Recent questions tagged voltages

Description : The coil of a transformer that is energized from a source of alternating voltage is known as the: A. low voltage winding B. high voltage winding C. primary winding D. secondary winding

Last Answer : C

Description : There is a single-phase motor connected in parallel with an electric heater unit. If the heater is switched off, then the overall power factor angle of the circuit will: A. increase B. decrease C. stay the same D. none of the above

Last Answer : A

Description : Instantaneous Voltages

Last Answer : Instantaneous value: The value of an alternating quantity at a particular instant is called the instantaneous value of the quantity at that instant.  Maximum Value: The maximum or peak value ... an alternating quantity during a cycle is called the maximum value or amplitude of the quantity.

Description : Sinusoidal Steady-State Analysis - Using nodal analysis, find node voltages in the circuit.

Last Answer : Sinusoidal Steady-State Analysis - Using nodal analysis, find node voltages in the circuit.

Description : Alternating voltages and phasors (Problem 15)

Last Answer : Alternating voltages and phasors (Problem 15)

Description : Alternating voltages and phasors (Problem 14)

Last Answer : Alternating voltages and phasors (Problem 14)

Description : Alternating voltages and phasors (Problem 13)

Last Answer : Alternating voltages and phasors (Problem 13)

Description : Alternating voltages and phasors (Problem 12)

Last Answer : Alternating voltages and phasors (Problem 12)

Description : Alternating voltages and phasors (Problem 11)

Last Answer : Alternating voltages and phasors (Problem 11)

Description : Alternating voltages and phasors (Problem 10)

Last Answer : Alternating voltages and phasors (Problem 10)

Description : Alternating voltages and phasors (Problem 9)

Last Answer : Alternating voltages and phasors (Problem 9)

Description : Alternating voltages and phasors (Problem 8)

Last Answer : Alternating voltages and phasors (Problem 8)

Description : Alternating voltages and phasors (Problem 7)

Last Answer : Alternating voltages and phasors (Problem 7)

Description : Alternating voltages and phasors (Problem 6)

Last Answer : Alternating voltages and phasors (Problem 6)

Description : Alternating voltages and phasors (Problem 5)

Last Answer : Alternating voltages and phasors (Problem 5)

Description : Alternating voltages and phasors (Problem 4)

Last Answer : Alternating voltages and phasors (Problem 4)

Description : Alternating voltages and phasors phasor addition and division (Problem 3)

Last Answer : Alternating voltages and phasors phasor addition and division (Problem 3)

Description : Alternating voltages and phasors : phasor addition (Problem 2)

Last Answer : Alternating voltages and phasors : phasor addition (Problem 2)

Description : Alternating voltages and phasors (Problem 1)

Last Answer : Alternating voltages and phasors (Problem 1)

Description : Thyristor can be protected from over voltages by using

Last Answer : Thyristor can be protected from over voltages by using Voltage clamping device

Description : A minimum clearance of 6.3 m to ground is required for overhead lines when operating voltages are :  (A) less than 66 kV (B) lie between 66 kV and 110 kV (C) more than 165 kV (D) lie between 110 kV and 165 kV

Last Answer : A minimum clearance of 6.3 m to ground is required for overhead lines when operating voltages are : lie between 66 kV and 110 kV

Description : The voltages across various discs of suspension insulators having identical discs are different due to:  (A) Surface leakage currents  (B) Series capacitance of lines  (C) Shunt capacitance to ground  (D) Series and shunt capacitances

Last Answer : The voltages across various discs of suspension insulators having identical discs are different due to: Shunt capacitance to ground 

Description : The sending end and receiving end voltages of a three-phase transmission line are 10 kV/ph and 9.5 kV/ph, respectively. If the resistance drop is 150 V/ph and receiving end power factor is 0.8, the sending end power factor is (A) 0.745 lagging (B) 0.775 lagging (C) 0.8 lagging (D) 0.85 lagging

Last Answer : Vscos¢s-Vrcos¢r=IR

Last Answer : For cost and safety, the outdoor substations are installed for voltages above 33 kV.

Description : Why transmission voltages are high?

Last Answer : If current is high then I2R losses will be more .If I2R losses is more then heat generated is more. By heat or increasing temperature resistance will also be increase which will decrease ... voltage we are decreasing current which is advantageous. That's why transmission voltages is high.