Please Log in or Register for more.

If a transformer is switched on to a voltage more than the rated voltage?

97 views

1 Answer

Answer :

If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.

Like 0 like

Please log in or register to answer this question.

Related Questions


In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
Last Answer : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

Show More

152 views 1 answer







A good voltage regulation of a transformer means?
Last Answer : A good voltage regulation of a transformer means output voltage fluctuation from no load to full load is least.

Show More

98 views 1 answer







The voltage transformation ratio of a transformer is equal to the ratio of?
Last Answer : The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.

Show More

166 views 1 answer







The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?
Last Answer : The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

Show More

302 views 1 answer







The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

Show More

106 views 0 answers







In a lamp load when more than one lamp are switched on the total resistance of the load?
Last Answer : In a lamp load when more than one lamp are switched on the total resistance of the load decreases.

Show More

311 views 1 answer







Sparking occurs when a load is switched off because the circuit has high?
Last Answer : Sparking occurs when a load is switched off because the circuit has high inductance.

Show More

124 views 1 answer







A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?
Last Answer : A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

Show More

232 views 1 answer








Last Answer : Generating capacity connected to the bus bars and ready to take load when switched on is known as spinning reserve.

Show More

177 views 1 answer







Thyristor Switched Capacitor (TSC)
Last Answer : Thyristor Switched Capacitor (TSC)  TSC is a static compensator. TSC is use for compensating reactive power. Compensation is required for voltage regulation, increasing stability, ... compensating device like TCS phase angle between voltage and current can be maintain.

Show More

202 views 1 answer














Last Answer : When a given transformer is run at its rated voltage but reduced frequency, its core flux density is increased.

Show More

110 views 1 answer







A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be
Last Answer : A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V

Show More

483 views 1 answer







A 50 Hz, 4 pole turboalternator rated at 20 MVA. 13.2 KV has an inertia constant H = 4 KW sec/KVA. The K.E. stored in the rotor at synchronous speed is
Last Answer : A 50 Hz, 4 pole turboalternator rated at 20 MVA. 13.2 KV has an inertia constant H = 4 KW sec/KVA. The K.E. stored in the rotor at synchronous speed is 80 MJ

Show More

1.5k views 1 answer







Capacitors for power factor correction are rated in?
Last Answer : Capacitors for power factor correction are rated in kVAR.

Show More

84 views 1 answer








Last Answer : A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to r.m.s. voltage.

Show More

319 views 1 answer








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.

Show More

157 views 1 answer







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

Show More

125 views 1 answer







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

Show More

199 views 1 answer







A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging
Last Answer : 0

Show More

5.1k views 3 answers







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

Show More

99 views 1 answer







What is impulse voltage of transformer?

Show More

73 views 0 answers







The inrush current of a transformer at no load is maximum if the supply voltage is switched on  (1) at peak voltage value (2) at zero voltage value (3) at half voltage value (4) at 0.866 time voltage value
Last Answer : At 0.866 time voltage value

Show More

114 views 2 answers







State and justify which of the following two transformers is better:  Transformer A = 4% voltage regulation  Transformer B = 6% voltage regulation
Last Answer : Transformer A with 4% voltage regulation is better.  Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

Show More

181 views 1 answer








Last Answer : A transformer cannot raise or lower the voltage of a D.C. supply because Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero.

Show More

351 views 1 answer








Last Answer : The no load current in a transformer lags behind the applied voltage by an angle of about 75°.

Show More

188 views 1 answer







Why the open circuit test on a transformer is conducted at rated voltage?
Last Answer : A:The open circuit on a transformer is conducted at a rated voltage because core loss depends upon the voltage. This open circuit test gives only core loss or iron loss of the transformer.

Show More

4 views 1 answer







Negative voltage regulation is indicative that the load is?
Last Answer : Negative voltage regulation is indicative that the load is capacitive.

Show More

236 views 1 answer







For given applied voltage, with the increase in frequency of the applied voltage?
Last Answer : For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.

Show More

238 views 1 answer







Minimum voltage regulation occurs when the power factor of the load is?
Last Answer : Minimum voltage regulation occurs when the power factor of the load is leading.

Show More

224 views 1 answer







State why a transformer always have an efficiency of more than 90%.
Last Answer : As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.

Show More

279 views 1 answer








Last Answer : In the transformer low voltage winding has got more cross-sectional area.

Show More

256 views 1 answer








Last Answer : High voltage winding in a transformer has more number of turns.

Show More

363 views 1 answer







Explain the effect of Harmonics on the Transformer.
Last Answer : Effect of Harmonics on the Transformer:  1. Core loss: Harmonic voltage increases the hysteresis and eddy current losses in the lamination. The amount of the core loss depends on ... small core vibrations.  5. Saturation problem: Sometimes additional harmonic voltage causes core saturation.

Show More

130 views 1 answer







List two special feature of welding transformer.
Last Answer : Special features of welding transformer: i) It is a step down transformer that reduces the source voltage to a voltage desired according to the demands of the welding process. ii) Having large primary turns and less ... V ii) Secondary voltage - 40 to 60 V iii) Secondary current - 200 to 600 A

Show More

153 views 1 answer







State two applications of isolation transformer
Last Answer : Applications of isolation transformer: i) Isolates the load equipment from supply ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device. iv) Protects loads from harmonic distortion.

Show More

54 views 1 answer







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

Show More

381 views 2 answers







Single phase transformer
Last Answer : Single phase Transformer Transformer

Show More

261 views 1 answer







What is the use of transformer?
Last Answer : The use of transformer  is to do lower or raise  the voltage or currents in an electrical  circuit.  That's quite so simple. 

Show More

160 views 1 answer







Write about transformer on DC.
Last Answer : Transformer on DC : Transformer cannot work on DC. Transformer works on electromagnetic induction principle. Electromagnetic induction principle means when flux linking with coil changes and EMF induced in it ... winding insulation will burn. https://youtu.be/TVp_0fIfxqY

Show More

248 views 1 answer













State any four characteristics of core type transformer.
Last Answer : Characteristics of core type transformer: i) It has one window. ii) It has one magnetic circuit. iii) Core surrounds the winding. iv) Average length of core is more. v) Area of cross ... Better cooling for winding. vii) Mechnical strength is comparatively less. viii) Repair and maintenance is easy.

Show More

132 views 1 answer







Explain construction and working of single phase Auto transformer.
Last Answer : Construction of single phase auto transformer: (i) It has only one winding wound on a laminated circular magnetic core. (ii) The core is made of silicon steel stampings. (iii) The two terminals of the ... help of handle. 5) The same transformer can be used as step-up or step down auto-transformer

Show More

347 views 1 answer








Last Answer : No-load current in a transformer lags behind the voltage by about 75°.

Show More

90 views 1 answer








Last Answer : The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

Show More

205 views 1 answer








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

Show More

86 views 1 answer








Last Answer : The efficiency of a power transformer is of the order of 98 percent.

Show More

100 views 1 answer








Last Answer : In a transformer, routine efficiency depends upon load current and power factor of load.

Show More

133 views 1 answer








Last Answer : The maximum efficiency of a distribution transformer is at 50% full load.

Show More

141 views 1 answer








Last Answer : Transformer breaths in when load on it decreases.

Show More

90 views 1 answer






Show More⇦ PreviousNext ⇨