# A power transformer is used to step up an alternating e.m.f. of 220 V to 11 kV to transmit 4.4 kW of power. If the primary coil has 1000 turns, what is the current rating of the secondary ? Assume 100% efficiency for the transformer  (1) 4 A (2) 0.4 A (3) 0.04 A (4) 0.2 A

Subtopic:  Transformer |
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The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an ac supply of 20 V, 50 Hz. The secondary will have an output of

(1) 200 V, 50 Hz

(2) 2 V, 50 Hz

(3) 200 V, 500 Hz

(4) 2 V, 5 Hz

Subtopic:  Transformer |
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A step-down transformer is connected to main supply 200V to operate a 6V, 30W bulb. The current in primary is

(1) 3 A

(2) 1.5 A

(3) 0.3 A

(4) 0.15 A

Subtopic:  Transformer |
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A transformer has 100 turns in the primary coil and carries 8 A current. If input power is one kilowatt, the number of turns required in the secondary coil to have 500V output will be

(1) 100

(2) 200

(3) 400

(4) 300

Subtopic:  Transformer |
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The potential difference V and the current i flowing through an instrument in an ac circuit of frequency f are given by $V=5\mathrm{cos}\omega \text{\hspace{0.17em}}t$ volts and I = 2 sin ωt amperes (where ω = 2πf). The power dissipated in the instrument is

(1) Zero

(2) 10 W

(3) 5 W

(4) 2.5 W

Subtopic:  Different Types of AC Circuits |
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A generator produces a voltage that is given by V = 240 sin 120 t, where t is in seconds. The frequency and r.m.s. voltage are

(1) 60 Hz and 240 V

(2) 19 Hz and 120 V

(3) 19 Hz and 170 V

(4) 754 Hz and 70 V

Subtopic:  RMS & Average Values |
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The peak value of an alternating e.m.f. E is given by $E={E}_{0}\mathrm{cos}\omega \text{\hspace{0.17em}}t$ is 10 volts and its frequency is 50 Hz. At time $t=\frac{1}{600}sec$, the instantaneous e.m.f. is

(1) 10 V

(2) $5\sqrt{3}\text{\hspace{0.17em}}V$

(3) 5 V

(4) 1 V

Subtopic:  Different Types of AC Circuits |
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If a current I given by ${I}_{0}\mathrm{sin}\text{\hspace{0.17em}}\left(\omega \text{\hspace{0.17em}}t-\frac{\pi }{2}\right)$ flows in an ac circuit across which an ac potential of $E={E}_{0}\mathrm{sin}\omega \text{\hspace{0.17em}}t$ has been applied, then the power consumption P in the circuit will be

(1) $P=\frac{{E}_{0}{I}_{0}}{\sqrt{2}}$

(2) $P=\sqrt{2}{E}_{0}{I}_{0}$

(3) $P=\frac{{E}_{0}{I}_{0}}{2}$

(4) P = 0

Subtopic:  Different Types of AC Circuits |
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A resistance of 20 ohms is connected to a source of an alternating potential, V = 220sin(100πt). The time taken by the current to change from its peak value to its r.m.s value will be:

1. 0.2 sec

2. 0.25 sec

3. 25 × 10–3 sec

4. 2.5 × 10–3 sec

Subtopic:  RMS & Average Values |
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An alternating current of frequency ‘f’ is flowing in a circuit containing a resistance R and a choke L in series. The impedance of this circuit will be:

1. R + 2πfL

2. $\sqrt{{R}^{2}+4{\pi }^{2}{f}^{2}{L}^{2}}$

3. $\sqrt{{R}^{2}+{L}^{2}}$

4. $\sqrt{{R}^{2}+2\pi fL}$

Subtopic:  Different Types of AC Circuits |
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