Electromagnetic Induction & Alternating Currents (AIIMS (All India Institute of Medical Sciences) Physics): Questions 23  27 of 51
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Question number: 23
» Electromagnetic Induction & Alternating Currents » LCR Series Circuit
Question
A capacitor of capacitance is connected in the tank circuit of an oscillator oscillating with a frequency of 2 kHz. If the current flowing in the circuit is 5 mA, the voltage across the capacitor will be –
Choices
Choice (4)  Response  

a.  0.133 V 

b.  0.165 V 

c.  81.5 V 

d.  159 V 

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Question number: 24
» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance
Question
The current passing through a choke coil of 12 H is decreasing at the rate of. The emf developing across the coil is –
Choices
Choice (4)  Response  

a.  6 V 

b.  – 6 V 

c.  12 V 

d.  – 12 V 

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Question number: 25
» Electromagnetic Induction & Alternating Currents » LCR Series Circuit
Question
A 50 Hz a. c. source of 30 volts is connected across R and C as shown in figure below. The voltage across R is 13 volts. The voltage across C is nearly –
Choices
Choice (4)  Response  

a.  15 V 

b.  27V 

c.  30 V 

d.  Not possible to determine unless values of R and C are given 

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Question number: 26
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
In an A. C. circuit containing only inductor, the voltage –
Choices
Choice (4)  Response  

a.  Leads the current by 180° 

b.  Leads the current by 90° 

c.  Lags the current by 90° 

d.  Remains in phase with the voltage 

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Question number: 27
» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer
Question
The primary winding of a transformer has 750 turns whereas its secondary has 8250 turns. The primary is connected to a supply of 50 V, 50 Hz. The secondary will have an output of –
Choices
Choice (4)  Response  

a.  11 V, 50 Hz 

b.  5 V, 5 Hz 

c.  550 V, 50 Hz 

d.  550 V, 500 Hz 

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