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In D.C. generators, lap winding is used for low voltage, high current.

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In the case of lap winding resultant pitch is difference of front and back pitches.

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In lap winding, the number of brushes is always same as the number of poles.

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Lap winding is composed of any even number of conductors.

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Description :

A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively

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A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively 19,17

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In case of D.C. machine winding, number of commutator segments is equal to number of armature coils.

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Wave winding is composed of that even number which is exact multiple of poles + 2.

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The resistance of armature winding depends on length of conductor, cross-sectional area of the conductor, number of conductors.

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In D.C. machines fractional pitch winding is used to reduce the sparking.

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Description :

Aluminium is not used as winding wire for the armature of a dc machine because  (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

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Aluminium is not used as winding wire for the armature of a dc machine because  (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

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 Sandwich type winding is used in 3 phase shell-type transformer.

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Description :

The damping winding in synchronous motor is generally used to?

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The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

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135 views 1 answer
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In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be 8.

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Description :

A _________ is used to measure the stator % winding temperature of the generator.  (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer

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A Resistance thermometer is used to measure the stator % winding temperature of the generator. 

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A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

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In A.C. series motor compensating winding is employed to reduce sparking at the brushes.

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Description :

State advantages of short pitch winding over full pitch winding in alternators. 

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Advantages of Short Pitch Winding over Full Pitch Winding in Alternators: 1) Short pitching reduces the amount of copper needed for end connection when compared with full pitched coil. 2) They ... reduced, thereby increasing the efficiency. 4) The power quality of generated emf is improved. 

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Description :

Damper winding in a synchronous motor

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Damper winding in a synchronous motor Serves to start the motor.

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Description :

A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary?  (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts

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A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary?  (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts

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Description :

Damper winding is provided in 3 phase synchronous motors to :

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Damper winding is provided in 3 phase synchronous motors to : provide starting torque and prevent hunting

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The starting winding of a single-phase motor is placed in stator.

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If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.

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The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.

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In split phase motor main winding is of thick wire placed at the bottom of the slots.

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In split-phase motor auxiliary winding is of thin wire placed at the top of the slots.

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In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.

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In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.

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In a split phase motor, the running winding should have low resistance and high inductance.

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The short circuit in any winding of the transformer is the result of impulse voltage.

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Description :

In synchronous motor, does the winding losses vary with load?

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No, in the synchronous motor the winding losses do not vary with load.

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It is the wire wound around a aluminium metal it is found commonly in transformers or motors

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Description :

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

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A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm

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Answer :

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.

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Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

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Description :

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?

Answer :

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.

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Answer :

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.

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Primary winding of a transformer could either be a low voltage or high voltage winding.

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yes High Voltage side of Transformer winding have more number of turns. and low voltage side of Transformer winding have less number of turns.

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Answer :

If  equalising bar is connected to the 2 DC generators  the current will be equal in 2 generators irrespective of parallel connection so that we connect equaliser bar

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Answer :

Compensating windings are used in D.C. generators to neutralise the cross-magnetising effect of the armature reaction.

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Answer :

For the parallel operation of two or more D.C. compound generators, we should ensure that series fields of all generators should be either on positive side or negative side of the armature.

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Description :

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D.C. generators are normally designed for maximum efficiency around full-load.

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Description :

The stator of a 3 phase, 10 pole induction motor possesses 120 slots. If a lap winding is used, calculate the coil pitch, if the coil width extends from slot 1 to slot 11.  (A) 72.12% (B) 83.30% (C) 12% (D) 42% 

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Answer :

In D.C. generators on no-load, the air gap flux distribution in space is flat topped.

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In D.C. generators the polarity of the interpoles is the same as that of the main pole ahead.

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In D.C. generators, the brushes on commutator remain in contact with conductors which lie under interpolar region.

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In D.C. generators, current to the external circuit from armature is given through commutator commutator.

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In D.C. generators the pole shoes are fastened to the pole core by counter sunk screws.

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D.C. generators are connected to the busbars or disconnected from them only under the floating condition to avoid sudden loading of the primemover, to avoid mechanicaljerk to the shaft, to avoid burning of switch contacts.

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D.C. generators are installed near the load centres to reduce line losses.

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Description :

Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is (A) 48 (B) 24 (C) 192 (D) 96

Answer :

Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is 24

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