A separately excited dc motor having 2 ohm armature resistsance draws a curren

A separately excited dc motor having 2 ohm armature
resistsance draws a current of 10A and torque developed is
20 Nm under rated field condtion. the speed of the motor
under the rated field condtion , when it is connected to a
100V DC source and delivering 10Nm torque....

Question Posted / sandeep prabha

2 Answers
5365 Views
DRDO, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

A separately excited dc motor having 2 ohm armature resistsance draws a current of 10A and torque ..

Answer / sandeep prabha

any clu... Thanks in advance

Is This Answer Correct ?

4 Yes

0 No

A separately excited dc motor having 2 ohm armature resistsance draws a current of 10A and torque ..

Answer / dharannya

Basic separately excited motor equations are

V=E+Ia*Ra-------------(1)
E=K*W-----------------(2)
T=K*Ia----------------(3)

from the first set of data ie Ra=2, Ia=10 T=20,
and from equation (3)
20=K*10
therefore K=2.

with this knowledge of K
continuing to 2nd set of data ie V=100 and T=10
again from eqn(3) we get Ia as 5A

knowing Ia Ra and V from eqn (1) we get E as 90V

from eqn(2) knowing the values of E and K we obtain w(omega,
ie speed) as 45 rad/sec or 416.67 rpm

Is This Answer Correct ?

1 Yes

2 No

Post New Answer

More Electrical Engineering Interview Questions

Explain the functioning of diode?

0 Answers

What is eddy current & eddy current loss ?

2 Answers

sir plz send some previous year questions of jspl.

0 Answers

What do you mean by a current transformer?

0 Answers

Where -48 volt DC use & why?????????

10 Answers Ericsson, INDUS, Indus Towers, Telecom,

where any change in supply line due to the incipient faults in three phase induction motor

2 Answers ABB,

Is there any abbrevation for STUB in Stub bus protection

0 Answers

What is the basic principal, by which DC voltage level is increased more than the supplied AC voltage during conversion. As upto AC level it is contorrled by firing anlge but after maximum level how is it possible.Please clear picture. OR we have to supply the higher level AC?

0 Answers

X is a uniformly distributed random variable that takes values betweeen 0 and 1.The value of E {X3}(x cube) will be.

1 Answers GATE,

Name of the relay of low lub oil presuure in DG sets

0 Answers Lineage, Sterling,

Waht will happened if reactive power increase in the line? waht about active power increase too?

3 Answers

why all the feeders are designed in a particular manner ... is there any reason for that???

0 Answers

For more Electrical Engineering Interview Questions Click Here