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In connection with the circuit drawn below, the value of current flowing through 2 kΩ resistor is ×10-4 A.
In connection with the circuit drawn below, the value of current flowing through 2 kΩ resistor is ×10-4 A.
25
A common transistor radio set requires 12V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are
A common transistor radio set requires 12V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are
440
Match List I with List II.
Match List I with List II.
Rectifier = Used either for stepping up or stepping down the a.c. voltage Stabilizer = Used to convert a.c. voltage into d.c. voltage Transformer = Used to remove any ripple in the rectified output voltage Filter = Used for constant output voltage even when the input voltage or load current change
The circuit contains two diodes each with a forward resistance of 50 Ω and with infinite reverse resistance. If the battery voltage is 6 V, the current through the 120 Ω resistance is _ mA.
The circuit contains two diodes each with a forward resistance of 50 Ω and with infinite reverse resistance. If the battery voltage is 6 V, the current through the 120 Ω resistance is _ mA.
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The value of power dissipated across the zener diode (Vz = 15 V) connected in the circuit as shown in the figure is x × 10-1 watt. The value of x, to the nearest integer, is
The value of power dissipated across the zener diode (Vz = 15 V) connected in the circuit as shown in the figure is x × 10-1 watt. The value of x, to the nearest integer, is
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Statement-I : By doping silicon semiconductor with pentavalent material, the electrons density increases.
Statement-I : By doping silicon semiconductor with pentavalent material, the electrons density increases.
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Statement-II: The n-type semiconductor has net negative charge.
Statement-II: The n-type semiconductor has net negative charge.
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A transistor is connected in common emitter circuit configuration, the collector supply voltage is 10 V and the voltage drop across a resistor of 1000 Ω in the collector circuit is 0.6 V. If the current gain factor (β) is 24, then the base current is _ μA. (Round off to the Nearest Integer)
A transistor is connected in common emitter circuit configuration, the collector supply voltage is 10 V and the voltage drop across a resistor of 1000 Ω in the collector circuit is 0.6 V. If the current gain factor (β) is 24, then the base current is _ μA. (Round off to the Nearest Integer)
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A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance Rp is ...........Ω.
A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance Rp is ...........Ω.
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For the forward biased diode characteristics shown in the figure, the dynamic resistance at ID = 3 mA will be _ Ω.
For the forward biased diode characteristics shown in the figure, the dynamic resistance at ID = 3 mA will be _ Ω.
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In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. The minimum value of the resistance required, if the maximum zener current is 90 mA will be _ Ω.
In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. The minimum value of the resistance required, if the maximum zener current is 90 mA will be _ Ω.
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Statement-I : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect a capacitor across the output parallel to the load RL.
Statement-I : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect a capacitor across the output parallel to the load RL.
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Statement-II : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect an inductor in series with R₁.
Statement-II : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect an inductor in series with R₁.
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Study Notes
Semiconductors
- Emitter current change: If the emitter current changes by 4 mA, the collector current changes by 3.5 mA, the value of β is 0.875.
- Circuit current: In a circuit with a 1 kΩ and a 2 kΩ resistor, and a 5 V supply the current through the 2 kΩ resistor is approximately 2.5 x 10⁻³ A.
- Transistor radio DC supply: A common transistor radio set requires 12V DC, this is obtained from a transformer and rectifier circuit which is operated on a 220 V AC supply. The number of secondary coil turns is 24. The number of primary turns is 440.
- Zener breakdown: Zener breakdown occurs in a p-n junction with heavily doped regions and a narrow depletion layer.
- Extrinsic semiconductors: When doping level in extrinsic semiconductors increases the Fermi level of p-type semiconductors will go downwards, and Fermi level of n-type semiconductors increases, and Fermi -temperature greater than TF (TF) K, upward whereas TF (TF) K, downward.
Logic Circuits and Gates
- Truth table: Truth tables for various logic circuits are provided for different input combinations (0s and 1s), showing the corresponding outputs for various logic operations.
- Logic Operations: Specific logic circuits perform various operations such as OR, AND, NOR, and NAND operations. The associated truth tables reflect these logic functions.
- Logic Circuit Sequence: A logic circuit's output is determined by the sequence of input values provided. These output values are demonstrated with truth tables.
- Diode characteristics: Diodes have dynamic resistance that varies with current (ID). For example, at 3mA the dynamic resistance is described in the graphs.
- Semiconductor Material: P-N junction LEDs utilize semiconductor materials, in particular Ga-As-P. LEDs emit specific wavelengths/colours of light based on their energy gap.
- Logic Circuit Operation: Some circuits operate as AND, OR gates or other functions such as NOR (not-OR), NAND (not-AND) gates.
Transistor Characteristics
- Amplification factor (β): The amplification factor (beta, β) of a transistor is the ratio of collector current to base current.
- Common emitter amplifier: Transistors operating in common-emitter configuration have a power gain of 106. Circuit resistance values are given to allow calculation of various current parameters.
- Current relation: The relationship between alpha (α), and beta(β) in a transistor is given to relate collector, emitter and base currents.
- Transistor parameters: Typical and output characteristics curves for transistors in common emitter configuration are described with typical current (Ic) to base current (Ib) diagrams, as a function of collector-emitter voltage (VCE).
- Zener diode characteristics: Zener diodes are used as voltage regulators. The zener voltage and the power rating are important characteristics.
- Resistances: Resistor values are important in circuits, and their values are critical in calculations to predict currents and voltages.
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Description
Test your understanding of semiconductors with this quiz. Covering concepts such as emitter current, transistor circuit basics, and Zener breakdown, this quiz will challenge your knowledge of both theory and applications. Ideal for electronics students and hobbyists.
