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- 1. Multiple Choice
Select the correct statement regarding Faraday's induction ring
Faraday applied AC to the primary and observed AC in the secondary
Faraday switched DC in the primary and obtain continuous AC in the secondary
Faraday switched DC in the secondary and obtained spikes of DC in the primary detected using a compass needle
Faraday switched DC in the primary and obtained spikes of DC in the secondary detected using a compass needle
- 2. Multiple Choice
Which symbol corresponds to a transformer used at 50 Hz?
- 3. Multiple Choice
Which transformer loss increases as the current drawn increases?
Copper loss
Eddy current loss
Hysteresis loss
Leakage flux loss
- 4. Multiple Choice
Which transformer loss increases the most as the frequency increases?
Copper loss
Eddy current loss
Hysteresis loss
Leakage flux loss
- 5. Multiple Choice
Which output voltage is NOT possible for this transformer?
9 V
15 V
18 V
23 V
33 V
- 6. Multiple Choice
Which text equation is correct for a double-wound transformer?
Secondary current + no-load current = primary current
Primary current = secondary current + no-load current
Referred secondary current = primary current - no-load current
no-load current = primary current + referred secondary current
- 7. Multiple Choice
Increasing the cross-sectional area of a DW 230 V transformer core:
Allows a higher voltage to be applied
Increases the secondary voltage
Increases the core flux density
Reduces the flux in the core
- 8. Multiple Choice
The dot notation:
ensures the magnetic field around a current-carrying conductor can be identified
identifies the transformer input terminals
identifies the transformer output terminals
ensures the output and input can be
in-phase
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