Analog Electronics MCQs (Part-3)

Which of the following is a bilateral device?

A Diode
B Transistor
C Resistor
D SCR (Silicon Controlled Rectifier)

What does a small-signal model of a transistor represent?

A Nonlinear behavior
B High-frequency operation
C Linearized behavior around a bias point
D Switching characteristics

What is the main disadvantage of a class B amplifier?

A High distortion
B Low efficiency
C High power consumption
D Limited bandwidth

What is the output of a differentiator circuit when the input is a ramp signal?

A A constant
B A sine wave
C An exponential signal
D A square wave

Which type of feedback improves the stability of an amplifier?

A Positive feedback
B Negative feedback
C Current feedback
D Voltage feedback

Which of the following statements is true for an ideal op-amp?

A It has infinite bandwidth
B It has zero input impedance
C It has finite output impedance
D It requires large input current

Which transistor region is used for amplification in BJTs?

A Cutoff region
B Saturation region
C Active region
D Breakdown region

Which parameter is used to measure the noise performance of an amplifier?

A Gain
B Bandwidth
C Noise figure
D Slew rate

What type of rectifier provides the highest efficiency?

A Half-wave rectifier
B Full-wave rectifier
C Bridge rectifier
D Voltage doubler

What is the main purpose of a current mirror circuit?

A To amplify current
B To stabilize voltage
C To copy current from one branch to another
D To filter noise

What is the effect of thermal runaway in a transistor?

A Increased efficiency
B Constant current flow
C Device failure due to overheating
D Reduced gain

What is the primary purpose of a bypass capacitor in an emitter follower circuit?

A To block AC signals
B To stabilize DC bias
C To increase input impedance
D To reduce voltage gain

Which type of MOSFET is normally ON in the absence of a gate signal?

A Enhancement-mode MOSFET
B Depletion-mode MOSFET
C N-channel MOSFET
D P-channel MOSFET

What determines the cut-off frequency in a low-pass RC filter?

A Resistance only
B Capacitance only
C Both resistance and capacitance
D Inductance

What does the gain-bandwidth product (GBP) represent?

A The product of voltage and current gain
B The trade-off between gain and bandwidth
C The maximum output power
D The noise level