The voltage reading on the voltmeter V in the circuit shown below will be: 
  
1.  zero

2.  100 V

3.  200 V

4.  300 V

Subtopic:  Different Types of AC Circuits |
 71%
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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

Subtopic:  Transformer |
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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

 

Subtopic:  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

Subtopic:  LC Oscillations (OLD NCERT) |
 73%
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When the speed of a dc motor increases the armature current 

(1) Increases

(2) Decreases

(3) Does not change

(4) Increases and decreases continuously

Subtopic:  DC Generator & Motor (OLD NCERT) |
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An electric motor operating on a 60 V dc supply draws a current of 10 A. If the efficiency of the motor is 50%, the resistance of its winding is 

(1) 3Ω

(2) 6Ω

(3) 15Ω

(4) 30Ω

Subtopic:  DC Generator & Motor (OLD NCERT) |
 65%
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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

Subtopic:  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

Subtopic:  RMS & Average Values | Different Types of AC Circuits |
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The impedance of a coil, when DC supply is replaced by AC supply:
1. will remain the same
2. will increase
3. will decrease
4. will be zero

Subtopic:  AC vs DC |
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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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