Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
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Apr 27, 2020
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anonymous

Last Answer : Low voltage side is short circuited.
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163 views
1 answer
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Sep 27, 2017
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anonymous

Last Answer : Primary is high voltage side and Secondary is low Voltage side.
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123 views
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Sep 27, 2017
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anonymous
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Last Answer : In short circuit test of transformer the low voltage side is short circuited . On high voltage side the voltmeter is connected in parallel and ammeter in series and also a wattmeter is ... circuit test is done for determining impedance and losses. In this test iron losses is neglected.
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169 views
1 answer
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Sep 3, 2017
by
anonymous

State advantages of short pitch winding over full pitch winding in alternators.
Last Answer : 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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478 views
1 answer
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May 7, 2020
by
anonymous

If the % reactance upto the fault point is 20%, then the short circuit current will be
Last Answer : If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current
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3.0k views
1 answer
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May 8, 2018
by
anonymous

In which fault the maximum short circuit current occurs?
Last Answer : In three phase bolted fault the maximum short circuit occurs.
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130 views
1 answer
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Mar 19, 2018
by
anonymous

Last 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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215 views
1 answer
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Mar 20, 2018
by
anonymous

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
Last Answer : 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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223 views
1 answer
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May 8, 2018
by
anonymous

Last Answer : Primary winding of a transformer could either be a low voltage or high voltage winding.
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86 views
1 answer
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Mar 19, 2018
by
anonymous

Last Answer : Sandwich type winding is used in 3 phase shell-type transformer.
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197 views
1 answer
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Mar 19, 2018
by
anonymous

Last 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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156 views
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Sep 30, 2017
by
anonymous

Describe the difference between an open circuit and a short circuit.
Last Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit
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Jun 29, 2019
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anonymous

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents
Last Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only
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Apr 29, 2018
by
anonymous

Which of the following are known as the short circuit parameters of a 2- port network? (A) Z- parameters. (B) H- parameters. (C) Y- parameters. (D) A,B,C,D, parameters.
Last Answer : Which of the following are known as the short circuit parameters of a 2- port network? (A) Z- parameters. (B) H- parameters. (C) Y- parameters. (D) A,B,C,D, parameters.
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90 views
1 answer
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Apr 28, 2018
by
anonymous

Last Answer : Short circuit test on transformers is conducted to determine copper losses.
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218 views
1 answer
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Mar 19, 2018
by
anonymous

What can cause a short circuit?
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63 views
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Mar 10, 2018
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anonymous

Last Answer : Reactance relay is preferred for phase fault on short transmission line.
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110 views
1 answer
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Mar 20, 2018
by
anonymous

Equivalent circuit of transformer
Last Answer : Equivalent Circuit Diagram of Transformer Referred to Primary: V1 -Primary Input voltage I1 - Input Current I0- Exciting current/ No load current Im- Magnetizing component ... equivalent of secondary terminal voltage ZL- Load impedance ZL ′- Primary equivalent of load impedance
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381 views
2 answers
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May 17, 2020
by
anonymous

An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V
Last Answer : An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V
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259 views
1 answer
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Jun 18, 2018
by
anonymous

During open circuit test of a transformer?
Last Answer : During open circuit test of a transformer primary is supplied rated voltage.
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110 views
1 answer
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Mar 19, 2018
by
anonymous

Last Answer : High Voltage side is open circuited.
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116 views
1 answer
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Sep 27, 2017
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anonymous

Last Answer : Primary side is low voltage side and secondary side is high voltage side.
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121 views
1 answer
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Sep 27, 2017
by
anonymous

Last Answer : 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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234 views
1 answer
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Mar 20, 2018
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anonymous

7 The main advantage of auto transformer over a two winding transformer is A. Hysteresis losses are reduced B. Saving in winding material C. Copper losses are negligible D. Eddy losses are totally ... voltage applied on primary side is low D. Full-load current is not supplied to the transformer
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21 views
0 answers
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Last Answer : It is the wire wound around a aluminium metal it is found commonly in transformers or motors
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106 views
1 answer
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Jul 27, 2019
by
anonymous

Damper winding in a synchronous motor
Last Answer : Damper winding in a synchronous motor Serves to start the motor.
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87 views
1 answer
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May 8, 2018
by
anonymous

A _________ is used to measure the stator % winding temperature of the generator. (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer
Last Answer : A Resistance thermometer is used to measure the stator % winding temperature of the generator.
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3.4k views
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May 8, 2018
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anonymous

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
Last Answer : 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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331 views
1 answer
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May 3, 2018
by
anonymous

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
Last Answer : 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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588 views
1 answer
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May 3, 2018
by
anonymous

Damper winding is provided in 3 phase synchronous motors to :
Last Answer : Damper winding is provided in 3 phase synchronous motors to : provide starting torque and prevent hunting
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93 views
1 answer
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Apr 29, 2018
by
anonymous

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 ... ) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper
Last 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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621 views
1 answer
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Apr 29, 2018
by
anonymous

Last Answer : Wave winding is composed of that even number which is exact multiple of poles + 2.
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Mar 21, 2018
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anonymous

Last Answer : Lap winding is composed of any even number of conductors.
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129 views
1 answer
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Mar 21, 2018
by
anonymous

Last Answer : In D.C. generators, lap winding is used for low voltage, high current.
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1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In the case of lap winding resultant pitch is difference of front and back pitches.
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122 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In case of D.C. machine winding, number of commutator segments is equal to number of armature coils.
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1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In lap winding, the number of brushes is always same as the number of poles.
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323 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : The resistance of armature winding depends on length of conductor, cross-sectional area of the conductor, number of conductors.
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212 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In D.C. machines fractional pitch winding is used to reduce the sparking.
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355 views
1 answer
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Mar 20, 2018
by
anonymous
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Last Answer : The starting winding of a single-phase motor is placed in stator.
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1 answer
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Mar 20, 2018
by
anonymous

Last Answer : Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.
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222 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.
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1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In split phase motor main winding is of thick wire placed at the bottom of the slots.
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83 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In A.C. series motor compensating winding is employed to reduce sparking at the brushes.
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145 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In split-phase motor auxiliary winding is of thin wire placed at the top of the slots.
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72 views
1 answer
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Mar 20, 2018
by
anonymous

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?
Last 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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116 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : 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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875 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.
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207 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : 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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710 views
1 answer
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Mar 20, 2018
by
anonymous
