Class 4 (4th Engineer) MET 📅 Jul 2024

Exam Question

(a) Define work, Power and Efficiency (6)

(b) A shunt motor has an armature resistance of 0.2 ohms and with an armature current of 120 amperes runs at 750 r.p.m. off a 400-volt supply. Calculate the speed and armature current of the motor if the flux per pole is reduced to 75 per cent of its initial value, the total torque remaining unaltered. (10)

Reference Answer

### (a) Definitions
#### 1. Work (W)
Work is defined as the energy transferred to or from an object when a force is applied, causing the object to be displaced. For work to be done, the force must have a component in the direction of the displacement.
* **Formula**: Work is the product of the force (F) and the distance (d) moved in the direction of the force.

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play