The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above
Last Answer : The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA
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asked
May 8, 2018
by
anonymous
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55 When a 400Hz transformer is operated at 50Hz its KVA rating is A. Reduced to 1/8 B. Increased 8 times C. Unaffected D. Increased 64 times
Last Answer : A. Reduced to 1/8
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34 views
1 answer

4] In operating a 400hz transformer at 50Hz A. Only voltage is reduced in the same proportion as the frequency B. Only KVA rating is reduced in the same proportion as the frequency C. Both voltage and KVA rating are reduced in the same proportion as frequency D. None of the above
Last Answer : B. Only KVA rating is reduced in the same proportion as the frequency
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10 views
1 answer

Why Transformer rating is given in kVA?
Last Answer : Because of core losses and iron losses as core losses are measured in amps and cu losses in voltage ....this is definatly reason for the rating Or kVA is the unit for apparent power. Apparent ... shift between voltage and current). So a transformer has to be rated (and selected) by apparent power.
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2.8k views
6 answers
asked
Aug 12, 2018
by
anonymous

Define kVA rating of transformer.
Last Answer : kVA rating of transformer is defined as the product of voltage (V) and current (I) on primary side of transformer or secondary side of transformer divided by 1000. On both side the VA rating remains ... Mathematically kVA rating is given by, kVA rating of transformer = V1I1/1000 =V2I2/1000
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158 views
1 answer
asked
Aug 12, 2018
by
anonymous

Can Transformers be Reconnected as Autotransformers to Increase Their KVA Rating?
Last Answer : ANSWER: Several of standard single phase transformers can be connected as autotransformers. The KVA capacity will be greatly increased when used as an Autotransformer, in comparison to the ... This voltage is normally used for operating fluorescent lamps or similar devices requiring 277 volts
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6 views
1 answer

47 Cross over windings are used in A. Low voltage side of high kVA rating transformers B. Current transformers C. High voltage side of high kVA rating transformers D. High voltage side of low kVA rating transformers
Last Answer : D. High voltage side of low kVA rating transformers
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1 answer

4 Helical coils can be used on A. Low voltage side of high kVA transformers B. High frequency transformers C. High voltage side of small capacity transformers D. High voltage side of high kVA rating transformers
Last Answer : A) low voltage side of high KVA transformer
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13 views
1 answer

The transformer ratings are usually expressed in terms of A. Volts B. Amperes C. kW D. kVA
Last Answer : D) KVA
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116 views
1 answer

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is
Last Answer : A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707
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784 views
1 answer
asked
May 8, 2018
by
anonymous

A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u. The actual value of x1 referred to the low voltage side is (A) 0.85 Ω (B) 3.63 Ω (C) 36.3 Ω (D) 252 Ω
Last Answer : A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u. The actual value of x1 referred to the low voltage side is 3.63 Ω
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290 views
1 answer
asked
Apr 28, 2018
by
anonymous

The rating of transformer may be expressed in ____________. (A) kVAR (B) kW (C) kVA (D) Horse power
Last Answer : The rating of transformer may be expressed in kVA .
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618 views
1 answer
asked
May 8, 2018
by
anonymous

What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23
Last Answer : What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23
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2.7k views
1 answer
asked
May 13, 2018
by
anonymous

The kVA rating required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV will be: A. 4 kVA B. 0.25 kVA C. 16 kVA D. 8 kVA
Last Answer : The kVA rating required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV will be: 16 kVA
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134 views
1 answer
asked
Apr 12, 2018
by
anonymous
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Last Answer : Iron loss of a transformer can be measured by low power factor wattmeter.
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104 views
1 answer
asked
Mar 19, 2018
by
anonymous

why transformers are rated in kVA ?
Last Answer : A:Copper loss of a transformer depends on current and iron loss on voltage . Hence total losses depends on Volt- Ampere and not on the power factor. That is why the rating of transformers are in kVA and not in kW.
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6 views
1 answer

[75] Two transformers are connected in parallel. These transformers do not have equal percentage impedance which results A. Short-circuiting of the secondaries B. Power factor of one of the ... have negligible core losses D. Loading of the transformers not in proportion to their kVA ratings.
Last Answer : D. Loading of the transformers not in proportion to their kVA ratings
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24 views
1 answer

When two transformer of different kVA rating are connected in parallel they share the load in proportion to their respective kVA rating only when their:
Last Answer : When two transformer of different kVA rating are connected in parallel they share the load in proportion to their respective kVA rating only when their: P u impedance are equal
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473 views
1 answer
asked
May 22, 2018
by
anonymous

Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
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115 views
0 answers
asked
Apr 27, 2020
by
anonymous

What is the back E.M.F in Transformer ?
Last Answer : Back emf in transformer is when apply voltage in primary side of transformer. This voltage produce flux according to Faraday law electro magnetic induction. This flux called mutual flux and this ... secondary flux oppos the applied voltage according to lenz law. its called back emf of transformer
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150 views
1 answer
asked
Aug 27, 2019
by
anonymous


transformer coupled amplifier
Last Answer : transformer coupled amplifier
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94 views
1 answer
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Aug 19, 2019
by
anonymous

72 views
0 answers
asked
Jun 29, 2019
by
anonymous

Transformer efficiency
Last Answer : Transformer efficiency
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78 views
1 answer
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Jun 11, 2019
by
anonymous

Give Any Three Features And Any Two Applications Of Welding Transformer.
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
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238 views
2 answers
asked
Sep 15, 2018
by
anonymous

Explain construction and working of isolation transformer.
Last Answer : Isolation Transformer https://youtu.be/gq9kjLlhPN0
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918 views
3 answers
asked
Sep 14, 2018
by
anonymous

