You wish to increase the capacity of an ammeter to measure 4A instead of itsquarter scale deflection of 0.5mA. If the internal resistance of the permanentmagnet moving coil meter is 40 Ohms.a. Draw the circuit diagram to show what is needed to achieve this purpose? |b. Calculate the value of the resistance that is needed.c. Calculate the voltage of the meter

PMMC(Permanent Magnet Moving Coil)- It is made of (Al+Ni+Co) an alloy material. Its magnetic field…

Answered: You wish to increase the capacity of an…

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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An office has a following dimensions : length = 20 m. width = 10 m. 1.) Ceiling to desk height is 2 m. 2.) Area to be illuminated to a general is 250 lux using twin lamp 32 watt CFLLuminaire with a SHR of 1.25. 3.) Each lamp has an initial output of 85 lumen per watt. 4.) Maintenance factor is 0.63, Utilisation factor is 0.69 Design a lighting system for this office by computing the following : 1. ROOM INDEX 2. INITIAL BARE LAMP FLUX
1. Design a circuit for each of these acts that adheres to the particular given requirements. (Label all components, including voltage source) Materials: 1 Power source (Battery pack – 4.5 V) Bag of wires 1 Single-throw switch 1 Double-throw switch 5 light bulbs 2 green, 1 red, 1 yellow mini-ziploc baggies - When the single switch is thrown (closed), Lead Singer, Backup Singer 1, and Backup Singer 2’s lights are ALL turned on. - In the middle of the performance, Backup Singer 1’s light unfortunately goes out, and only the Lead Singer remains lit. - If power is cut to the Lead Singer’s light, make sure that both Backup Singers remain lit.
A lecture room with an area of 50 square meters (5m at the shortest side) accommodates 45 students. The room is being utilized at 7:30am to 7:30 pm from monday to wednesday for 18 weeks( 1 semester). The fixture has a 0.35 coefficient of utilization and maintenance factor of 0.80. A. Compute for the illumination
It is required to produce an illumination of 100 lux in a factory hall 30 m by 15 m. Assume that the maintenance factor is 0.8, coefficient of utilization is 0.4 and efficiency of lamp is 14 lm/W. Suggest the suitable rating, the number of lamps and their possible arrangement. The sizes of the lamps available are 100, 250, 400 and 500 W. [40 lamps of 250 W in 5 rows]
Moving iron meters are cheapest form of meter available in the market. Select one: True False
Companies designs, creates, and sells Integrated Circuits (chips). What do your buyers useto compare your IC products against your competition’s? Give 3 types of IC benchmarkmeasurements in short answer
A room 8 m x 12 m is to be lighted by 18 lamps to a fairly uniform illumination of 100 lux. The maintenance factor is 0.80. If the lumen output of each lamp is 1,600, calculate the coefficient of utilization. Show detailed solution
A small supermarket 20 m long by 15 m wide is to be illuminated to a level of 600 lx by 2400 mm 125 W fluorescent lamps having an efficacy of 65 lm/W. The maintenance factor is 0.85 and the coefficient of utilization is 0.6. Calculate the number of fittings required and show their positions on a scale plan. Calculate the total current taken by the lighting.
A lecture room with an area of 50 square meters (5m at the shortest side) accommodates 45 students. The room is being utilized at 7:30am to 7:30 pm from monday to wednesday for 18 weeks( 1 semester). The fixture has a 0.35 coefficient of utilization and maintenance factor of 0.80. B. Compute for the illumination.
Design 7-step Voltmeter and 3-step Ammeter using galvanometer as integrated.
A voltmeter having sensitivity of 200 ohm/volt reads 119 V on its scale of 219 V when connected across an unknown resistance in series with a multimeter. When the multimeter rads 5mA, calculate the error due to the loading effect of voltmeter. Also calculate the error if the milliammeter reads 800mA and voltmeter reads 40V on its 219 V scale.
An energy service company agreed to convert all 18 constant volume air-handling units (AHUs) within a commercial building into variable-air-volume systems by installing variable frequency drives (VFDs) and VAV terminal boxes. To verify fan energy savings, it was agreed to meter only two AHU. Metering all 18 AHUs was determined to be economically infeasible. The metering of AHUs revealed the following: (a) the supply fan 1 is rated at kW(e,fan1) =40 kW and is operated for 5,800 hours/year, and (b) the supply fan 2 is rated at kW(e,fan2) =38 kW and is operated for 6,100 hours/year, and (c) the VFD operates according to the following load profile: % of Speed Fan 1, hours Fan2, hours 100 350 480 90 485 750 80 1080 980 70 1350 1240 60 1940 2010 50 210 320 40 265 210 30 120 110 It was agreed that the energy use of one motor is proportional to its speed squared. Determine the fan energy and cost savings for the CV to VAV conversion for all the AHUs as…

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