Test
Chapter 4
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Preguntas del test (25)
1If N1/N2 = 4 and the primary voltage is 120 V, what is the secondary voltage?
- A0 V
- B30 V
- C60 V
- D480 V
2In a step-down transformer, which is larger?
- APrimary voltage
- BSecondary voltage
- CNeither
- DNo answer possible
3A transformer has a turns ratio of 2:1. What is the peak secondary voltage if 115 Vrms is applied to the primary winding?
- A57.5 V
- B81.3 V
- C230 V
- D325 V
4With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?
- A0°
- B90°
- C180°
- D360°
5Suppose 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
- A21 V
- B25 V
- C29.7 V
- D35.4 V
6The voltage out of a bridge rectifier is a
- AHalf-wave signal
- BFull-wave signal
- CBridge-rectified signal
- DSine wave
7If the line voltage is 115 Vrms, a turns ratio of 5:1 means the rms secondary voltage is closest to
- A15 V
- B23 V
- C30 V
- D35 V
8What is the peak load voltage in a full-wave rectifier if the secondary voltage is 20 Vrms?
- A0 V
- B0.7 V
- C14.1 V
- D28.3 V
9We want a peak load voltage of 40 V out of a bridge rectifier. What is the approximate rms value of the secondary voltage?
- A0 V
- B14.4 V
- C28.3 V
- D56.6 V
10With a full-wave rectified voltage across the load resistor, load current flows for what part of a cycle?
- A0°
- B90°
- C180°
- D360°
11What is the peak load voltage out of a bridge rectifier for a secondary voltage of 12.6 Vrms? (Use second approximation.)
- A7.5 V
- B16.4 V
- C17.8 V
- D19.2 V
12If the line frequency is 60 Hz, the output frequency of a half-wave rectifier is
- A30 Hz
- B60 Hz
- C120 Hz
- D240 Hz
13If the line frequency is 60 Hz, the output frequency of a bridge rectifier is
- A30 Hz
- B60 Hz
- C120 Hz
- D240 Hz
14With the same secondary voltage and filter, which has the most ripple?
- AHalf-wave rectifier
- BFull-wave rectifier
- CBridge rectifier
- DImpossible to say
15With the same secondary voltage and filter, which produces the least load voltage?
- AHalf-wave rectifier
- BFull-wave rectifier
- CBridge rectifier
- DImpossible to say
16If the filtered load current is 10 mA, which of the following has a diode current of 10 mA?
- AHalf-wave rectifier
- BFull-wave rectifier
- CBridge rectifier
- DImpossible to say
17If the load current is 5 mA and the filter capacitance is 1000 µF, what is the peak-to-peak ripple out of a bridge rectifier?
- A21.3 pF
- B56.3 nV
- C21.3 mV
- D41.7 mV
18The diodes in a bridge rectifier each have a maximum dc current rating of 2 A. This means the dc load current can have a maximum value of
- A1 A
- B2 A
- C4 A
- D8 A
19What is the PIV across each diode of a bridge rectifier with a secondary voltage of 20 Vrms?
- A14.1 V
- B20 V
- C28.3 V
- D34 V
20If the secondary voltage increases in a bridge rectifier with a capacitor-input filter, the load voltage will
- ADecrease
- BStay the same
- CIncrease
- DNone of these
21If the filter capacitance is increased, the ripple will
- ADecrease
- BStay the same
- CIncrease
- DNone of these
22A circuit that removes positive or negative parts of a waveform is called a
- AClamper
- BClipper
- CDiode clamp
- DLimiter
23A circuit that adds a positive or negative dc voltage to an input sine wave is called a
- AClamper
- BClipper
- CDiode clamp
- DLimiter
24For a clamper circuit to operate properly, its RLC time constant should be
- AEqual to the period T of the signal
- B> 10 times the period T of the signal
- C>100 times the period T of the signal
- D< 10 times the period T of the signal
25Voltage multipliers are circuits best used to produce
- ALow voltage and low current
- BLow voltage and high current
- CHigh voltage and low current
- DHigh voltage and High current
Información
- Descripción
- Nuclear Program Test sobre Chapter 4 , creado por Katrina Himes el 22/04/2018.
- Autor
- Katrina Himes
- Idioma
- English
- Visitas
- 36
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test