ECE21M06L01Q1

If N1/N2 = 4 and the primary voltage is 120 V, what is the secondary voltage?

• 0 V
• 30 V
• 60 V
• 480 V

In a step-down transformer, which is larger?

• Primary voltage
• Secondary voltage
• Neither
• No answer possible

A transformer has a turns ratio of 2:1. What is the peak secondary voltage if 115 Vrms is applied to the primary winding?

• 57.5 V

• 81.3 V

• 230 V

• 325 V

With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?

• 0°
• 90°
• 180°
• 360°

Suppose line voltage may be as low as 105 Vrms or as high as 125 Vrms in a half-wave rectifier. With a 5:1 step-down transformer, the minimum peak load voltage is closest to

• 21 V
• 25 V
• 29.7 V
• 35.4 V

The voltage out of a bridge rectifier is a

• Half-wave signal
• Full-wave signal
• Bridge-rectified signal
• Sine wave

If the line voltage is 115 Vrms, a turns ratio of 5:1 means the rms secondary voltage is closest to

• 15 V
• 23 V
• 30 V
• 35 V

What is the peak load voltage in a full-wave rectifier if the secondary voltage is 20 Vrms?

• 0 V
• 0.7 V
• 14.1 V
• 28.3 V

We want a peak load voltage of 40 V out of a bridge rectifier. What is the approximate rms value of the secondary voltage?

• 0 V
• 14.4 V
• 28.3 V
• 56.6 V

With a full-wave rectified voltage across the load resistor, load current flows for what part of a cycle?

• 0°
• 90°
• 180°
• 360°