Alternating Current questions
577 published questions with worked solutions.
- A circuit has a resistance of 12Ω and an impedance of 15Ω. The power factor of the circuit will be
- The phase difference between the alternating current and emf is /2. Which of the following cannot be the constituent of the...
- In a series resonant LCR circuit, the voltage across R is 100 volts and R = 1k with C = 2 F. The resonant frequency is 200rad/s....
- In a series LCR circuit R = 200Ω and the voltage and the frequency of the main supply is 220 V and 50 Hz respectively. On taking...
- D.C. ammeter is connected in a circuit through which A.C. of 50 HZ flows. The ammeter would read:
- A transformer is employed to
- What increased in step-down transformer
- a device which converts low ac voltage at high current into high ac voltage at low current is
- The transformation ration in the step-up transformer is
- In a transformer 220 ac voltage is increased to 2200 volts. Of the number of turns in the secondary are 200, then the number of...
- the ratio of secondary to the primary turns in a transformer is 3:2 if the power output be p, the input power neglecting all...
- A loss free transformer has 500 turns on its primary winding and 2500 in secondary the meters of the secondary indicate 200 volts...
- an ideal transformer has 100 turns in the primary and 250 turns in the secondary the peak value of the ac is 28V the r.m.s...
- A power transformer is used to step up an alternating e.m.f. of 220 V to 11 kV to transmit 4.4 kw of power. If the primary coil...
- in a step-up transformer the voltage in the primary is 220 V and the current is 5A the secondary voltage is found to be 22000V...
- A transformer with efficiency 80% works at 4 kW and 100 V. if the secondary voltage is 200 V, then the primary and secondary...
- A step-down transformer is used on a 1000 V line to deliver 20 A at 120V the secondary coil. If the efficiency of the transformer...
- In a step up transformer, if the voltage in the secondary is increased, then the current in the primary is
- The basic requirement for the operation of a transformer is that its input voltage must be
- The primary and secondary voltage of an ideal step down transformer is 200 V and 25 V respectively.The secondary is connected to...
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