Write selection criteria of distribution transformer with any four points.
Last Answer : Selection Criteria for Distribution Transformer: i) Ratings - The kVA ratings should comply with IS:2026 ( Part l )-1977*. The noload secondary voltage should be 433 volts for transformers to be ... is not necessary. vi) Cooling - The transformers covered in this group are generally ONAN, AN
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235 views
2 answers
asked
Sep 14, 2018
by
anonymous

Write any four advantages of instrument transformer.
Last Answer : Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.
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186 views
1 answer
asked
Sep 6, 2018
by
anonymous

State the advantages of instrument transformer in using for extension of range of meters.
Last Answer : Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.
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74 views
1 answer
asked
Sep 6, 2018
by
anonymous

Compare RC coupled, transformer coupled and direct coupled amplifier based on four points.
Last Answer : Parameter RC coupled Transformer coupled Direct coupled Coupling element Resistor and capacitor Transformer No element Impedance matching Poor Excellent good Frequency ... Low frequency amplifier,opamp Size and cost small Large and bulky least
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3.0k views
1 answer
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Sep 5, 2018
by
anonymous

Introduction to transformer
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed ... power start transformer, autotransformer, multiphase transformer, magnetic flux linkage transformer, resonant transformer etc.
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69 views
1 answer
asked
Sep 1, 2018
by
anonymous
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MATLAB design code and model description.
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76 views
0 answers

Cylindrical type transformer has: (A) Single magnetic circuit (B) Double magnetic circuit (C) All of the above (D) None of the above
Last Answer : Cylindrical type transformer has: Single magnetic circuit
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122 views
1 answer
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May 8, 2018
by
anonymous

The transformer works on the principle of: (A) Mutual induction (B) Mutual capacitance (C) All of the above (D) None of the above
Last Answer : The transformer works on the principle of: Mutual induction
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100 views
1 answer
asked
May 8, 2018
by
anonymous

Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines: (A) Delta-Star (B) Star-Delta (C) Delta-Delta (D) Star-Star
Last Answer : Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines: Star-Star
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357 views
1 answer
asked
May 8, 2018
by
anonymous

Which of the following does not change in a transformer? (A) Current (B) Voltage (C) Frequency (D) All of the above
Last Answer : Which of the following does not change in a transformer? (A) Current (B) Voltage (C) Frequency (D) All of the above
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2.3k views
1 answer
asked
May 8, 2018
by
anonymous

A Step Up transformer : (A) Steps up the level of Voltage (B) Steps down the level of current (C) Step up the level of Frequency (D) (a) and (b) only
Last Answer : A Step Up transformer : (A) Steps up the level of Voltage (B) Steps down the level of current (C) Step up the level of Frequency (D) (a) and (b) only
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66 views
1 answer
asked
May 8, 2018
by
anonymous

Increasing the number of turns of wire on the secondary of a transformer will (A) Decrease the secondary current (B) Increase the primary current (C) Have no effect on the secondary current (D) Increase the secondary current
Last Answer : Increasing the number of turns of wire on the secondary of a transformer will Decrease the secondary current
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1.3k views
1 answer
asked
May 8, 2018
by
anonymous

Step-down transformer converts high voltage and low current into: (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above
Last Answer : Step-down transformer converts high voltage and low current into: Low voltage and high current
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126 views
1 answer
asked
May 8, 2018
by
anonymous

Transformer has __________________ . (A) Primary winding and secondary winding (B) Primary winding and Auxiliary winding (C) Auxiliary winding and secondary winding (D) None of the above
Last Answer : Transformer has Primary winding and secondary winding.
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63 views
1 answer
asked
May 8, 2018
by
anonymous

What will happen if the primary of a transformer is connected to D.C. supply? (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn
Last Answer : What will happen if the primary of a transformer is connected to D.C. supply? (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn
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547 views
1 answer
asked
May 8, 2018
by
anonymous

What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be ... Current will be too much high (C) Transformer may start to smoke and burn (D) No effect
Last Answer : What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be ... will be too much high (C) Transformer may start to smoke and burn (D) No effect
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797 views
1 answer
asked
May 8, 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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227 views
1 answer
asked
May 8, 2018
by
anonymous

A transformer operates 24 hours day at full -load. It's full -load efficiency is : (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency
Last Answer : A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency
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268 views
1 answer
asked
Apr 30, 2018
by
anonymous

At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W
Last Answer : At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : 6000 W
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306 views
1 answer
asked
Apr 30, 2018
by
anonymous

What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... in power systems to step down extra high voltage signals and provide low voltage D) None of these
Last Answer : What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... power systems to step down extra high voltage signals and provide low voltage D) None of these
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100 views
1 answer
asked
Apr 29, 2018
by
anonymous

Which of the following is true with an auto transformer? A) It has only one winding B) It has two separate windings namely primary winding and secondary winding C) It has two primary windings and one single secondary winding D) None of these
Last Answer : A it has only one winding.
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531 views
2 answers
asked
Apr 29, 2018
by
anonymous
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A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are (A) 140 W (B) 180 W (C) 240 W (D) 480 W
Last Answer : A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are 240 W
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96 views
1 answer
asked
Apr 28, 2018
by
anonymous
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A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is (A) 216 V (B) 226 V (C) 234 V (D) 236 V
Last Answer : A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is 226 V
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142 views
1 answer
asked
Apr 28, 2018
by
anonymous

The main purpose of using core in a transformer is to (A) decrease iron losses (B) eliminate magnetic hysteresis (C) reduce reluctance of the common magnetic circuit (D) prevent eddy current loss
Last Answer : Reduce Relucatnce of the common magnetic circuit.
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2.0k views
2 answers
asked
Apr 28, 2018
by
anonymous
