Class 4 (4th Engineer) MET 📅 Apr 2023

Exam Question

(a) List the different combinations of motor-generators that are often made, to suit load conditions. (6)

(b) A diesel engine has a measured indicated power of 7.5 kW and a mechanical efficiency of 85 percent. It drives a generator which supplies a lamp load at 110V.

How many 60W lamps can be supplied, if the efficiency of the generator is measured to be 88 percent? Find the total load current. (10)

Reference Answer

### Part (a): Motor-Generator Combinations
Motor-Generator (MG) sets are employed on board ships to convert electrical power from one form to another, suiting specific load requirements. The following are the common combinations:
1. **AC Motor driving a DC Generator (Rotary Converter/Rectifier):**
* **Purpose:** To produce a Direct Current (DC) supply from the ship's main Alternating Current (AC) system.

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