Alternating Current questions
577 published questions with worked solutions.
- A step-up transformer operates on a 230 V line and supplies a current of 2 A. The ratio of primary and secondary windings is 1:...
- A step-down transformer reduces the voltage of a transmission line from 2200 V to 220 V. The power delivered by it is 880 W and...
- A current of 5 A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200...
- If a transformer of an audio amplifier has output impedance 8000 and the speaker has input impedance of 8 , the primary and...
- The core of a transformer is laminated because
- If the coils of a transformer are made up of thick wire, then
- The ratio of secondary to primary turns is 4: 5. If power input is P, then the ratio of power output to power input is
- A step-up transformer has 300 turns of primary winding and 450 turns of secondary winding. A primary is connected to 150 V and...
- A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the ratio of output to input...
- An ideal transformer converts 220 V AC to 3.3 kV AC to transmit a power of 4.4 kW. If primary coil has 600 turns, then...
- A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of the...
- A step-down transformer, transforms a supply line voltage of 2200 V into 220 V. The primary coil has 5000 turns. The efficiency...
- Which of the following represents the value of voltage and current at that instant?
- Which current do not change direction with time?
- The maximum value of AC in a circuit is 707 V. Its rms value is
- A resistance of 20 , is connected to a source of an alternating potential, V = 220 (100 t). The time taken by current to change...
- Alternating current cannot be measured by DC ammeter because
- To express AC power in the same form as DC power, a special value of current is defined and used, is called
- The peak value of AC voltage on a 220 V mains is
- The instantaneous voltage through a device of impedance 20 , is V = 80 100 t. The effective value of the current is
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