IEE1 (7)

The electron is a/an _______ charged particle of electricity

• neutral

• negatively

• positively

• zero

Electrons at the outermost shell are called

• free electrons

• outer electrons

• valence electrons

• active electrons

P-type semiconductor has an excess of

• electron

• hole

• proton

• neutron

The depletion region of a junction diode forms the ________ of the capacitor

• Plates

• Dielectric

• package

• none of these

A semiconductor frequently used to rectify AC current to DC is called

• zinc oxide

• transistor

• tube

• diode

The resistor is connected across an AC supply of 220 V The power drawn is 1000 W If a diode were

connected in series with the resistor, what would be the power absorbed by the resistor?

• 850 W

• 250 W

• 200 W

• 500 W

A circuit consists of a resistor which is connected in series with a perfect diode. When connected across a 20 V battery, then current measured 10 A. However, when connected across a 30 V battery but with a reverse polarity, what would be the new current?

• 15 A

• zero current

• 20 A

• None of these

In order to measure the voltage signals from a filtered rectifier circuit, DC and AC voltmeters were used

The readings were 30 V DC and 2.5 V rms respectively Determine the ripple of the output voltage.

• 9%

• 8.33%

• 7%

• 7.33%

An ideal full wave rectifier with a non inductive load has zero transformation losses. What is the efficiency?

• 100

• 90

• 80

• 70

An unregulated power supply which consists of a transformer, a rectifier and a filter has some

characteristics which are as follows EXCEPT one. Which one is this?

• It has good voltage regulation.

• It is relatively expensive.

• The output voltage vanes with the load

• The output voltage depends on the input voltage