Electrical Engineering MCQs on DC Generator
Contents
- 1 Brushes of DC machines are made of
- 2 In generators, lap winding is employed for
- 3 A cumulatively compounded long shunt generator when operated as a motor would be
- 4 Magnetic field in generator is produced using
- 5 In case of flat compounded generator
- 6 In a DC generator the critical resistance can be increased by
- 7 Lap winding comprises of
- 8 The bearings used to support the rotor shafts are usually
- 9 A shunt generator can self-excite if
- 10 The generator can be considered as a
Brushes of DC machines are made of
Brushes of DC machines are made of
- Carbon
- Hard copper
- Soft copper
- All of these
Correct answer: 1. Carbon
In generators, lap winding is employed for
In generators, lap winding is employed for
- High voltage, high current
- High voltage, low current
- Low voltage, high current
- Low voltage, low current
Correct answer: 3. Low voltage, high current
A cumulatively compounded long shunt generator when operated as a motor would be
A cumulatively compounded long shunt generator when operated as a motor would be
- Cumulatively compounded long shunt
- Cumulatively compounded short shunt
- Differentially compounded long shunt
- Differentially compounded short shunt
Correct answer: 3. Differentially compounded long shunt
Magnetic field in generator is produced using
Magnetic field in generator is produced using
- Electromagnets
- Permanent magnets
- Both of above
- None of above
Correct answer: 1. Electromagnets
In case of flat compounded generator
In case of flat compounded generator
- Generated voltage is proportional to the load on the generator
- Speed varies in proportion to the load on the generator
- Voltage generated is less than the rated voltage
- Voltage remains constant irrespective of the load
Correct answer: 4. Voltage remains constant irrespective of the load
In a DC generator the critical resistance can be increased by
In a DC generator the critical resistance can be increased by
- Decreasing its field resistance
- Decreasing its speed
- Increasing its field resistance
- Increasing its speed
Correct answer: 4. Increasing its speed
Lap winding comprises of
Lap winding comprises of
- Even number of conductors
- Odd number of conductors
- Any of above
- None of above
Correct answer: 1. Even number of conductors
The bearings used to support the rotor shafts are usually
The bearings used to support the rotor shafts are usually
- Ball bearings
- Bush bearings
- Magnetic bearings
- Needle bearings
Correct answer: 1. Ball bearings
A shunt generator can self-excite if
A shunt generator can self-excite if
- Irrespective of the value of the resistance in the field circuit
- Resistance of the field circuit is greater than critical value
- Resistance of the field circuit is less than critical value
- None of these
Correct answer: 3. Resistance of the field circuit is less than critical value
The generator can be considered as a
The generator can be considered as a
- Power pump
- Prime mover
- Rectifier
- Rotating amplifier
Correct answer: 4. Rotating amplifier