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Electronics (ECE) - MCQ Practice Questions

Practice free Electronics (ECE) multiple-choice questions with detailed answers and explanations. Perfect for competitive exam preparation.

400 questions | 100% Free

Q.41Easy

Which of the following is true about intrinsic semiconductors at room temperature?

Q.42Easy

A BJT in saturation mode has:

Q.43Easy

The thermal voltage (VT) at 300K is approximately:

Q.44Easy

In an enhancement-mode NMOS transistor, the threshold voltage (VTh) is:

Q.45Medium

A MOSFET operating in triode (linear) region exhibits:

Q.46Medium

Which statement correctly describes the Early effect in BJTs?

Q.47Medium

In a Zener diode regulation circuit, increasing load current causes:

Q.48Medium

A Schottky diode compared to a pn-junction diode has:

Q.49Medium

The breakdown mechanism in a Zener diode at low doping concentrations is primarily:

Q.50Medium

In a BJT common-emitter amplifier, if input impedance needs to be increased, the preferred biasing technique is:

Q.51Hard

When a BJT is used as a switch in saturated condition, the overdrive factor is defined as:

Q.52Hard

A JFET in pinch-off condition means:

Q.53Hard

In practical MOSFET applications for RF circuits, which parasitic effect limits frequency response most?

Q.54Hard

The noise figure of a BJT amplifier at low frequencies is primarily determined by:

Q.55Medium

For a given application, selecting a BJT with higher β (current gain) results in:

Q.56Hard

In a MOSFET differential amplifier, the common-mode gain is reduced by using:

Q.57Hard

The avalanche multiplication factor M in reverse-biased junction is expressed as:

Q.58Easy

In a p-n junction diode, the depletion width increases with:

Q.59Easy

The diffusion potential (built-in potential) of a silicon p-n junction at room temperature is approximately:

Q.60Medium

Which of the following statements about tunnel diodes is INCORRECT?