Question

1. A 230/110 V single-phase transformer has a core loss of 100 W. If the input under no-load condition is 400 VA, find core loss current, magnetising current and no-load power factor angle. 2. A single phase, 50 kVA, 2300/230 V, 50 Hz transformer is connected to 230 V supply on the secondary side, the primary being open. The meter indicate the following readings: Power = 230 watt Voltage = 230 V Current = 6.5 A Find (i) Core loss: (ii) loss component of the current; (iii) magnetising current. Draw the phasor diagram for this condition. 3. A 230V, 50 Hz transformer has 200 primary turns. It draws 5 A at 0.25 p.f lagging at no-load. Determine: (i) Maximum value of flux in the core; (ii) Core loss; (iii) Magnetising current (iv) Exciting resistance and reactance of the transformer. Also draw its equivalent circuit.

          1. A 230/110 V single-phase transformer has a core loss of 100 W. If the input under
no-load condition is 400 VA, find core loss current, magnetising current and no-load
power factor angle.
2. A single phase, 50 kVA, 2300/230 V, 50 Hz transformer is connected to 230 V supply
on the secondary side, the primary being open. The meter indicate the following
readings:
Power = 230 watt
Voltage = 230 V
Current = 6.5 A
Find (i) Core loss: (ii) loss component of the current; (iii) magnetising current. Draw
the phasor diagram for this condition.
3. A 230V, 50 Hz transformer has 200 primary turns. It draws 5 A at 0.25 p.f lagging at
no-load.
Determine:
(i) Maximum value of flux in the core; (ii) Core loss; (iii) Magnetising current (iv)
Exciting resistance and reactance of the transformer. Also draw its equivalent circuit.

1. A 230/110 V single-phase transformer has a core loss of 100 W. If the input under
no-load condition is 400 VA, find core loss current, magnetising current and no-load
power factor angle.
2. A single phase, 50 kVA, 2300/230 V, 50 Hz transformer is connected to 230 V supply
on the secondary side, the primary being open. The meter indicate the following
readings:
Power = 230 watt
Voltage = 230 V
Current = 6.5 A
Find (i) Core loss: (ii) loss component of the current; (iii) magnetising current. Draw
the phasor diagram for this condition.
3. A 230V, 50 Hz transformer has 200 primary turns. It draws 5 A at 0.25 p.f lagging at
no-load.
Determine:
(i) Maximum value of flux in the core; (ii) Core loss; (iii) Magnetising current (iv)
Exciting resistance and reactance of the transformer. Also draw its equivalent circuit.

Added by Janice C.

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