Exam Question
(a) What are the benefits of 3 Ph supply over a single phase supply system? (6)
(b) Explain 3-wire and 4-wire 3 Phase a.c. Distribution systems. (10)
Class 4 (4th Engineer)
MET
📅 Nov 2023
Reference Answer
### Part (a): Benefits of 3-Phase Supply Over Single-Phase Supply (6 Marks)
A three-phase electrical supply system offers significant advantages over a single-phase system, particularly in marine and industrial applications. These benefits are rooted in principles of efficiency, economy, and operational performance.
1. **Increased Power Delivery & Conductor Economy:**
* For the same line voltage (V) and line current (I), a three-phase system delivers more power. The power formulas are:
A three-phase electrical supply system offers significant advantages over a single-phase system, particularly in marine and industrial applications. These benefits are rooted in principles of efficiency, economy, and operational performance.
1. **Increased Power Delivery & Conductor Economy:**
* For the same line voltage (V) and line current (I), a three-phase system delivers more power. The power formulas are:
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play