Quiz on Power Supply & Communication Systems

Which circuit in the power supply converts low voltage AC to pulsating DC?

• Transformer

• Rectifier

• Filter

• Voltage Regulator

Which block in the Power Supply converts pulsating DC to smoothened DC?

• Rectifier

• Filter

• Voltage Regulator

• Step down Transformer

The rectifier that uses single diode is

• Half wave rectifier

• Full Wave Rectifier

• Bi-Phase Rectifier

• Bridge Rectifier

What is the function of block B?)

• Rectifier

• Reservoir capacitor

• Low pass filter

• Regulator

What is the function of block A?

• Transformer

• Half wave rectifier

• Full wave rectifier

• Filter

What will be the approximate value of the DC component of the waveform at the output

of block A?

• Vpkx 0.318

• Vpk x 0.5

• Vpk x 0.637

• VpkK x 0.707

Refer to Fig 1.3.2. If input B is more positive

than input A, which diodes will be conducting?

• D1 and D2.

• D2 and D3

• D1 and D4

• D3 and D4

Refer to Fig 1.3.2. If D4 were to go short circuit, what would be the effect on the operation of the circuit?

• decrease in the current through D1.

• Fuse F1 would blow

• A higher voltage across the load

• A larger peak current through D2 and D3.

What is the action of the reservoir capacitor in a basic power supply circuit?

• To de-couple the DC component of the rectifier AC output.

• To Increase the DC component and reduce the AC component of the AC wave.

• To remove the DC component of the AC wave.

• To regulate the AC wave

Which of the following is an advantage of using a LC low pass filter rather than a RC low pass filter in a

power supply?

• The reactance of L will be much lower than the resistance of R at mains frequency

• The reactance of L will be much higher than the resistance of R at mains frequency.

• An inductor can dissipate more power than a resistor

• LC filters are less expensive than RC filters.