Electrician Red Seal · Question
A single-phase transformer has a primary winding of 480V and 200 turns. If the secondary voltage is 120V, how many turns are in the secondary winding?
The voltage ratio of a transformer is equal to its turns ratio (Vp/Vs = Np/Ns). Rearranging for Ns gives Ns = (Vs/Vp) * Np. Therefore, Ns = (120V/480V) * 200 tu
Start free practice for Electrician Red Seal
150 questions · no signup required · 40 free questions per day
Question: A single-phase transformer has a primary winding of 480V and 200 turns. If the secondary voltage is 120V, how many turns are in the secondary winding?
Answer options:
- 25 turns ✅ 50 turns
- 100 turns
- 800 turns
Correct answer: 50 turns
Explanation: The voltage ratio of a transformer is equal to its turns ratio (Vp/Vs = Np/Ns). Rearranging for Ns gives Ns = (Vs/Vp) * Np. Therefore, Ns = (120V/480V) * 200 turns = 0.25 * 200 = 50 turns.
Start free practice for Electrician Red Seal
150 questions · no signup required · 40 free questions per day
More about Electrician Red Seal
Related Questions
- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
- During a renovation of a commercial kitchen, an electrician needs to replace an old single-phase, 240 V, 5 kW
- A commercial kitchen is being renovated, and several new 4 kW, 208 V, single-phase electric ovens are being in
- What is the minimum working space depth required in front of an electrical panel rated 200 A, 120/240 V, locat
- A Red Seal electrician is setting up temporary power for a construction site. The main temporary service is a
- A new industrial facility requires a 600 V, three-phase, 150 A feeder to supply a motor control centre. The co
More for Electrician Red Seal candidates
Practice tests
Question explanations
- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
- During a renovation of a commercial kitchen, an electrician needs to replace an old single-phase, 240 V, 5 kW
- A commercial kitchen is being renovated, and several new 4 kW, 208 V, single-phase electric ovens are being in
- What is the minimum working space depth required in front of an electrical panel rated 200 A, 120/240 V, locat
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Electrician Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.