reduce the bulk
provide the bulk
generator is laminated to A. reduce the bulk B. provide the bulk C. insulate the core
reduce eddy current loss
Answer is Right!
Answer is Wrong!
Detailed SolutionThe armature of D.C. generator is laminated to
D.c. Generators
2. D.C. generator generally preferred for charging automobile batteries is
Series generator
Shunt generator
generator generally preferred for charging automobile batteries is A. Series generator B. Shunt generator C. Long shunt compound generator
Any of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionD.C. generator generally preferred for charging automobile batteries is
3. Armature reaction of an unsaturated D.C. machine is
Cross-magnetizing
Demagnetizing
machine is A. Cross-magnetizing B. Demagnetizing C. Magnetizing
None of above
Answer is Right!
Answer is Wrong!
Detailed SolutionArmature reaction of an unsaturated D.C. machine is
4. The critical resistance of the D.C. generator is the resistance of
Field
Brushes
generator is the resistance of A. Field B. Brushes C. Armature
Load
Answer is Right!
Answer is Wrong!
Detailed SolutionThe critical resistance of the D.C. generator is the resistance of
5. According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of
Motion of conductor
Lines of force
Either of the above
None of the above
Answer is Right!
Answer is Wrong!
6. In D.C. generators the polarity of the interpoles
Is the same as that of the main pole ahead
Is the same as that of the immediately preceding pole
generators the polarity of the interpoles A. Is the same as that of the main pole ahead B. Is the same as that of the immediately preceding pole C. Is opposite to that of the main pole ahead
Is neutral as these poles do not play part in generating e.m.f.
Answer is Right!
Answer is Wrong!
Detailed SolutionIn D.C. generators the polarity of the interpoles
7. In case of D.C. machines, mechanical losses are primary function of
Current
Voltage
machines, mechanical losses are primary function of A. Current B. Voltage C. Speed
None of above
Answer is Right!
Answer is Wrong!
Detailed SolutionIn case of D.C. machines, mechanical losses are primary function of
8. The following constitute short-circuit in the armature winding.
Insulation failure between two commutator bars
Insulation failure between two turns of a coil
Two of more turns of the same coil getting grounded
All of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionThe following constitute short-circuit in the armature winding.
9. The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage
Will be less than 250 V
Will always be 250 V
May be greater or less than 250 V
None of the above
Answer is Right!
Answer is Wrong!
10. In a D.C. generator in case the resistance of the field winding is increased, then output voltage will
Increase
Decrease
generator in case the resistance of the field winding is increased, then output voltage will A. Increase B. Decrease C. Remain unaffected
Fluctuate heavily
Answer is Right!
Answer is Wrong!