In the circuit given below, the reading of the voltmeter V will be

             

1.  0

2.  100 V

3.  200 V

4.  300 V

Concept Questions :-

Different types of AC Circuits
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An alternating current is given as i = i1 cos ωt - i2 sin ωt. The rms current is given by

1.  i1 + i22 

2.  i1 + i22

3.  i12 + i222 

4.  i12 + i222

Concept Questions :-

Rms and average values
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In a step-up transformer, the turn ratio is 1:2. A Leclanche cell (e.m.f. 1.5V) is connected across the primary coil. The voltage developed in the secondary coil would be-

1. 3.0 V

2. 0.75 V

3. 1.5 V

4. Zero

Concept Questions :-

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A 220 V, 50 Hz ac source is connected to an inductance of 0.2 H and a resistance of 20 ohms in series. What is the current in the circuit :

1.  10A

2.  5A

3.  33.3A

4.  3.33A

 

Concept Questions :-

Different types of AC Circuits
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If XL = XC then the reading of  ideal voltmeter is: 

                             

1.  V = VL - VC 

2.  V = VR2 + VL2 

3.  V = VR2 + VL - VC2

4.  Zero

Concept Questions :-

LC oscillations
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A step-down transformer is connected to 2400 volts line and 80 amperes of current is found to flow in output load. The ratio of the turns in primary and secondary coil is 20 : 1. If transformer efficiency is 100%, then the current flowing in primary coil will be 

(1) 1600 A

(2) 20 A

(3) 4 A

(4) 1.5 A

Concept Questions :-

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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=5cosωt 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

Concept Questions :-

Different types of AC Circuits
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In an ac circuit, V and I are given by V = 100 sin (100 t) volts, I=100sin100t+π3mA. The power dissipated in circuit is 

(1) 104 watt

(2) 10 watt

(3) 2.5 watt

(4) 5 watt

Concept Questions :-

Rms and average values
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The resistance of a coil for DC is in ohms. In AC, the impedance:

(1) Will remain the same

(2) Will increase

(3) Will decrease

(4) Will be zero

Concept Questions :-

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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

Concept Questions :-

Rms and average values
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