Answered: Voltage between 1 kV and 50 kV is…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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1. Voltage between 1 kV and 50 kV is defined as:

A.Very High Voltage

B.Medium Voltage

C.Low Voltage

D.High Voltage

A factory consumes 400, 000 kVAh in a year witth the yearly average power factor 0.75. Calculate the average demand and percentage of annual load factor if the maximum demand is 120kW.

A.Average demand = 44.25kW, Load factor = 29%

B.Average demand = 44.25kW, Load factor = 39%

C.Average demand = 34.25kW, Load factor = 29%

D.Average demand = 34.25kW, Load factor = 39%

The example of low voltage system is:

A.Three-phase, 4-wire, 415 V, up to 45 kVA maximum demand

B.Three-phase, 3-wire, 66 kV, 132 kV and 275 kV for exceptionally large load of 25 MVA maximum demand

C.Three-phase, 3-wire, 11 kV for load of 1000 kVA maximum demand and above

D.Three-phase, 3-wire, 22 kV or 33 kV for load of 5000 kVA maximum demand and above

A load rises from zero to 20 kW instantaneosly and stays constant for 2 minutes, then rises about 40 kW and remains constant for 1 minute, then rises again about 20 kW for 2 minutes before instantly falls to zero for 1 minute. If the load continues to vary in these steps, calculate the average demand over the 20 minutes demand interval.

A.52 kW

B.48 W

C.48 kW

D.52 W

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