- The brushes in Dc machines are used for collecting the current from the commutator segment.
- The brushes are made from carbon.
- In Dc machines Number of brushes are equal to the number of parallel paths or the number of poles.
- For wave winding, a number of parallel paths are equal to 2 and the number of brushes is required also 2.
- For lap winding, the number of parallel paths(A) is equal to the number of poles(P) and a number of brushes required in lap winding are equal to the number of poles.
- In lap winding, there are equalizer rings are required for good commutation. The equalizer rings are used in lap winding because there are more parallel paths in lap winding than in wave winding.
- The equalizer rings are used in lap winding to reduce the unequal current distribution at brushes and reduce the sparking between the carbon brushes and commutator.
- In wave winding, there are dummy coils are used.
- The dummy coil provides the mechanical balance to the rotor only and dummy coils are physically connected but electrically not connected. Dummy coils are used in DC machines for reducing mechanical unbalance.
- The lap winding is used in low voltage and high current applications.
- The wave winding is used in high voltage and low current applications.
- The efficiency of the lap winding is less and the efficiency of the wave winding is more.
- In simplex lap winding number of parallel paths is equal to the number of poles.
- In duplex lap winding, the number of parallel paths is equal to twice the number of poles.
- In triplex lap winding, the number of parallel paths is equal to the thrice the number of poles.
- The wave winding is called incomplete winding and some slots remain empty. these empty slots are filled with dummy coils.
- There is more emf induced in the wave winding and less emf induce in lap winding.
- The other name for lap winding is parallel winding or multiple winding.
- The other name for wave winding is two circuits or series winding.
- For simplex lap winding range of the winding pitch of (2,-2). For progressive winding pitch = Forward pitch - Backward pitch.
- For simplex lap winding, commutator pitch is equal to 1 and -1.
- The resultant pitch in lap winding is equal to the difference between the back and front pitches.
- The resultant pitch in wave winding equals the sum of the back pitch and front pitch.
- The brushes in Dc machines are used for collecting the current from the commutator segment.
- The brushes are made from carbon.
- In Dc machines Number of brushes are equal to the number of parallel paths or the number of poles.
- For wave winding, a number of parallel paths are equal to 2 and the number of brushes is required also 2.
- For lap winding, the number of parallel paths(A) is equal to the number of poles(P) and a number of brushes required in lap winding are equal to the number of poles.
- In lap winding, there are equalizer rings are required for good commutation. The equalizer rings are used in lap winding because there are more parallel paths in lap winding than in wave winding.
- The equalizer rings are used in lap winding to reduce the unequal current distribution at brushes and reduce the sparking between the carbon brushes and commutator.
- In wave winding, there are dummy coils are used.
- The dummy coil provides the mechanical balance to the rotor only and dummy coils are physically connected but electrically not connected. Dummy coils are used in DC machines for reducing mechanical unbalance.
- The lap winding is used in low voltage and high current applications.
- The wave winding is used in high voltage and low current applications.
- The efficiency of the lap winding is less and the efficiency of the wave winding is more.
- In simplex lap winding number of parallel paths is equal to the number of poles.
- In duplex lap winding, the number of parallel paths is equal to twice the number of poles.
- In triplex lap winding, the number of parallel paths is equal to the thrice the number of poles.
- The wave winding is called incomplete winding and some slots remain empty. these empty slots are filled with dummy coils.
- There is more emf induced in the wave winding and less emf induce in lap winding.
- The other name for lap winding is parallel winding or multiple winding.
- The other name for wave winding is two circuits or series winding.
- For simplex lap winding range of the winding pitch of (2,-2). For progressive winding pitch = Forward pitch - Backward pitch.
- For simplex lap winding, commutator pitch is equal to 1 and -1.
- The resultant pitch in lap winding is equal to the difference between the back and front pitches.
- The resultant pitch in wave winding equals the sum of the back pitch and front pitch.
Power System MCQs With Explanation
The charging current drawn by the cable is
The fact that current density is higher at the surface when compared to the center is known as
In which of the following transmission lines capacitance effect is negligible?
The distribution constant of the transmission line is
Proximity effect is more in case of
If the frequency is increased, then the skin effect will
Bundled conductors in EHV transmission lines help in
Which of the following produces radio interference in communication lines?
Telecommunication lines are transposed to reduce the
What is the function of economizer in Thermal Power Plant
Which of the following effects are associated with transmission line
The insulator thickness on the conductor, in cables, depends upon
By using a guard ring in a transmission line, its string efficiency
If sag in an overhead line increase, the tension in the line
Corona is accompanied by
The conductor carries more current on the surface as compared to the core. This is called as
Critical disruptive voltage is a voltage at which
Bundled conductors are used for EHV transmission lines primarily for reducing the
Low power factor is usually not due to
Bonding is done at both ends of the cable to reduce the
For Improving power factor
Stock bridge dampers are used to
Which of the following insulator is practically used for railway crossings?
