Recent questions tagged single-phase

1 answer 70 views

A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 25 views

When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 26 views

An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 20 views

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 57 views

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 24 views

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V

asked Apr 28, 2018 in Power Electronics by Shimroz123
1 answer 38 views

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses

asked Apr 28, 2018 in Power Electronics by Shimroz123
1 answer 283 views

The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 23 views

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in the same direction (C) the flux increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 41 views

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

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

In a single-phase transformer, the magnetizing current is (A) in phase with the no-load current (B) in quadrature with the no-load current (C) the product of no-load current and power factor (D) in phase with the flux in the core

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
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