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What value of series resistance is required when three 10-watt, 10-volt, 1000 mA Zener diodes are connected in series to obtain a 30-volt regulated output from a 45 volt d.c. power source ?
Date posted:
August 14, 2019
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The circuit of Fig. 3.66 uses two Zener diodes, each rated at 15 V, 200 mA. If the circuit is connected to a 45-volt unregulated supply, determine:
(i) The regulated output voltage
(ii) The value of series resistance R
Date posted:
August 14, 2019
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A 10-V Zener diode is used to regulate the voltage across a variable load resistor [See fig. 3.65]. The input voltage varies between 13 V and 16 V and the load current varies between 10 mA and 85 mA. The minimum Zener current is 15 mA. Calculate the value of series resistance R.
Date posted:
August 14, 2019
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The Zener diode shown in Fig. 3.64 has VZ = 18 V. The voltage across the load stays at 18 V as long as IZ is maintained between 200 mA and 2 A. Find the value of series resistance R so that E0 remains 18 V while input voltage Ei is free to vary between 22 V to 28V.
Date posted:
August 14, 2019
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A 7.2 V Zener is used in the circuit shown in Fig. 3.63 and the load current is to vary from 12 to 100 mA. Find the value of series resistance R to maintain a voltage of 7.2 V across the load. The input voltage is constant at 12V and the minimum Zener current is 10 mA.
Date posted:
August 14, 2019
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For the circuit shown in Fig. 3.62 (i), find the maximum and minimum values of Zener diode current.
Date posted:
August 14, 2019
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For the circuit shown in Fig. 3.61 (i), find:
(i) the output voltage
(ii) the voltage drop across series resistance
(iii) the current through Zener diode.
Date posted:
August 14, 2019
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Explain Zener Diode as Voltage Stabilizer
Date posted:
August 14, 2019
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What is a Zener Diode?
Date posted:
August 14, 2019
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Define the following terms:
(i) Forward current
(ii) Peak inverse voltage
(iii) Reverse current or leakage current
Date posted:
August 14, 2019
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Determine the state of diode for the circuit shown in Fig. 3.18 (i) and find ID and VD. Assume simplified model for the diode.
Date posted:
August 14, 2019
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Determine if the diode (ideal) in Fig. 3.17 (i) is forward biased or reverse biased.
Date posted:
August 14, 2019
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Determine the currents I1, I2 and I3 for the network shown in Fig. 3.16(i). Use simplified model for the diodes.
Date posted:
August 14, 2019
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Determine current through each diode in the circuit shown in Fig. 3.15 (i). Use simplified model. Assume diodes to be similar.
Date posted:
August 14, 2019
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Find VQ and ID in the network shown in Fig. 3.14 (i). Use simplified model
Date posted:
August 14, 2019
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Find the voltage VA in the circuit shown in Fig. 3.13 (i). Use simplified model.
Date posted:
August 14, 2019
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Determine the current I in the circuit shown in Fig. 3.12
(i). Assume the diodes to be of silicon and forward resistance of diodes to be zero.
Date posted:
August 14, 2019
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Calculate the current through 48 Ω resistor in the circuit shown in Fig. below
(i). Assume the diodes to be of silicon and forward resistance of each diode is 1 Ω.
Date posted:
August 14, 2019
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Find the current through the diode in the circuit shown in Fig. 3.10
(i). Assume the diode to be ideal.
Date posted:
August 14, 2019
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An a.c. voltage of peak value 20 V is connected in series with a silicon diode and load resistance of 500 Ω. If the forward resistance of diode is 10 Ω, find:
(i) peak current through diode
(ii) peak output voltage. What will be these values if the diode is assumed to be ideal ?
Date posted:
August 14, 2019
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What is the Equivalent Circuit of Crystal Diode?
Date posted:
August 14, 2019
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Discuss on Resistance of Crystal Diode
Date posted:
August 14, 2019
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In each diode circuit of Fig. 3.4, find whether the diodes are forward or reverse biased.
Date posted:
August 14, 2019
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How is a Crystal Diode a Rectifier?
Date posted:
August 14, 2019
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What is a Semiconductor Diode?
Date posted:
August 14, 2019
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Discuss the Limitations in the Operating Conditions of pn Junction
Date posted:
August 14, 2019
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Explain the following terms as used in electronics
1. Breakdown voltage
2. Knee voltage
Date posted:
August 14, 2019
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What are the Volt-Ampere Characteristics of pn Junction?
Date posted:
August 14, 2019
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Explain the Current Flow in a Forward Biased pn Junction
Date posted:
August 14, 2019
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Discuss the Properties of PN Junction
Date posted:
August 14, 2019