Which of the following decides the insulation level of 400 kV, EHV line?
When earth fault occurs
The minimum length of pipe electrode used for earthing should not be less than
A ground wire is used to
Earth resistance in typical domestic wiring is
By which of the following systems electric power may be transmitted?
Which of the following equipment will be most economical for regulating the voltage in the distribution feeder?
Transformer MCQs With Explanation
In a transformer the primary flux is
The noise of the transformer is mainly due to
Buchholz relay is used for the protection
Iron loss in a transformer can be determined by
Oil is provided in an oil-filled transformer for
In a star-delta transformer, the delta side phase voltage leads the star sides phase voltage by an angle
Minimum voltage regulation occurs in transformer when the power factor of the load is
The chemical used in the breather of a transformer should have the property of
The power transformer can be termed as a constant
In a transformer, which of the following losses are zero?
Which of the following Transformer can have a tap changer?
If the supply frequency (f) of a transformer decreases, the effect of frequency on the transformer's secondary output voltage?
The primary winding of a transformer has a 120 V ac supply. What is the value of secondary voltage if the turn ratio is 10?
The efficiency of a power transformer is _____ at full load.
In a transformer the relation between the input frequency and the output voltage on secondary winding is _____.
In a current transformer, _____ winding is closed.
A transformer is a _____ device.
A step-down transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
A step-up transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
Transformer works on ______ principle.
Shell Type Transformer is mainly used for
A Magnetic Oil level Guage (MOG) is used in the Transformer to
The Function Of Power Transformer is/are
The Radiators are used in transformers for
The noise of the transformer is mainly due to
Buchholz relay is used for the protection
Iron loss in a transformer can be determined by
Oil is provided in an oil-filled transformer for
In a star-delta transformer, the delta side phase voltage leads the star sides phase voltage by an angle
Minimum voltage regulation occurs in transformer when the power factor of the load is
The chemical used in the breather of a transformer should have the property of
The power transformer can be termed as a constant
In a transformer, which of the following losses are zero?
Which of the following Transformer can have a tap changer?
If the supply frequency (f) of a transformer decreases, the effect of frequency on the transformer's secondary output voltage?
The primary winding of a transformer has a 120 V ac supply. What is the value of secondary voltage if the turn ratio is 10?
The efficiency of a power transformer is _____ at full load.
In a transformer the relation between the input frequency and the output voltage on secondary winding is _____.
In a current transformer, _____ winding is closed.
A transformer is a _____ device.
A step-down transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
A step-up transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
Transformer works on ______ principle.
Shell Type Transformer is mainly used for
A Magnetic Oil level Guage (MOG) is used in the Transformer to
The Function Of Power Transformer is/are
The Radiators are used in transformers for
Synchronous Motor MCQs With Explanation
In 3 -Φ synchronous motor if one of the phases is short-circuited the motor will
The speed regulation of a synchronous motor is
The negative phase sequence in a three-phase synchronous motor exists when the motor is
What happens if the field winding of the synchronous motor is short-circuited?
For power factor correction, synchronous motors operate at
The speed regulation of a synchronous motor is
The negative phase sequence in a three-phase synchronous motor exists when the motor is
What happens if the field winding of the synchronous motor is short-circuited?
For power factor correction, synchronous motors operate at
Induction Motor MCQs With Explanation
Electrical Interesting Questions | All Posts
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What is XLPE Cables? Applications of XLPE cables
What is Silicon Rubber Insulator? Where Silicon Rubber Insulator is used?
What is a voltage detecting insulator? Where voltage detecting insulators are used?
What Is Vacuum Interrupter? How Vacuum Interrupters Work in Circuit Breaker?
What is Arc Chutes or Arc Divider or Arc Splitters In Circuit Breaker?
What is a High Voltage Detector? Where High Voltage Detector is Used?
What is Wave Trap? Where it is Used?
why generation is 11kv in the power stations?
Why Earth Pin is Thicker and Longer in a 3-Pin Plug?
Why are Bundle Conductors used in Transmission Lines?
What are the Colored Aerial Marker Balls on Power Lines For?
Why is Electric Power Transmission is Multiple of 11 i.e 11kV, 22kV, 66kV, etc?
Why Tertiary Winding is used in transformers?
Why PT and CT Terminals are Star Connected?
What is Oil Surge Relay in Transformer?
What is Stockbridge Vibration Damper In Transmission Line?
Why Stones are used in Sub-Station Switchyard?
Why Arc Horn is used in High Voltage Transmission Line?
Why tester does not work on DC?
What is Auto-Recloser In-Transmission System? How its Works?
What is Aviation Light? Why it is used?
Why Transformer Taps On High Voltage Side?
Why Earthing Transformer is used?
Why does a humming sound occur in high voltage transmission lines?
Why is shunt capacitor bank used in substation?
Why do the positive and negative wires spark when touched?
Why reactors are used in substations?