For the circuit shown in the figure, the time constant is

1. 1011s
2. 910s
3. 57s
4. 34s

Subtopic:  Different Types of AC Circuits |
 68%
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If i=2t, then the R.M.S. value of current between 0 to 2 second is

1. 23
2. 43
3. 53
4. zero 

Subtopic:  RMS & Average Values |
 67%
From NCERT
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L, C, and R denote inductance, capacitance, and resistance respectively. pick out the combination which does not have the dimension of frequency.

1. 1RC
2. RL
3. 1Lc
4. CL

Subtopic:  Different Types of AC Circuits |
 65%
From NCERT
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The phase difference (ϕ) between emf and current in LCR series a.c. circuit is

1. ϕ= 0
2. 0ϕ<π2
3.π2<ϕ<π
4. ϕ=π

Subtopic:  Different Types of AC Circuits |
 80%
From NCERT
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The primary and secondary coils of an ideal transformer have 100 and 5000 turns respectively. The magnetic flux linking the primary coil is given by ϕ= 20t + 10. The output voltage across the secondary coil is

1. 20 V

2. 500 V

3. 1000 V

4. 10000 V

Subtopic:  Transformer |
 82%
From NCERT
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In the LCR-circuit shown below, if the reading of the voltmeters V1 and V2 are same, then

     

1. ω2=1LC

2. Reading of the voltmeter V is 50 V

3. Reading of the ammeter A is 5 A

4. All of these

Subtopic:  LC Oscillations (OLD NCERT) |
 87%
From NCERT
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If R and L are resistance and inductance of a choke coil and f is the frequency of current through it, then the average power of the choke coil is proportional to:
1.  \(R ~\)
2.  \(\frac{1}{f^2}\)
3.  \(\frac{1}{L^2}\)
4.  All of these

Subtopic:  Power factor |
 64%
From NCERT
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Which of the following is/are copper loss/losses in a transformer?

1. Hysteresis loss

2. Eddy current loss

3. Heat loss in the primary and second coils

4. Both (1) & (2)

Subtopic:  Transformer |
From NCERT
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Half power frequencies for the circuit shown below are 200rad/s and 800 rad/s. The value of the product LC is (is second2/radian2)

1. 6.25 ×10-3
2. 6.25×10-6
3. 1.25×10-3
4. 1.25×10-5

Subtopic:  Different Types of AC Circuits |
 68%
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In the network shown below what is the reading of the a.c voltmeter?
                  
1. Zero

2. 100 V

3. 200 V

4. 500 V

Subtopic:  Different Types of AC Circuits |
From NCERT
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