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Alternating Current

155277 Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

1

R = 20 Ω, L = 1.5 H, C = 35 μ F

2

R = 25 Ω, L = 2.5 H, C = 45 μ F

3

R = 25 Ω, L = 3.5 H, C = 30 μ F

4

R = 25 Ω, L = 1.5 H, C = 45 μ F

Explanation:

C For better tuning of an LCR circuit used for communication the circuit should possess high quality factor of resonance.
$Q = \frac{1}{R} \sqrt{\frac{L}{C}} should be high.$
For it $R$ should be low, $L$ should be high and $C$ should be low.
Therefore, combination in option (c) is correct.

NEET- 2016

Alternating Current

155279 In LCR circuit if resistance increases quality factor

1 increases finitely

2 decreases finitely

3 remains constant

4 none of these

Explanation:

B We know that,
Quality factor $(Q) = \frac{ω_{\circ} L}{R}$
Therefore, resistance $R$ increases then quality factor $Q$ definitely decreases.

DCE-2007

Alternating Current

155105 Find the mismatch pair

1 Induction furnace : eddy current

2 A.C. generator : armature coil

3 LCR circuit armature coil : resonance

4 Transformer resonance : D.C. voltage

5 Magnetic brakes : magnetic flux
magnetic flux

Kerala CEE 04.07.2022

Alternating Current

155115 In an A.C. circuit. the current:

1 always leads the voltage

2 always lags behind the voltage

3 is always in phase with voltage

4 may lead or lags behind or be in phase with voltage

AP EAMCET (Medical)-05.10.2021

Alternating Current

155277 Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

1

R = 20 Ω, L = 1.5 H, C = 35 μ F

2

R = 25 Ω, L = 2.5 H, C = 45 μ F

3

R = 25 Ω, L = 3.5 H, C = 30 μ F

4

R = 25 Ω, L = 1.5 H, C = 45 μ F

Explanation:

C For better tuning of an LCR circuit used for communication the circuit should possess high quality factor of resonance.
$Q = \frac{1}{R} \sqrt{\frac{L}{C}} should be high.$
For it $R$ should be low, $L$ should be high and $C$ should be low.
Therefore, combination in option (c) is correct.

NEET- 2016

Alternating Current

155279 In LCR circuit if resistance increases quality factor

1 increases finitely

2 decreases finitely

3 remains constant

4 none of these

Explanation:

B We know that,
Quality factor $(Q) = \frac{ω_{\circ} L}{R}$
Therefore, resistance $R$ increases then quality factor $Q$ definitely decreases.

DCE-2007

Alternating Current

155105 Find the mismatch pair

1 Induction furnace : eddy current

2 A.C. generator : armature coil

3 LCR circuit armature coil : resonance

4 Transformer resonance : D.C. voltage

5 Magnetic brakes : magnetic flux
magnetic flux

Kerala CEE 04.07.2022

Alternating Current

155115 In an A.C. circuit. the current:

1 always leads the voltage

2 always lags behind the voltage

3 is always in phase with voltage

4 may lead or lags behind or be in phase with voltage

AP EAMCET (Medical)-05.10.2021

Alternating Current

155277 Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

1

R = 20 Ω, L = 1.5 H, C = 35 μ F

2

R = 25 Ω, L = 2.5 H, C = 45 μ F

3

R = 25 Ω, L = 3.5 H, C = 30 μ F

4

R = 25 Ω, L = 1.5 H, C = 45 μ F

Explanation:

C For better tuning of an LCR circuit used for communication the circuit should possess high quality factor of resonance.
$Q = \frac{1}{R} \sqrt{\frac{L}{C}} should be high.$
For it $R$ should be low, $L$ should be high and $C$ should be low.
Therefore, combination in option (c) is correct.

NEET- 2016

Alternating Current

155279 In LCR circuit if resistance increases quality factor

1 increases finitely

2 decreases finitely

3 remains constant

4 none of these

Explanation:

B We know that,
Quality factor $(Q) = \frac{ω_{\circ} L}{R}$
Therefore, resistance $R$ increases then quality factor $Q$ definitely decreases.

DCE-2007

Alternating Current

155105 Find the mismatch pair

1 Induction furnace : eddy current

2 A.C. generator : armature coil

3 LCR circuit armature coil : resonance

4 Transformer resonance : D.C. voltage

5 Magnetic brakes : magnetic flux
magnetic flux

Kerala CEE 04.07.2022

Alternating Current

155115 In an A.C. circuit. the current:

1 always leads the voltage

2 always lags behind the voltage

3 is always in phase with voltage

4 may lead or lags behind or be in phase with voltage

AP EAMCET (Medical)-05.10.2021

Alternating Current

155277 Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

1

R = 20 Ω, L = 1.5 H, C = 35 μ F

2

R = 25 Ω, L = 2.5 H, C = 45 μ F

3

R = 25 Ω, L = 3.5 H, C = 30 μ F

4

R = 25 Ω, L = 1.5 H, C = 45 μ F

Explanation:

C For better tuning of an LCR circuit used for communication the circuit should possess high quality factor of resonance.
$Q = \frac{1}{R} \sqrt{\frac{L}{C}} should be high.$
For it $R$ should be low, $L$ should be high and $C$ should be low.
Therefore, combination in option (c) is correct.

NEET- 2016

Alternating Current

155279 In LCR circuit if resistance increases quality factor

1 increases finitely

2 decreases finitely

3 remains constant

4 none of these

Explanation:

B We know that,
Quality factor $(Q) = \frac{ω_{\circ} L}{R}$
Therefore, resistance $R$ increases then quality factor $Q$ definitely decreases.

DCE-2007

Alternating Current

155105 Find the mismatch pair

1 Induction furnace : eddy current

2 A.C. generator : armature coil

3 LCR circuit armature coil : resonance

4 Transformer resonance : D.C. voltage

5 Magnetic brakes : magnetic flux
magnetic flux

Kerala CEE 04.07.2022

Alternating Current

155115 In an A.C. circuit. the current:

1 always leads the voltage

2 always lags behind the voltage

3 is always in phase with voltage

4 may lead or lags behind or be in phase with voltage

AP EAMCET (Medical)-05.10.2021

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