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The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:
A
One-half the primary current
B
Same as the primary current
C
Twice the primary current
D
No more than 10% less than the primary current
E
None of the above
Correct Answer:
One-half the primary current
A 25 KVA transformer is constructed to a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms and of secondary winding is 0.5+j0.8 ohms. What will be the impedance of transformer when referred to primary?
A
53 + 85j ohms
B
53j + 85 ohms
C
Can’t be calculated
D
3.5 + 5.8j ohms
A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?
A
4.73
B
0.4 V
C
24 V
D
600 V
E
None of the above
A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding?
A
50 A
B
12:00 AM
C
5:00 AM
D
20 A
E
None of the above
I1 is the current flowing in the first mesh. I2 is the current flowing in the second mesh and I3 is the current flowing in the top mesh. If all three currents are flowing in the clockwise direction, find the value of I1, I2 and I3.
A
7.67A, 10.67A, 2A
B
10.67A, 7.67A, 2A
C
7.67A, 8.67A, 2A
D
3.67A, 6.67A, 2A
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
A
7.8 mA
B
208 mA
C
200 mA
D
300 mA
E
None of the above
What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?
A
01-Apr
B
01-Mar
C
2
D
3
E
None of the above
An AC voltage of 220 V(rms) is applied to the primary of a 10 : 1 step-down transformer. The secondary of the transformer is centre tapped and connected to a full-wave rectifier with a load resistance. The DC voltage appearing the load is
A
$$\frac{{22}}{\pi }$$
B
$$\frac{{31}}{\pi }$$
C
$$\frac{{62}}{\pi }$$
D
$$\frac{{44}}{\pi }$$
A 10 KVA, 2000/200 V, single phase transformer operating at 50 Hz with a current of 50 A flowing through the l.v. winding. Then the Self inductance of l.v. winding is?
A
12.7mH
B
1.27 mH
C
12.7H
D
0.127 H
In a cricket season, Bangladesh defeated Australia twice, West Indies defeated Bangladesh twice, Australia defeated West Indies twice , Bangladesh defeated New Zealand twice, West Indies defeated New Zealand twice. Which country has lost most number of times ?
A
Bangladesh
B
Australia
C
New Zealand
D
West Indies
For a transformer with primary turns 400, secondary turns 100, if 20A current is flowing through primary, we will get ___________
A
800A at secondary
B
40A at secondary
C
80A at secondary
D
5A at secondary