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PHXII07:ALTERNATING CURRENT

356063 In case of $A C$ circuits the relation $V = i Z$ , where $Z$ is impedance, can directly applied to

1 Peak values of voltage and current only

2 Rms values of voltage and current only

3 Instantaneous values of voltage and current only

4 Both 1 and 2 are true

PHXII07:ALTERNATING CURRENT

356064 The AC voltage across a resistance can be measured using a:

1 Hot wire voltmeter

2 Moving coil galvanometer

3 Potential coil galvanometer

4 Moving magnet galvanometer

Explanation:

Hot wire voltmeter is used to measure $A C$ voltage.

JEE - 2015

PHXII07:ALTERNATING CURRENT

356065 In an $a c$ circuit the current

1 Is in phase with the voltage

2 Leads the voltage

3 Lags the voltage

4 Any of the above depending on the circumstances

PHXII07:ALTERNATING CURRENT

356066 Alternating current can not be measured by $d c$ ammeter because

1

a c

is virtual

2

a c

cannot pass through

d c

ammeter

3 Average value of current is zero

4

a c

changes its direction

Explanation:

In $d c$ ammter, a coil is free to rotate in the magnetic field of a fixed magnet. If an alternating current is passed through such a coil, the torque will reverse its direction each time the current changes direction and the average value of the torque will be zero.

PHXII07:ALTERNATING CURRENT

356063 In case of $A C$ circuits the relation $V = i Z$ , where $Z$ is impedance, can directly applied to

1 Peak values of voltage and current only

2 Rms values of voltage and current only

3 Instantaneous values of voltage and current only

4 Both 1 and 2 are true

PHXII07:ALTERNATING CURRENT

356064 The AC voltage across a resistance can be measured using a:

1 Hot wire voltmeter

2 Moving coil galvanometer

3 Potential coil galvanometer

4 Moving magnet galvanometer

Explanation:

Hot wire voltmeter is used to measure $A C$ voltage.

JEE - 2015

PHXII07:ALTERNATING CURRENT

356065 In an $a c$ circuit the current

1 Is in phase with the voltage

2 Leads the voltage

3 Lags the voltage

4 Any of the above depending on the circumstances

PHXII07:ALTERNATING CURRENT

356066 Alternating current can not be measured by $d c$ ammeter because

1

a c

is virtual

2

a c

cannot pass through

d c

ammeter

3 Average value of current is zero

4

a c

changes its direction

Explanation:

In $d c$ ammter, a coil is free to rotate in the magnetic field of a fixed magnet. If an alternating current is passed through such a coil, the torque will reverse its direction each time the current changes direction and the average value of the torque will be zero.

PHXII07:ALTERNATING CURRENT

356063 In case of $A C$ circuits the relation $V = i Z$ , where $Z$ is impedance, can directly applied to

1 Peak values of voltage and current only

2 Rms values of voltage and current only

3 Instantaneous values of voltage and current only

4 Both 1 and 2 are true

PHXII07:ALTERNATING CURRENT

356064 The AC voltage across a resistance can be measured using a:

1 Hot wire voltmeter

2 Moving coil galvanometer

3 Potential coil galvanometer

4 Moving magnet galvanometer

Explanation:

Hot wire voltmeter is used to measure $A C$ voltage.

JEE - 2015

PHXII07:ALTERNATING CURRENT

356065 In an $a c$ circuit the current

1 Is in phase with the voltage

2 Leads the voltage

3 Lags the voltage

4 Any of the above depending on the circumstances

PHXII07:ALTERNATING CURRENT

356066 Alternating current can not be measured by $d c$ ammeter because

1

a c

is virtual

2

a c

cannot pass through

d c

ammeter

3 Average value of current is zero

4

a c

changes its direction

Explanation:

In $d c$ ammter, a coil is free to rotate in the magnetic field of a fixed magnet. If an alternating current is passed through such a coil, the torque will reverse its direction each time the current changes direction and the average value of the torque will be zero.

PHXII07:ALTERNATING CURRENT

356063 In case of $A C$ circuits the relation $V = i Z$ , where $Z$ is impedance, can directly applied to

1 Peak values of voltage and current only

2 Rms values of voltage and current only

3 Instantaneous values of voltage and current only

4 Both 1 and 2 are true

PHXII07:ALTERNATING CURRENT

356064 The AC voltage across a resistance can be measured using a:

1 Hot wire voltmeter

2 Moving coil galvanometer

3 Potential coil galvanometer

4 Moving magnet galvanometer

Explanation:

Hot wire voltmeter is used to measure $A C$ voltage.

JEE - 2015

PHXII07:ALTERNATING CURRENT

356065 In an $a c$ circuit the current

1 Is in phase with the voltage

2 Leads the voltage

3 Lags the voltage

4 Any of the above depending on the circumstances

PHXII07:ALTERNATING CURRENT

356066 Alternating current can not be measured by $d c$ ammeter because

1

a c

is virtual

2

a c

cannot pass through

d c

ammeter

3 Average value of current is zero

4

a c

changes its direction

Explanation:

In $d c$ ammter, a coil is free to rotate in the magnetic field of a fixed magnet. If an alternating current is passed through such a coil, the torque will reverse its direction each time the current changes direction and the average value of the torque will be zero.