Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 91 - 94 of 121
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Question number: 91
» Electromagnetic Induction & Alternating Currents » LCR Series Circuit
A series LCR arrangement with X L =80Ω, X C = 50Ω, R = 40Ω is applied across a. c. source of 200 V. Choose the correct options.
(1) Wattless current = 3.2 A
(2) Power current = 3.2 A
(3) Power factor = 0.6
(4) Impedance of circuit = 50 Ω
Select the correct answers and mark it according to the following codes:
1 and 3 are correct
2 and 4 are correct
1, 2 and 3 are correct
1 and 2 are correct
Question number: 92
» Electromagnetic Induction & Alternating Currents » Resonance
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
Question number: 93
» Electromagnetic Induction & Alternating Currents » Power in AC Circuits
For an electric lamp connected in series with a variable capacitor and ac source, its brightness increases with increase in capacitance.
Capacitive reactance decreases with increase in capacitance of capacitor.
|a.||Ꭺ is true but Ꭱ is false|
|b.||Ꭺ is false but Ꭱ is true|
|c.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|d.||Both Ꭺ and Ꭱ are false|
Question number: 94
» Electromagnetic Induction & Alternating Currents » Alternating Currents
An alternating current is more dangerous than the direct steady current.
The frequency of the alternating current is injurious the human body.
|a.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|b.||Ꭺ is true but Ꭱ is false|
|c.||Both Ꭺ and Ꭱ are false|
|d.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|