problem 8 unit 3 induction machines

synchronous speed is

full load torque is

slip at maximum torque

Maximum torque

speed at maximum torque

Slip at maximum torque is

• s=X2

• s=R2

• s= $\frac{R2}{X2}$

• s=1

Relationship between starting torque and maximum torque

• $\frac{2a}{a^2+1}$

• $\frac{2as}{a^2+s^2}$

• s=1

Relation between full load torque and maximum torque

• $s=\frac{R2}{X2}$

• $\frac{2as}{a^2+s^2}$

• $\frac{2s}{a^2+1}$

Induction motors are

• synchronous motors

• dc motors

• asynchronous motors

the slip is

• can be positive or negative

• always

• can be only positive

• can be only negative