERT) |
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Current l through an inductor is increasing according to i=2t. Variation of the rate of increment of its energy dudt with time t is correctly shown in the graph
  
1.                2. 
3.               4. 

Subtopic:  LC Oscillations (OLD NCERT) |
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A time-varying current is given by l=5sinωt+π6 Its r.m.s. value is (symbols have usual meanings)

1. 55 A
2. 10 A 
3. 52 A 
4. 152A 

Subtopic:  RMS & Average Values |
 93%
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An alternating voltage V2sinωt at different frequencies is applied across a capacitor C as shown in the figure. Which of the following graphs between RMS current (I)(I) observed by an ammeter and angular frequency ω of voltage is correct?
          
1.              2. 
3.              4. 

Subtopic:  Different Types of AC Circuits |
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