MOSFET

1. The MOSFET stands for.....

• Metal oxidized selenium FET

• Metal oxide surface FET

• Metal oxide semiconductor FET

• Metal of surface FET

Describe the difference between enhancement-mode and depletion-mode MOSFETs.

• Enhancement-mode MOSFETs are normally on; depletion-mode MOSFETs are normally off.

• Enhancement-mode MOSFETs are normally off; depletion-mode MOSFETs are normally on.

• Both enhancement-mode and depletion-mode MOSFETs are normally off.

• Enhancement-mode MOSFETs can conduct without a gate voltage; depletion-mode MOSFETs require a gate voltage to turn off.

Which MOSFET type can operate in both enhancement and depletion modes?

• E Mosfet

• D Mosfet

• E mosfet and D Mosfet

• None of above

Which of the following materials is used as the insulating layer in a MOSFET?

• Germanium oxide

• Silicon oxide

• Silicon dioxide

• Germanium dioxide

In an N-channel MOSFET, how is current controlled?

• By changing the gate current

• By changing the voltage between gate and source (V_GS)

• By changing the resistance between drain and source

• By varying the body voltage

What happens when the gate-to-source voltage (V_GS) of an N-channel Enhancement MOSFET is zero?

• The MOSFET is ON

• The MOSFET is OFF

• The MOSFET operates in saturation mode

• The MOSFET is in cutoff region

Which of the following is a disadvantage of MOSFETs?

• High input impedance

• High switching speed

• Susceptibility to damage from electrostatic discharge (ESD)

• Low efficiency in high-power applications

A certain D Mosfet has I_{DSS =} 10mA, V_P = -4V. Calculate drain current I_D when V_GS = -2V

• 5mA

• 2.5mA

• 7.5mA

• 10mA

What happens to the width of the conductive channel in a Depletion-mode MOSFET when a negative gate voltage is applied?

• It increases

• It decreases

• It remains unchanged

• The MOSFET enters breakdown

What is the threshold voltage (V_TH) of an Enhancement-mode MOSFET?

• The minimum drain-to-source voltage required for conduction

• The voltage at which the MOSFET turns OFF

• The minimum gate-to-source voltage required to create a conducting channel

• The maximum drain-to-source voltage before breakdown