Electromagnetic Induction & Alternating CurrentsResonance [NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics]: Questions 1  6 of 7
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Question number: 1
» Electromagnetic Induction & Alternating Currents » Resonance
Question
The coefficient of induction of a choke coil is 0.1 H and resistance is 12Ω. If it is connected to an alternating current source of frequency 60 Hz, then power factor is approximately
Choices
Choice (4)  Response  

a.  0.1  
b.  0.30  
c.  0.2  
d.  0.4 
Question number: 2
» Electromagnetic Induction & Alternating Currents » Resonance
Question
This circuit will resonate at ω equal to,
Choices
Choice (4)  Response  

a.  200 rad s ^{1}  
b.  500 rad s ^{1}  
c.  50 rad s ^{1}  
d.  2000 rad s ^{1} 
Question number: 3
» Electromagnetic Induction & Alternating Currents » Resonance
Question
The resonant frequency of a circuit is f. If the capacitance is made 4 times the initial values, then the resonance frequency will become
Choices
Choice (4)  Response  

a.  f  
b. 
 
c.  174  
d.  Both b. and c. are correct 
Question number: 4
» Electromagnetic Induction & Alternating Currents » Resonance
Question
A 10 ohm resistance, 5 mH inductance coil and 10 µF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency
Choices
Choice (4)  Response  

a.  is halved  
b.  is quadrupled  
c.  remains unchanged  
d.  is doubled 
Question number: 5
» Electromagnetic Induction & Alternating Currents » Resonance
Question
The power factor of LCR circuit at resonance is
Choices
Choice (4)  Response  

a.  1  
b.  0.707  
c.  0.5  
d.  Zero 
Question number: 6
» Electromagnetic Induction & Alternating Currents » Resonance
Question
The phase difference between the current and voltage of LCR circuit in series combination at resonance is
Choices
Choice (4)  Response  

a.  0°  
b.  π  
c.  π  
d. 
