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A transformer has an efficiency of \(80\text{%}.\) It works at \(40\) kW and \(100\) V. If the secondary voltage is \(240\) V, the current in the secondary coil is nearly:
1. \(40\) A
2. \(133.3\) A
3. \(86.7\) A
4. \(112\) A

Subtopic:  Transformer |
 88%
Level 1: 80%+
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In the circuit shown below what will be the reading of the voltmeter \((V_1)\) and ammeter?
           
1. \(220\) V, \(2\) A
2. \(110\) V, \(2.4\) A
3. \(220\) V, \(2.4\) A
4. \(220\) V, \(1.1\) A
Subtopic:  Different Types of AC Circuits |
 89%
Level 1: 80%+
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In which of the following circuits, maximum power dissipation is observed?
1. Pure resistive circuit
2. Pure capacitive circuit
3. Pure inductive circuit
4. None of the above
Subtopic:  Power factor |
 87%
Level 1: 80%+
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An alternating voltage \(V=V_0\sin(\omega t)\) is applied across a circuit. As a result, a current \(I=I_0\sin\Big(\omega t+\dfrac{\pi}{2}\Big)\) flows in it. The power consumed per cycle is:
1. \(\dfrac{V_0I_0}{2}\) 2. \(\dfrac{V_0I_0}{\sqrt2}\)
3. \(\sqrt2V_0I_0\) 4. zero
Subtopic:  Power factor |
 77%
Level 2: 60%+
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An alternating current in a circuit is given by; \(I=20\sin\left({{100}{\pi}{t}+{0.05}\pi}\right)~\text{A}\). The rms value and the frequency of the current respectively are:
1. \(10\) A and \(100\) Hz
2. \(10\) A and \(50\) Hz
3. \(10\sqrt{2}\) A and \(50\) Hz
4. \(10\sqrt{2}\) A and \(100\) Hz
Subtopic:  RMS & Average Values |
 92%
Level 1: 80%+
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A current \(I=I_0\sin\Big(\omega t-\dfrac{\pi}{2}\Big),\) flows in an AC circuit across which an AC voltage \(E_0+E_0\sin\omega t\) has been applied. The average power \(P\) consumed in the circuit will be:
1. \(\dfrac{E_0I_0}{\sqrt2}\) 2. \(\dfrac{E_0I_0}{2}\)
3. \(\sqrt2E_0I_0\) 4. zero
Subtopic:  Power factor |
 73%
Level 2: 60%+
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An AC supply is connected across a series \(LCR\) circuit. If the capacitor is removed, then which of the following phasor diagram may be correct for the remaining circuit? 
 
1.   2.  
3.    4.  
Subtopic:  Different Types of AC Circuits |
Level 3: 35%-60%
Hints
Which of the following graphs best represents the variation of impedance \((Z)\) in an \(LCR\) series circuit as a function of the frequency \((f)\) of the applied AC source? 
1. 2.
3. 4.
Subtopic:  Different Types of AC Circuits |
 77%
Level 2: 60%+
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A transformer with \(8:1\) turns ratio has \(50~\text{Hz},\) \(100~\text V\) input. The frequency of the output is: 
1. \(40~\text{Hz}\)
2. \(50~\text{Hz}\)
3. \(400~\text{Hz}\)
4. \(500~\text{Hz}\)
Subtopic:  Transformer |
 78%
Level 2: 60%+
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What reading would you expect of a square wave current, switching rapidly between \(+0.5~\text A\) and \(-0.5~\text A,\) when passed through an AC ammeter?
1. zero
2. \(0.5~\text A\)
3. \(0.25~\text A\)
4. \(1.0~\text A\)
Subtopic:  RMS & Average Values |
 52%
Level 3: 35%-60%
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