2 MVA
5 MVA
7.5 MVA
10 MVA
Answer is Right!
Answer is Wrong!
Electrical engineering
2. The armature of D.C. generator is laminated to
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
3. In a Weston frequency meter, the magnetic axes of the two fixed coils are
Parallel
Perpendicular
Inclined at 60°
Inclined at 15°
Answer is Right!
Answer is Wrong!
Detailed SolutionIn a Weston frequency meter, the magnetic axes of the two fixed coils are
4. The direction of rotation of a D.C. series motor can be changed by
Interchanging supply terminals
Interchanging field terminals
series motor can be changed by A. Interchanging supply terminals B. Interchanging field terminals C. Either of (A) and (B) above
None of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionThe direction of rotation of a D.C. series motor can be changed by
5. 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
6. In the case of an unsymmetrical alternating current the average value must always be taken over
Unsymmetrical part of the wave form
The quarter cycle
The half cycle
The whole cycle
Answer is Right!
Answer is Wrong!
7. In which of the following applications D.C. series motor is invariably tried?
Starter for a car
Drive for a water pump
series motor is invariably tried? A. Starter for a car B. Drive for a water pump C. Fan motor
Motor operation in A.C. or D.C.
Answer is Right!
Answer is Wrong!
Detailed SolutionIn which of the following applications D.C. series motor is invariably tried?
8. The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following?
Corrugations
Fins
Tubes
All of the above
Answer is Right!
Answer is Wrong!
9. 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
10. 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