Half Wave Rectifier

Q. In half-wave rectification, what is the output frequency if the input frequency is 50 Hz. What is the output frequency of a full-wave rectifier for the same input frequency.

Q.

How does a BJT act as a switch?

Q. The power gain of a common emitter amplifier of voltage gain 50 and input impedance 100 ohm is 1250. Find its output impedance

Q. The peak voltage in the output of a half-wave dioderectifier fed with a sinusoidal signal without filter is10 V The D.C. component of the output voltage is

Q.

What is a current amplifier?

Q.

What are the advantages of the differential amplifier?

Q.

The maximum efficiency of full-wave rectifier is

1. $100\%$

2. $25.20\%$

3. $42.2\%$

4. $81.2\%$

Q.

The transfer characteristics of a base biased transistor has the operation regions namely, cut off, active region and saturation region. For using the transistor as an amplifier it has to operate in the region:

1. Active

2. Cut off

3. Saturation

4. Cut off and saturation

Q.

In a common-base amplifier, the phase difference between the input signal voltage and the output voltage is

1. $\frac{\mathrm{\pi }}{2}$

2. $\frac{\mathrm{\pi }}{4}$

3. Zero

4. $\mathrm{\pi }$

Q.

Figure 7.21 shows a series LCR circuit connected to a variable frequency 230 V source. L = 5.0 H, C = 80μF, R = 40 Ω

(a) Determine the source frequency which drives the circuit in resonance.

(b) Obtain the impedance of the circuit and the amplitude of current at the resonating frequency.

(c) Determine the rms potential drops across the three elements of the circuit. Show that the potential drop across the LC combination is zero at the resonating frequency.

Q. In the half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be

1. 25 Hz
2. 50 Hz
3. 70.7 Hz
4. 100 Hz

Q. A sinusoidal voltage of peak value $200\text{V}$ is connected to a diode and resistor $R$ in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to $R$, the rms value of voltage across $R$ in volts is approximately

1. $100$
2. $100\sqrt{2}$
3. $283$
4. $200$

Q. The average value of output direct current in a half wave rectifier is

1. I₀ / π
2. I₀ / 2
3. πI₀ / 2
4. 2 I₀ / π

Q. In the half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be

1. 25 Hz
2. 50 Hz
3. 70.7 Hz
4. 100 Hz

Q.

A series LCR circuit with L = 0.12 H, C = 480 nF, R = 23 Ω is connected to a 230 V variable frequency supply.

(a) What is the source frequency for which current amplitude is maximum. Obtain this maximum value.

(b) What is the source frequency for which average power absorbed by the circuit is maximum. Obtain the value of this maximum power.

(c) For which frequencies of the source is the power transferred to the circuit half the power at resonant frequency? What is the current amplitude at these frequencies?

(d) What is the Q-factor of the given circuit?

Q.

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Q. For the given circuit shown in the diagram, to act as full wave rectifier, A.C. input should be connected across ....... and ....... while the D.C. output would appear across ....... and .......

1. A, C and B, D
2. B, D and A, C
3. A, B and C, D
4. C, A and D, B

Q. A sinusoidal voltage of amplitude 25V and frequency 50Hz is applied to half-wave rectifier using P-N junction diode. No filter is used and the load resistor is 1000 Ohm. The forward resistance Rf of ideal diode is 10 ohm. What is the percentage rectifier efficiency?

Q. The phase difference between current and voltage in an AC circuit is /4 radian. Of the frequency of AC is 50Hz then the phase difference is equivalent to the Time difference of 1) 0.75s 2) 10.5ms 3) 2.5ms

Q. A sinusoidal voltage of peak value $200\text{V}$ is connected to a diode and resistor $R$ in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to $R$, the rms value of voltage across $R$ in volts is approximately

1. $200$
2. $100$
3. $100\sqrt{2}$
4. $283$

Q. In an RLC circuit at resonance power factor is
A. 0.5
B. -0.5
C. 1
D. 0

Q. Why do we say transistor transfers resistance

Q. for a value of ω for which the current amplitude is 1/\sqrt2 times its maximum value .At this value the power dissipiated in the circuit becomes half .prove it

Q.

An RLC circuit is driven by a sinusoidal emf with angular frequency $\omega$. If the angular frequency is increased without changing the amplitude of the emf, the current amplitude increases, it means?

1. $\omega L>\frac{1}{\omega C}$

2. $\omega L<\frac{1}{\omega C}$

3. $\omega L=\frac{1}{\omega C}$

4. None of the options

Q.

The PN junction diode is used as

1. An oscillator

2. An amplifier

3. A modulator

4. A rectifier

Q. What does generally the load resistance signify in half wave rectifier circuit diagram?

Q.

Transistor cannot be used as a

Q. $p-n\text{junction}$ diodes are commonly used for rectification of alternating voltages. Then, which amongst the following properties of diode is responsible for this?

1. Forward biased resistance is very low compared to reverse biased.
2. Both options $\left(A\right)$ and $\left(B\right)$
3. Current flow in one direction.
4. Reverse current is independent of voltage applied.

Q.

A square wave current, switching rapidly between $+0.5A$ and $-0.5A$, is passed through an AC ammeter. The reading shown by ammeter is.

Q. If the voltage of a source in an AC circuit is represented by the equation, $E=220\sqrt{2}\sin \left(314t\right)$. The frequency of the voltage is -

Take $\pi =3.14$

1. $100\text{Hz}$
2. $50\text{Hz}$
3. $200\text{Hz}$
4. $150\text{Hz}$