Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / abhi
Hopkinson's test is another useful method of testing the efficiency of a dc machine. It is a full load test and it requires two identical machines which are coupled to each other. One of these two machines is operated as a generator to supply the mechanical power to the motor and the other is operated as a motor to drive the generator. For this process of back to back driving the motor and the generator, Hopkinson's test is also called back-to-back test or regenerative test.
If there are no losses in the machine, then no external power supply would have needed. But due to the drop in the generator output voltage we need an extra voltage source to supply the proper input voltage to the motor. Hence, the power drawn from the external supply is therefore used to overcome the internal losses of the motor-generator set.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
Where is servomechanism used?
If 24 KVA AVR having Input voltage 200-400v, Output voltage 415+-1%, what will be the voltage if Load is 13A.
In the ACB breaker capacity is 2000Amp but this each phase taken 1250 But total beldibg load is 600amp or 700amp watt is the problem
Define early construction of human being
Is electro plating what type of load whether resistive, inductive or capacitive loads
which type of stability limit is higher,steady state or transient? why?
WE ARE PLACE A NEW 75 KW MOTOR FOR JPF.IT IS CONNECTED IN M.C.C. WHEN WE ARE STARTING M.C.C.INCOMER IS TRIPPED.THEN WE ARE CONNECTED IN P.C.C WITH A MM30 RELAY PROTECTION THEN WE ARE STARTED MOTOR WILL RUN SMOOTHLY.
Write down the brushes of a de machine.
what is the difference b/w UHVDC and HVDC(LIGHT)?
Hoe do calculate the Cable size for Amps rating ?
PLEASE SEND THE PREVIOUS YEARS QUESTION PAPERS OF RRB JUNIOR ENGINEER-ELECTRICAL
how to discharge 3 phase power factor correction capacitors
Single line diagram for dbb (double bus bar)system.
Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??
what are the possible reaons & remedies if resistance of NGR getting heat up
