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

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Answer :

Lap winding is composed of any even number of conductors.

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

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

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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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A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.

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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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280 views 1 answer
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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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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 :

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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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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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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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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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

Answer :

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

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

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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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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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93 views 1 answer
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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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256 views 1 answer
Description :

Answer :

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

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

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Description :

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

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

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114 views 1 answer
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
Description :

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

Answer :

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

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498 views 1 answer
Description :

Answer :

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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Description :

Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it. 

Answer :

Circuit Diagram: Waveforms:

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305 views 1 answer
Description :

operation of half wave rectifier type AC Voltmeter.

Answer :

 Half-wave Rectifier Voltmeter The d'Arsonval meter movement only responds to the average or dc value of the current through the moving coil. In order to measure alternating ... ) input voltage signal alternating signal needs to be rectified first by using diode rectifier to produce 

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216 views 1 answer
Description :

State the concept of continuous wave RADAR. Sketch its block diagram. State its any two applications.

Answer :

Concept- Transmission is continuous here, the circulator is used to provide isolation between the transmitter and the receiver. Since transmission is continuous, it would be pointless to use a ... It is used to measurement of relative velocity to distinguish moving target from stationary objects 

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82 views 1 answer
Description :

State advantages and disadvantages of continuous wave Radar

Answer :

Advantages continuous wave RADAR : 1.Single frequency transmission and hence narrow receiver bandwidth 2.Duty cycle is unity, so mean power can be as high as transmitters will permits. 3.Ability ... required for receiver and transmitter. 3.Cannot detect targets crossing its beam at right angles.

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85 views 1 answer
Description :

Justify electromagnetic wave is said to be transverse wave. 

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Transverse electromagnetic wave:- The electromagnetic waves are oscillations which propagate through free space. In electromagnetic waves the direction of electric field, magnetic field & propagation are ... electric field vector with respect to the surface (i.e. looking at the horizon) 

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Description :

Define : i) Average value ii) RMS value of an AC Wave.

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i) Average value: The average value is defined as the average of all instantaneous values during one alternation . That is, the ratio of the sum of all considered instantaneous values to the ... as produced by the alternating current when flowing through the same resistance for the same time.

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Description :

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.

Answer :

Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.

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Description :

Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.

Answer :

Single phase fully controlled half wave converter:  The circuit diagram of single-phase half-wave controlled rectifier with RL load and without freewheeling diode is shown in Fig. (a). The SCR T is ... , when again pulse is applied, the SCR is turned on & the above cycle is repeated. 

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Description :

Instantaneous value of a sine wave voltage

Answer :

Instantaneous value of a sine wave voltage

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Description :

Draw a labeled block diagram of sine wave generator and state function of each block. 

Answer :

Function Generator:  This instrument can deliver sine, triangular & square waves with frequency range of 0.01 Hz to 100 kHz.  The frequency control network is governed by a frequency ... voltage reaches a predetermined level on the negative slope of the integrator's output voltage.

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332 views 1 answer
Description :

Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.

Answer :

1. In positive half cycle (0 to Π): The end A of the secondary winding becomes positive and end B negative. This makes diode D1 and D4 forward biased while diode D2 and D3 are reverse biased. These two diodes will ... D2 and D3 when it is conducting is as follows.  B - D2 - RL - D3 - A 

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Description :

The coefficient of reflection for current wave is

Answer :

The coefficient of reflection for current wave is 1 or -1

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Description :

The velocity of travelling wave through a cable of relative permittivity 36 is

Answer :

The velocity of travelling wave through a cable of relative permittivity 36 is 0.5 x 108 m/sec

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408 views 1 answer
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