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A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?
A
12 V
B
18 V
C
24 V
D
30 V
E
None of the above
Correct Answer:
24 V
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
A step-down delta-star transformer, with per-phase turns ration of 5, is fed from a 3-phase, 1100 V, 50 Hz source. The secondary of this transformer through a 3-pulse type rectifier feeds a R load of 10 Ω. Find the maximum value of the load current (phase).
A
√2 x 22 A
B
1 x 11 A
C
√2 x 11 A
D
1 x 22 A
Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?
A
0.3 A
B
0.2 A
C
0.4 A
D
0.6 A
E
None of the above
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
For a transformer with primary turns 100, secondary turns 400, if 200 V is applied at primary we will get ___________
A
3200 V at secondary
B
1600 V at secondary
C
800 V at secondary
D
80 V at secondary
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
Sundar runs 20 m towards East and turns to right and runs 10 m. Then he turns to the right and runs 9 m. Again he turns to right and runs 5 m. After this he turns to left and runs 12 m and finally he turns to right and 6 m. Now to which direction is Sundar facing?
A
East
B
West
C
North
D
South
Arun and Amit started walking from two different points 'A' and 'B' respectively.Arun walks 2 kms North and turns to the East and walks 3 kms and again turns to North walks 4 kms and finally turns to East and Walks 5kms to reach point 'C'. Similarly, Amit walks 2 kms North and turns to west and walks 3 kms and finally turns to North, walks 4 kms and meets Arun at point 'C'. What is the distance between Arun and Amit's starting points?
A
5 km
B
8 km
C
11 km
D
13 km
A boy runs 20 m towards East and turns to right, runs 10 m and turns to right, runs 9 m and again turns to left, runs 5 m and turns to left, runs 12 m andfinally turns to left and runs 6m. Now, which direction is the boy facing?
A
East
B
West
C
North
D
South