WorksheetsQUIZ TOPIC 3
Total questions: 10
Worksheet time: 5mins
What is the meaning of Direct Current (DC)?
Current that changes direction periodically
Current that flows in only one direction
Current without voltage
Current used only for motors
Alternating Current (AC) changes direction every…
30°
90°
Half cycle
10 seconds
Single phase AC has a phase difference of:
90°
120°
180°
No phase difference
The advantage of three phase over single phase is:
Less stable
More stable and efficient power delivery
Less efficient
Suitable only for lighting
The equation of AC voltage is:
V = IR
V(t) = Vm sin(ωt + θ)
P = VI
V = Vm / t
The maximum value of an AC waveform is called:
RMS
Average
Peak (Vm)
Instantaneous
The typical circuit symbol for DC is:
Sine wave
Straight line with + and –
Repeating square pattern
No symbol
The typical circuit symbol for AC is:
Sine wave
Straight line
Battery symbol
Box shape
In the AC vs DC graph, the DC waveform appears as:
Rising pattern
Sine wave
Triangle wave
Flat line
The device used to convert AC to DC is called:
Transformer
Control valve
Rectifier
Converter
