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# Test: AC Applied to LCR in Series

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## 10 Questions MCQ Test Physics Class 12 | Test: AC Applied to LCR in Series

Test: AC Applied to LCR in Series for NEET 2023 is part of Physics Class 12 preparation. The Test: AC Applied to LCR in Series questions and answers have been prepared according to the NEET exam syllabus.The Test: AC Applied to LCR in Series MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: AC Applied to LCR in Series below.
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Test: AC Applied to LCR in Series - Question 1

### In a capacitance dominated RLC circuit

Detailed Solution for Test: AC Applied to LCR in Series - Question 1

In a series RLC circuit there becomes a frequency point were the inductive reactance of the inductor becomes equal in value to the capacitive reactance of the capacitor. In other words, XL = XC.
Series Resonance circuits are one of the most important circuits used electrical and electronic circuits.

Test: AC Applied to LCR in Series - Question 2

### In an RLC circuit, which of the following is always used as a vector reference?

Detailed Solution for Test: AC Applied to LCR in Series - Question 2

In an RLC circuit, the voltage is always used as a reference and according to the phase of the voltage, the phase of the other parameters is decided.

Test: AC Applied to LCR in Series - Question 3

### A 1.0 mH inductance, a10μF capacitance and a 5.0 ohm resistance are connected series to an a.c. source. It is found that inductor and the capacitor show equal reactance. The reactance should be nearest to:​

Detailed Solution for Test: AC Applied to LCR in Series - Question 3

From the formula we get,
XL=XC
ωL=1/ωC
⇒ω2=1/LC
⇒ω=1/√Lc
⇒ω=1/√10-3x10-5
⇒ω=104
We also know that,
XL=ωL
⇒XL=104x10-3
⇒XL=10 Ω
Therefore,XL=XC=10Ω

Test: AC Applied to LCR in Series - Question 4

In which of the following cases the power factor is not equal to 1​

Test: AC Applied to LCR in Series - Question 5

What is the inductance of a choke required for a lamp running at 60 volt d.c consuming 5 A current connected to 110 volt, 50 Hz ac mains?

Test: AC Applied to LCR in Series - Question 6

Ac and dc both can be measured by

Detailed Solution for Test: AC Applied to LCR in Series - Question 6

Hotwire instruments are based on the heat Irms2​Rt and/or power Irms2​R producing property of current. Hence it can measure both ac and dc current as both produce heat when passed through a conductor.

Test: AC Applied to LCR in Series - Question 7

What is the value of power factor in RLC circuit

Test: AC Applied to LCR in Series - Question 8

In a series LCR what will be phase difference between voltage drop across inductor and capacitor

Detailed Solution for Test: AC Applied to LCR in Series - Question 8

Let’s keep this simple and to the point. We know that:
1.in a series circuit the same current flows through each component
2.the voltage across an ideal inductor L is 90˚ ahead of an AC current through it
3.the voltage across an ideal capacitor C is 90˚ behind an AC current through it
So putting these facts together we can conclude that given an AC series current the voltages across any L and C must have a phase difference of 180˚

Test: AC Applied to LCR in Series - Question 9

A resistance of 5 ohm and an inductance of 50 mH are connected in series with an a. c. I = 100 sin (100 t). What is the phase difference between the instantaneous current and voltage?​

Detailed Solution for Test: AC Applied to LCR in Series - Question 9

Cosφ=R/Z=R/√R2/ ω2L2=5/√(25+(50)2x (0.1)2)
=5/√(25+25)=1/√2
⇒φ=π/4

Test: AC Applied to LCR in Series - Question 10

Detailed Solution for Test: AC Applied to LCR in Series - Question 10

In electrical engineering, admittance is a measure of how easily a circuit or device will allow a current to flow. It is defined as the reciprocal of impedance, analogous to how conductance & resistance are defined. The SI unit of admittance is the siemens (symbol S); the older, synonymous unit is mho, and its symbol is ℧ (an upside-down uppercase omega Ω). Oliver Heaviside coined the term admittance in December 1887.
Y=1/Z
where
Y is the admittance, measured in siemens
Z is the impedance, measured in ohms

## Physics Class 12

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## Physics Class 12

157 videos|452 docs|213 tests

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