A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

31.9 Ω

15.9 Ω

31.1 Ω

15.1 Ω

31.9 Ω

15.9 Ω

31.1 Ω

15.1 Ω

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

Armature current.

Field excitaion.

Armature voltage.

Supply voltage.

Armature current.

Field excitaion.

Armature voltage.

Supply voltage.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

wave-wound machine will have more rated current and more voltage

lap-wound machine will have more rated voltage and less current

wave-wound machine will have more rated voltage and less current

lap-wound machine will have more rated voltage and more current

wave-wound machine will have more rated current and more voltage

lap-wound machine will have more rated voltage and less current

wave-wound machine will have more rated voltage and less current

lap-wound machine will have more rated voltage and more current

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

thicker.

sipper.

rotor can not have any laminations.

thinner.

thicker.

sipper.

rotor can not have any laminations.

thinner.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
During hunting of a synchronous motor

damper bar develops torque.

field excitation increases.

negative phase sequence currents are generated.

harmonic are developed in the armature circuit.

damper bar develops torque.

field excitation increases.

negative phase sequence currents are generated.

harmonic are developed in the armature circuit.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

1000 W, 5040 W.

6000 W, 7000 W.

100 W, 2000 W.

3190 W, 5040 W.

1000 W, 5040 W.

6000 W, 7000 W.

100 W, 2000 W.

3190 W, 5040 W.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines Variation in speed by ward-Leonard control of DC motors occurs due to variation in

Electrical Machines If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

Electrical Machines In IM the rotor lamination can be ________________ than stator laminations.

Electrical Machines During hunting of a synchronous motor

Electrical Machines In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

Electrical Machines
During hunting of a synchronous motor

Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)