MEC523 Quiz 1 SEM 2 2022/2023

Three bulbs connected in series: [CO1/PO1]

• are brighter than one bulb

• are dimmer than one bulb on its own

• do not light up

• are the same brightness as one bulb

Answer explanation

The energy of the cell is shared between them

What does an electric circuit need to provide energy? [CO1/PO1]

• A bulb

• A cell

• A switch

• A wire

Answer explanation

A battery contains two or more cells

" The algebraic sum of changes in potential around any closed loop must be zero." This statement represents ______ Loop Rule. [CO1/PO1]

• Ampere's

• Kirchhoff's

• Lorentz's

• Biot-Savart's

A Zener diode is popular as a/an ______ [CO1/PO1]

• Rectifier

• Regulator

• Amplifier

• Detector

The power gain of the transistor is maximum in a ______ [CO1/PO1]

• common base mode

• common emitter mode

• common collector mode

• none of these

Answer explanation

Power gain = voltage gain x current gain

common base = low

common collector = medium

common emitter = high

If dopping in the P region is high then N region: [CO1/PO1]

• depletion layer will more towards P

• depletion layer will more towards N

• depletion layer will remain unchanged

• none of these

Answer explanation

In a P-N junction diode, if the P-region is heavily doped than the N -region then, the depletion layer is more on the less doped side

If P-N junction diode is in reverse biased, then ____ [CO1/PO1]

• The direction of applied voltage is same as the direction of barrier potential

• The direction of applied voltage is opposite as the direction of barrier potential

• AC voltage is applied across P-N junction diode

• None of these

In case of an AC input signal in CE transistor load line can be given by a plot of _____ [CO1/PO1]

• VCE and IC

• VBE vs IC

• VCE and RC

• VBE vs IB

In a bipolar transistor, alpha is the ratio of _____ [CO1/PO1]

• collector current to emitter current

• emitter current to collector current

• base current to collector current

• collector current to base current

A transistor has a typical value of β = 200, if the collector current is 15mA, the base current will be _____ [CO1/PO1]

• 0.75 mA

• 0.3 mA

• 0.075 mA

• 7.35 mA