Electrical Machines Lab - 1 Viva/Online exam

Series motor

• can be started on no load

• can't be started on no load

• can be started either No load or full load

• started with full load

Long compound motor has

• Shunt parallel to series winding alone

• Shunt parallel to armature alone

• Shunt parallel to both shunt and series field

• Series field parallel to armature winding

A shunt motor connected with voltmeter, ammeters and allowed to run on no load at rated voltage - Identify the experiment

• Hopkinson. s test

• Load test

• Retardation test

• Swinburne's test

Formula (s1-s2)r.g is for

• finding output

• finding torque

• finding input

• finding speed

Critical field resistance is

• maximum resistance in the shunt field

• maximum resistance in the armature

• maximum resistance in the series field

• maximum resistance in the starter

Identify the set up

• Load test on d c shunt generator

• Load test on d.c. shunt motor

• Load test on series generator

• Load test on series motor

How to obtain the curve

• Load test d.c. series generator

• Load test d.c. shunt motor

• Load test d.c. series motor

• Load test d.c. shunt generator

Sumpner's test need

• two different rated transformer

• Two identical shunt machine

• Two different rated shunt machine

• two identical transformer

MC meter is used to measure

• ac

• dc

• ac or dc

• ac and dc

Output power of motor

• $\frac{2\pi N\tau}{60}$

• $\frac{2\pi N}{60}$

• $\frac{N\tau}{60}$

• $\frac{2\pi N\tau}{120}$