Polytechnic Electronics and Electrical Engineering 3

Question 1

What is the impedance of a pure inductor with inductance L at angular frequency ω?

Accepted Answer

Z = ωL

Answer

Z = R

Answer

Z = 1/(ωC)

Answer

Z = ωL + 1/(ωC)

Question 2

A transformer has 200 primary turns and 50 secondary turns. If the primary voltage is 240V, what is the secondary voltage?

Accepted Answer

60V

Answer

960V

Answer

120V

Answer

480V

Question 3

What is the function of a rectifier circuit in power supplies?

Accepted Answer

Converts AC to DC

Answer

Amplifies AC signals

Answer

Converts DC to AC

Answer

Regulates output voltage

Question 4

In Boolean algebra, what is the result of A + Ā (A OR NOT-A)?

Accepted Answer

1

Answer

0

Answer

A

Answer

Ā

Question 5

What is the power dissipated by a 10Ω resistor carrying 2 amperes of current?

Accepted Answer

40W

Answer

20W

Answer

5W

Answer

0.2W

Question 6

Which semiconductor device is primarily used for voltage regulation in circuits?

Accepted Answer

Zener diode

Answer

BJT transistor

Answer

MOSFET

Answer

LED

Question 7

What type of circuit has components connected so they share the same two nodes (same voltage across each)?

Accepted Answer

Parallel circuit

Answer

Series circuit

Answer

Mixed circuit

Answer

Bridge circuit