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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.1Easy

What is the primary function of a PN junction diode?

Q.2Easy

The barrier potential of a silicon PN junction at room temperature is approximately:

Q.3Easy

Which of the following is NOT a characteristic of a Zener diode?

Q.4Easy

In a BJT (Bipolar Junction Transistor), what are the three regions of operation?

Q.5Easy

What is the relationship between collector current (Ic) and base current (Ib) in a BJT?

Q.6Easy

An LED (Light Emitting Diode) emits light when:

Q.7Medium

Which parameter is most important for selecting a heat sink for a power transistor?

Q.8Medium

In a MOSFET, what does the threshold voltage (Vth) represent?

Q.9Medium

A photodiode is primarily used for:

Q.10Medium

In a JFET, the pinch-off voltage (Vp) is the gate-source voltage at which:

Q.11Medium

What is the maximum collector-emitter voltage rating (Vceo) used for?

Q.12Medium

A varactor diode is used primarily for:

Q.13Medium

In a triode vacuum tube, which electrode controls the flow of electrons?

Q.14Hard

A tunnel diode exhibits negative resistance in a specific voltage range due to:

Q.15Hard

For a BJT in saturation, the relationship between base current and collector current is:

Q.16Hard

Which of the following statements about CMOS logic is correct?

Q.17Hard

In a power MOSFET, the on-resistance (RDS_on) is primarily determined by:

Q.18Hard

A Schottky diode offers advantages over PN junction diodes primarily because of:

Q.19Hard

What is the significance of Early voltage (VA) in a BJT?

Q.20Hard

In integrated circuit design, what does the term 'aspect ratio' refer to in MOSFETs?