Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 16, Problem 5R
To determine
Show the calculations on how to select a proper size box for problem 4 and find the kind of box that should be select.
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For the state space model, find the following:
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Q9 A single-phase transformer, 2500 / 250 V, 50 kVA, 50 Hz has the following parameters, the
Primary and secondary resistances are 0.8 ohm and 0.012 ohm respectively, the primary and
secondary reactance are 4 ohm and 0.04 ohm respectively and the transformer gives 96% maximum
efficiency at 75% full-load. The magnetizing component of-load current is 1.2 A on 2500 V side. 1-
Draw the equivalent circuit referred to primary (H.V side) and inserts all the values in it 2- Find out
Ammeter, voltmeter and wattmeter readings on open-circuit and short-circuit test. If supply is given
to 2500 V side in both cases. Ans. O.C. Test (Vo= 2500 V, lo=1.24 A, Wo=781.25 w) S.C. Test (Vsc
=164.924 V, Isc =20 A, Wsc =800 w )
Chapter 16 Solutions
Electrical Wiring Residential
Ch. 16 - Prob. 1RCh. 16 - What are the circuit ratings? __________________Ch. 16 - Prob. 3RCh. 16 - Prob. 4RCh. 16 - Prob. 5RCh. 16 - a. How many lights are recommended for a one-car...Ch. 16 - From how many points in the garage of this...Ch. 16 - GFCI breakers or GFCI receptacles are relatively...Ch. 16 - The total estimated volt-ampere load of the garage...Ch. 16 - Prob. 10R
Ch. 16 - Prob. 11RCh. 16 - Prob. 12RCh. 16 - In the spaces provided, fill in the cover (depth)...Ch. 16 - What section of the Code prohibits embedding Type...Ch. 16 - Using the suggested cable layout of the garage...Ch. 16 - When a box-cover unit is installed for an overhead...Ch. 16 - When outdoor receptacles are installed where a...Ch. 16 - In order to wire a post light, a homeowner...Ch. 16 - What concerns are there when installing a...
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- A modulating signal f(t) is bandlimited to 5.5 kHz is sampled at a rate of 15000 samples/sec. The samples are quantized into 1024 levels. Calculate transmission bandwidth if the following modulation types are used for signal transmission: 1-ASK, QAM 2-QPSK, 8-PSK 3-FSK, 8-FSK with Af = 20 kHzarrow_forwardQ10 The full-load copper loss on the H.V. side of 100KVA, 11000/317 V, single-phase transformer is 0.62 kw and on the L.V. side is 0.48 kW. i) Calculate R1, R2 in ohms ii) Find X1,X2,if the percentage equivalent reactance is 4%, and reactance is divided in same proportion as resistance. Ans, 27.30, 0.175), 0.00482 . (7.5)arrow_forwardFind the binary sequence, for the following Differential Manchester code.arrow_forward
- Q2- What are the parameters and loss that can be determined during open-circuit test of singlephase transformer. Draw the circuit diagram of open-circuit test and explain how can you calculate the Parameters and loss.arrow_forwardQ6- the open circuit and short circuit tests on a 10 KVA, 125/250 v, 50 Hz single phase transformer gave the following results: O.C. Test: 125 V,0.6 A, 50 W ( on L.V.) S.C. Test: 20 V, 40 A, 177.78 W (on H.V. side) Calculate: i) Copper losses on half load ii) Full load efficiency at 0.8 leading p.f. iii) Half load efficiency at 0.8 leading p.f. iv) Regulation at full load at 0.9 leading p.f. Ans: 44.445 W, 97.23%, 97.69%, -1.8015%arrow_forwardQ3-A two-winding transformer has a primary winding with 208 turns and a secondary winding with 6 turns. The primary winding is connected to a 4160V system. What is the secondary voltage at no load? What is the current in the primary winding with a 50-amp load connected to the secondary winding? What is the apparent power flowing in the primary and secondary circuits? Ans. 120 V, 1.44 A, 6000 VAarrow_forward
- Q12- A three phase transformer 3300/400 V,has D/Y connected and working on 50Hz. The line current on the primary side is 12A and secondary has a balanced load at 0.8 lagging p.f. Determine the i) Secondary phase voltage ii) Line current iii) Output power Ans. (230.95 V, 99.11 A, 54.94 kW)arrow_forwardQ1- A single phase transformer consumes 2 A on no load at p.f. 0.208 lagging. The turns ratio is 2/1 (step down). If the loads on the secondary is 25 A at a p.f. 0.866 lagging. Find the primary current and power factor.arrow_forwardQ7- A 5 KVA, 500/250 V,50 Hz, single phase transformer gave the following reading: O.C. Test: 250 V,2 A, 50 W (H.V. side open) S.C. Test: 25 V10 A, 60 W (L.V. side shorted) Determine: i) The efficiency on full load, 0.8 lagging p.f. ii) The voltage regulation on full load, 0.8 leading p.f. iii) Draw the equivalent circuit referred to primary and insert all the values it.arrow_forward
- Q4- A single phase transformer has 350 primary and secondary 1050 turns. The primary is connected to 400 V,50 Hz a.c. supply. If the net cross sectional area of core is 50 cm2, calculate i) The maximum value of the flux density in the core. ii) The induced e.m.f in the secondary winding. Ans: 1.029 T, 1200Varrow_forwardpower systems engineeringarrow_forwardpower systemsarrow_forward
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