Circuits and Resonance Questions and Answers

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Q41
The early effect in transistors refers to:
  • A Thermal runaway
  • B Base width modulation
  • C Avalanche breakdown
  • D Zener breakdown
Answer: Option B
Explanation: Base width modulation with collector-base voltage variation
Q42
In a JFET, the drain current is controlled by:
  • A Drain voltage
  • B Gate voltage
  • C Source voltage
  • D Body voltage
Answer: Option B
Explanation: Drain current controlled by gate-source voltage
Q43
What is pinch-off voltage in JFET?
  • A Breakdown voltage
  • B Cut-off voltage
  • C Saturation voltage
  • D Peak inverse voltage
Answer: Option B
Explanation: Voltage where channel is completely depleted and ID saturates
Q44
The main advantage of CMOS technology is:
  • A High speed
  • B Low power
  • C High voltage
  • D Low cost
Answer: Option B
Explanation: Very low power consumption in static condition
Q45
In an integrator circuit using op-amp, the feedback element is:
  • A Resistor
  • B Capacitor
  • C Inductor
  • D Diode
Answer: Option B
Explanation: Capacitor provides integration function in feedback path
Q46
What is the function of a sample and hold circuit?
  • A Amplify signals
  • B Sample and hold voltage
  • C Generate clock
  • D Regulate power
Answer: Option B
Explanation: Samples input signal and holds value for ADC conversion
Q47
The resolution of an n-bit ADC is:
  • A 2^n
  • B 2^n - 1
  • C FSR/(2^n)
  • D FSR/(2^n - 1)
Answer: Option D
Explanation: Resolution = Full scale range / (2^n - 1)
Q48
In a PLL, the VCO generates frequency proportional to:
  • A Input frequency
  • B Control voltage
  • C Reference voltage
  • D Supply voltage
Answer: Option B
Explanation: VCO output frequency proportional to input control voltage
Q49
What is the main application of a monostable multivibrator?
  • A Clock generation
  • B Pulse stretching
  • C Frequency division
  • D Voltage regulation
Answer: Option B
Explanation: Generates single output pulse of predetermined width
Q50
The slew rate of an op-amp indicates:
  • A Gain
  • B Bandwidth
  • C Output swing
  • D Speed limitation
Answer: Option D
Explanation: Maximum rate of change of output voltage (V/μs)

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