cameroon gce A level 2022 Automatic Control of Electrical Machines 1

cameroon gce A level 2022 Automatic Control of Electrical Machines 1

cameroon gce A level 2022 Automatic Control of Electrical Machines 1

If an extra resistance is connected in the rotor
circuit of a slip ring induction motor, then
A Starting current and torque decreases
B Starting current increases and torque
decreases
C Starting current decreases and torque
increases
D Starting current and torque increases

–1 -3
a b c Figure: 2
Figure 1
The figure l shows symbols of command
organs. The command organ operated by
pulling is
The starter of figure–2 has:
One starting steps.
Three starting steps.
Four starting steps.
Two starting steps.
ABCD
A b
B c
C d
D a
A three phase 220V, 50Hz supply network
supplies a three–phase tetra–polar wound rotor
induction motor whose name plate carries
220V/380V. This motor shall be coupled to the
supply network in
.
A Star
B Zigzag
C Delta–star
D Delta
8.
How many starting steps has an autotransformcr starter?
A ONE
B TWO
C THREE
D FOUR