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The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 Ω load. The turns ratio is 3:1. What is the secondary voltage?
A
2 V
B
20 V
C
180 V
D
18 V
Correct Answer:
20 V
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 ratio of 5 is fed from a 3-phase 1100 V, 50 Hz source. The secondary of this transformer is connected through a 3-pulse type rectifier, which is feeding feeding an R load. Find the average value of output voltage.
A
220 V
B
257 V
C
1100/√3 V
D
206 V
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 transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is
A
1.3 Ω
B
7.8 Ω
C
78 Ω
D
13 Ω
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
A large circular coil of N turns and radius R carries a time varying current $$I = {I_0}\sin \left( {\omega t} \right).$$ A small circular coil of n turns and radius r(r ≪ R) is placed at the centre of the large coil such that the coils are concentric and coplanar. The induced emf in the small coil
A
leads the current in the large coil by $$\frac{\pi }{2}$$
B
lags the current in the large coil by $$\pi $$
C
is in phase with the current in the large coil
D
lags the current in the large coil by $$\frac{\pi }{2}$$
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 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is
A
3 V
B
6 V
C
4 V
D
0 V
If source resistance in an amplifier circuit is zero, then voltage gain (output to input voltage ratio) and source voltage gain (output to source voltage ratio) are the same.
A
True
B
False
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