Electronics (ECE) - MCQ Practice Questions

A clamping diode in logic circuits is used to:

A Zener diode is operating in reverse breakdown with a current of 50 mA. If the Zener resistance is 5 Ω and Zener voltage is 12 V, what is the terminal voltage?

In a BJT, if the base-emitter junction is forward biased and the base-collector junction is also forward biased, the transistor is operating in which region?

In a photodiode, the photocurrent is primarily determined by which parameter?

In a JFET, as the reverse bias voltage on the gate-source junction increases, what happens to the channel width?

In a p-channel MOSFET, if VGS = -8 V and VT = -2 V, what is the gate-source overdrive voltage?

A power MOSFET has RDS(on) = 0.5 Ω and carries 20 A. What is the approximate conduction power loss?

Which semiconductor material has the highest electron mobility among common choices?

In a silicon p-n junction diode at room temperature (T = 300K), the thermal voltage (VT) is approximately:

Which of the following is NOT a basic logic gate?

The output of a NAND gate is 0 when:

How many 2-input NAND gates are required to implement a 2-input AND gate?

The decimal equivalent of binary number 10110.101 is:

In Gray code, consecutive numbers differ by:

A multiplexer with 8 inputs requires how many select lines?

The BCD equivalent of decimal 47 is:

A full adder has how many inputs and outputs?

A JK flip-flop with J=1, K=1 performs:

In a 4-bit ripple counter using negative edge-triggered flip-flops, if the input frequency is 16 MHz, what is the frequency at the output of the third flip-flop?

Which logic gate produces HIGH output only when both inputs are different?