How does a D.C. generator operate on this principle ?
A. Faraday’s law of electromagnetic induction
B. Ohm’s law
C. Lens’s law
D. All of them
DC Generators
D.C Generators Mcqs
When a coil lies, are brush short-circuiting it ?
A. in any of the above positions
B. along neutral axis
C. along field axis
D. None of them
Which DC generator is usual to charge car batteries ?
A. series generator
B. long shunt compound generator
C. shunt generator
D. All of them
About D.C. generators, is it considered suitable for the armature voltage control to be activated when the machine is powered ?
A. at constant torque
B. at constant VA
C. at constant load
D. at constant current
When D.C. generators are not in use, the distribution of air gap flux in space is:
A. pulsating
B. flat topped
C. sinusoidal
D. triangular
Which of the following D.C. generator parts are necessary to the DC generator’s ability to produce direct current ?
A. Eye bolt
B. Equilizer rings
C. Commutator
D. Dummy coils
Which of the following D.C. generators can build up without the poles having any remaining magnetism ?
A. Compound generator
B. Series generator
C. Shunt generator
D. None of them
Is fractional pitch winding utilized in a DC machine ?
A. to increase the generated voltage
B. o save the copper because of shorter end connections
C. to reduce sparking
D. Both b and c
A compound generator has an open circuit voltage of 250 V. What is the terminal voltage at full load ?
A. may be greater or less than 250 V
B. will always be 250 V
C. will be less than 250 V
D. None of them
If you were feeding long D.C. transmission lines, which generator would you choose:
A. Shunt generator
B. Flat compound generator
C. Series generator
D. Over compound generator