Electronics

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Q. What is the effect of negative feedback in op-amp circuits?
  • A. Increases gain
  • B. Decreases gain and improves stability
  • C. Increases distortion
  • D. Eliminates noise completely
Q. What is the effect of temperature on semiconductor behavior in series-parallel circuits?
  • A. Increases resistance
  • B. Decreases resistance
  • C. No effect on resistance
  • D. Increases capacitance
Q. What is the effect of temperature on the capacitance of a ceramic capacitor?
  • A. Capacitance increases with temperature
  • B. Capacitance decreases with temperature
  • C. Capacitance remains unchanged
  • D. Capacitance fluctuates randomly
Q. What is the efficiency of an ideal transformer?
  • A. 0%
  • B. 50%
  • C. 100%
  • D. 75%
Q. What is the energy band gap in a semiconductor?
  • A. The energy required to free an electron
  • B. The energy of the conduction band
  • C. The energy of the valence band
  • D. The energy lost in conduction
Q. What is the final voltage across a capacitor in an RC circuit after a long time?
  • A. 0V
  • B. V0
  • C. V0/2
  • D. V0*e^(-t/RC)
Q. What is the formula for calculating the total resistance in a series circuit?
  • A. R_total = R1 + R2 + R3
  • B. R_total = R1 x R2 x R3
  • C. R_total = R1 / R2 / R3
  • D. R_total = R1 - R2 - R3
Q. What is the formula for the time constant in an RL circuit?
  • A. L/R
  • B. R/L
  • C. L+R
  • D. R-L
Q. What is the formula for the time response of a first-order RC circuit to a step input?
  • A. V(t) = V_final(1 - e^(-t/τ))
  • B. V(t) = V_final(e^(-t/τ))
  • C. V(t) = V_initial + (V_final - V_initial)(1 - e^(-t/τ))
  • D. V(t) = V_initial + (V_final - V_initial)e^(-t/τ)
Q. What is the forward voltage drop of a typical silicon diode?
  • A. 0.2V
  • B. 0.7V
  • C. 1.2V
  • D. 0.5V
Q. What is the function of a capacitor in a dynamic RAM (DRAM) cell?
  • A. To amplify signals
  • B. To store charge
  • C. To switch states
  • D. To rectify signals
Q. What is the function of a common-emitter configuration in a BJT?
  • A. To provide high input impedance
  • B. To provide voltage gain
  • C. To provide current gain only
  • D. To act as a switch
Q. What is the function of a coupling capacitor in an amplifier circuit?
  • A. To block DC and allow AC signals
  • B. To amplify the signal
  • C. To provide feedback
  • D. To stabilize the power supply
Q. What is the function of a peak detector circuit using an op-amp?
  • A. To measure average voltage
  • B. To store the peak value of an input signal
  • C. To filter out AC components
  • D. To amplify low-level signals
Q. What is the function of a rectifier in an AC circuit?
  • A. To increase voltage
  • B. To convert AC to DC
  • C. To decrease voltage
  • D. To filter signals
Q. What is the function of a rectifier in power supply circuits?
  • A. To increase voltage
  • B. To convert AC to DC
  • C. To filter noise
  • D. To amplify signals
Q. What is the function of a sample-and-hold circuit in an ADC?
  • A. To amplify the input signal
  • B. To convert the signal to digital
  • C. To maintain a constant voltage level during conversion
  • D. To filter out noise
Q. What is the function of a Schmitt trigger in op-amp circuits?
  • A. To amplify weak signals
  • B. To provide hysteresis in signal switching
  • C. To filter out high-frequency noise
  • D. To integrate input signals
Q. What is the function of a Schmitt trigger?
  • A. To amplify weak signals
  • B. To provide hysteresis in signal processing
  • C. To rectify AC signals
  • D. To store binary data
Q. What is the function of a small-signal model in electronics?
  • A. To analyze large signal behavior
  • B. To simplify the analysis of linear circuits
  • C. To design power amplifiers
  • D. To measure frequency response
Q. What is the function of a Zener diode?
  • A. To rectify AC signals
  • B. To allow current to flow in one direction only
  • C. To provide voltage regulation
  • D. To amplify signals
Q. What is the function of an operational amplifier (op-amp) in a circuit?
  • A. To rectify AC signals
  • B. To amplify voltage signals
  • C. To switch currents
  • D. To store charge
Q. What is the function of an operational amplifier (op-amp) in a feedback configuration?
  • A. To increase the input voltage
  • B. To stabilize the output voltage
  • C. To amplify the difference between two input voltages
  • D. To convert AC signals to DC
Q. What is the function of an operational amplifier (op-amp) in arithmetic operations?
  • A. To perform addition and subtraction
  • B. To amplify signals only
  • C. To filter signals
  • D. To convert digital signals to analog
Q. What is the function of an operational amplifier in arithmetic operations?
  • A. To perform addition and subtraction
  • B. To amplify signals only
  • C. To act as a voltage regulator
  • D. To convert AC to DC
Q. What is the function of the emitter in a BJT?
  • A. To inject charge carriers
  • B. To collect charge carriers
  • C. To control the base current
  • D. To provide biasing
Q. What is the hexadecimal equivalent of the binary number 1010?
  • A. A
  • B. B
  • C. C
  • D. D
Q. What is the input impedance of an ideal op-amp?
  • A. Zero
  • B. Finite
  • C. Infinite
  • D. Depends on the configuration
Q. What is the main advantage of using a Field Effect Transistor (FET) in memory applications?
  • A. Higher power consumption
  • B. Lower input impedance
  • C. Higher input impedance
  • D. More complex fabrication
Q. What is the main advantage of using a PLD over traditional logic circuits?
  • A. Lower cost
  • B. Higher power consumption
  • C. Increased design time
  • D. Flexibility in design
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