**Lab Incharge:** Raju Shrestha*, raju.shrestha@pcampus.edu.np*

**Lab Technician: ***Krishna Saud*

**1. Electric Machine I- Lab**

This lab is based on the subject “Electric Machines I” which is the core subject of Electrical taught to the second year.

- Magnetic Circuits

- To draw a B-H curve for two different samples of Iron Core
- Compare their relative permeabilities

- Two Winding Transformers

- To perform turn ratio test
- To perform open circuit (OC) and short circuit (SC) test to determine equivalent circuit parameter of a transformer and hence to determine the regulation and efficiency at full load
- To examine exciting current harmonics

- DC Generator

- To draw open circuit characteristic (OCC) of a DC shunt generator and to calculate: (a)Maximum voltage built up (a)Critical resistance and critical speed of the machine
- To draw load characteristic of a shunt generator

- DC Motor

- Speed control of DC Shunt motor by (a) armature control method (b) field control method
- To observe the effect of increasing load on DC shunt motor’s speed, armature current, and field current.

- 3-phase Induction Machines

- To draw torque-speed characteristics and to observe the effect of rotor resistance on torque-speed characteristics
- To perform no load and blocked rotor test to evaluate equivalent circuit parameters

**2. Electric Machine II-lab **

This lab is based on the subject “Electric Machine II” which is the core subject of Electrical taught to third-year students.

- To study No-load characteristics of a 3-phase synchronous generator
- To study load characteristics of a synchronous generator with (a) resistive load (b) inductive load and (c) capacitive load
- To study the effect of excitation on the performance of a synchronous motor and to plot V- curve
- To study the effect of a capacitor on the starting and running of a single-phase induction motor
- To study the operating characteristics of universal motors

**3. Power Electronics Lab**

This lab is based on the subject “Power Electronics” of our fourth-year students. There is a total of 5 lab assignments. Following are carried out:

- Study of single-phase rectification with diode and thyristor
- Study of three-phase rectification with diode and thyristor
- Study of DC conversion using chopper circuit
- Study of DC to AC conversion with resistive load
- Study of AC voltage controller with resistive load

**4. Utilization of Electrical Energy**

This lab is based on the subject “Utilization of Electrical Energy” which is taught to fourth-year students. There are total of 4 lab assignments. This lab is carried out as follows:

- Speed Control of DC shunt motor by controlled rectifier
- Speed Control of Induction motor by rotor rheostat method
- Speed Control of Induction motor by the frequency control method
- Study of PWM controller for an ac machine