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27. Two Tungar tubes are connected to a center-tapped transformer secondary for full-wave rectification and deliver a load current of 16 amp at 12.4 volts. (a) Draw a circuit diagram for the problem. Calculate: (b) the effective current in each half of the transformer secondary; (c) the voltage rating of the transformer secondary, assuming a tube drop of 12 volts.

27. Two Tungar tubes are connected to a center-tapped transformer secondary for full-wave rectification and deliver a load current of 16 amp at 12.4 volts. (a) Draw a circuit diagram for the problem. Calculate: (b) the effective current in each half of the transformer secondary; (c) the voltage rating of the transformer secondary, assuming a tube drop of 12 volts.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Number 27 please, thank you.
CONVERTERS AND RECTIFIERS 543 26. An a-c ammeter (iron-vane type) registers 8.4 amp when placed in the load circuit of a half-wave Rectigon rectifier. What will be the deflection on a d-e ammeter (D'Arsonval type) when placed in the same circuit? 27. Two Tungar tubes are connected to a center-tapped transformer secondary for full-wave rectification and deliver a load current of 16 amp at 12.4 volts. (a) Draw a circuit diagram for the problem. Calculate: (b) the effective current in each half of the transformer secondary; (c) the voltage rating of the transformer secondary, assuming a tube drop of 12 volts. 28. A half-wave Rectigon rectifier delivers a d-c load of 10 amp at 20 volts. If the primary and secondary voltages of the transformer are, respectively, 115 and 62, calculate: (a) the tube drop; (b) the primary current, neglecting the exciting current. 29. Assuming a rectangular wave form, calculate the effective anode current in a two-1ode mercury-arc rectifier for a d-c load of 50 amp. 80. A two-anode mercury-arc rectifier has an arc drop of 15 volts and delivers a d-c load at 120 volts. Calculate the maximum potential difference between cathode and anode. 31. Assuming rectangular wave forms, compute the effective anode currents for the following d-c loads in the given multianode mercury-arc rectifiers: (a) 75 kw, 230 volts, three anodes; (b) 1,500 kw, 1,200 volts, six anodes; (c) 5,000 kw, 2,400 volts, 12 anodes. 82. A two-anode mercury-arc rectifier delivers a load of 5.98 kw at 115 volts. If the primary of the transformer is connected to a 4,600-volt source, the tube drop is 15 volts, and a rectangular waveshape is assumed for the anode current, calcu- late: (a) the anode current; (b) the voltage rating of each of the transformer secondary windings; (e) the primary eurrent, neglecting the exciting current; (d) the kilovolt-ampere rating of the transformer primary; (e) the kilovolt- ampere rating of the transformer secondary. 5 38. A three-anode mercury-arc rectifier supplies a 250-kw 230-volt load and is energized from a 4,600-volt three-phase source through a three-phase transformer whose primaries are in delta. Assuming an arc drop of 20 volts, caleulate: (a) the d-c load current; (b) the voltage and kilovolt-ampere rating of each trans- former secondary; (c) the current and kilovolt-ampere rating of the three-phase A transformer. 34. A six-anode mercury-arc rectifier is served by & three-phase transformer having a rating of 5,000 kva and 13,800/930-1,860 volts. Assuming a 25-volt arc drop, calculate: (a) the d-e load voltage, current, and power; (b) the anode current.
Transcribed Image Text:CONVERTERS AND RECTIFIERS 543 26. An a-c ammeter (iron-vane type) registers 8.4 amp when placed in the load circuit of a half-wave Rectigon rectifier. What will be the deflection on a d-e ammeter (D'Arsonval type) when placed in the same circuit? 27. Two Tungar tubes are connected to a center-tapped transformer secondary for full-wave rectification and deliver a load current of 16 amp at 12.4 volts. (a) Draw a circuit diagram for the problem. Calculate: (b) the effective current in each half of the transformer secondary; (c) the voltage rating of the transformer secondary, assuming a tube drop of 12 volts. 28. A half-wave Rectigon rectifier delivers a d-c load of 10 amp at 20 volts. If the primary and secondary voltages of the transformer are, respectively, 115 and 62, calculate: (a) the tube drop; (b) the primary current, neglecting the exciting current. 29. Assuming a rectangular wave form, calculate the effective anode current in a two-1ode mercury-arc rectifier for a d-c load of 50 amp. 80. A two-anode mercury-arc rectifier has an arc drop of 15 volts and delivers a d-c load at 120 volts. Calculate the maximum potential difference between cathode and anode. 31. Assuming rectangular wave forms, compute the effective anode currents for the following d-c loads in the given multianode mercury-arc rectifiers: (a) 75 kw, 230 volts, three anodes; (b) 1,500 kw, 1,200 volts, six anodes; (c) 5,000 kw, 2,400 volts, 12 anodes. 82. A two-anode mercury-arc rectifier delivers a load of 5.98 kw at 115 volts. If the primary of the transformer is connected to a 4,600-volt source, the tube drop is 15 volts, and a rectangular waveshape is assumed for the anode current, calcu- late: (a) the anode current; (b) the voltage rating of each of the transformer secondary windings; (e) the primary eurrent, neglecting the exciting current; (d) the kilovolt-ampere rating of the transformer primary; (e) the kilovolt- ampere rating of the transformer secondary. 5 38. A three-anode mercury-arc rectifier supplies a 250-kw 230-volt load and is energized from a 4,600-volt three-phase source through a three-phase transformer whose primaries are in delta. Assuming an arc drop of 20 volts, caleulate: (a) the d-c load current; (b) the voltage and kilovolt-ampere rating of each trans- former secondary; (c) the current and kilovolt-ampere rating of the three-phase A transformer. 34. A six-anode mercury-arc rectifier is served by & three-phase transformer having a rating of 5,000 kva and 13,800/930-1,860 volts. Assuming a 25-volt arc drop, calculate: (a) the d-e load voltage, current, and power; (b) the anode current.
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