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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
Correct Answer:
0.2 A
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 ratio of 5 is fed from a 3-phase 1100 V source. The secondary of this transformer is connected through a 3-pulse type rectifier, which is feeding an R load. The power delivered to the load is 6839.3 Watts. The maximum value of the load current is √2 x 22 A. Fin, the rms value of output voltage Vo (rms)
A
257.3 V
B
220 V
C
261.52 V
D
248.32 V
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
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
A man starts from point 'O', travels 20 km towards east to reach point 'A', turns right and travels 10 km to reach point 'B', turns right and travels 9 km to reach point 'C', turns right and travels 5 km to reach point 'D', turns left and travels 12 km to reach point 'E' and then turns right and travels 6 km to reach point 'F'. What is the shortest distance between point 'E' and point 'C'?
A
13
B
\u221a2
C
\u221a20
D
\u221a145
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
In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is
A
6 A
B
424 mA
C
4.24 A
D
42.4 A
A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?
A
700 V
B
707 V
C
651 V
D
208 V
E
None of the above