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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
$$\frac{{44}}{\pi }$$
Correct Answer:
$$\frac{{44}}{\pi }$$
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
In a centre tapped full wave rectifier, RL=1KΩ and for diode Rf=10Ω. The primary voltage is 800sinωt with transformer turns ratio=2. The ripple factor will be _________
A
54%
B
48%
C
26%
D
81%
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
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
A half wave rectifier, operated from a 50Hz supply uses a 1000µF capacitance connected in parallel to the load of rectifier. What will be the minimum value of load resistance that can be connected across the capacitor if the ripple% not exceeds 5?
A
114.87Ω
B
167.98Ω
C
115.47Ω
D
451.35Ω
In a center tapped full wave rectifier, the input sine wave is 200sin50 ᴨt. If load resistance is of 1k then average DC power output of half wave rectifier is __________
A
12.56W
B
16.20W
C
4.02W
D
8.04W
If the peak voltage on a centre tapped full wave rectifier circuit is 5V and diode cut in voltage is 0.7. The peak inverse voltage on diode is_________
A
4.3V
B
9.3V
C
5.7V
D
10.7V
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
For the same secondary voltage, the output voltage from a centre-tap rectifier is ___________ than that of bridge rectifier
A
twice
B
thrice
C
four time
D
one-half
A transformer coupled class A power amplifier has a load of 100 Ω on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
A
5 kΩ
B
20 kΩ
C
100 kΩ
D
10 kΩ