EBK ELECTRICAL MOTOR CONTROLS FOR INTEG
5th Edition
ISBN: 8220101434760
Author: ROCKIS
Publisher: ATP
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Chapter 6.7, Problem 1CP
To determine
To explain: Whether NO or NC contacts are used to control the heating contractor, when the temperature switch is used in a heating system.
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Suppose a random variable X as pmf
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Px (x) = { %, x = 1, 2, 3,
0, otherwise.
find constand c
①P(X = 1), P(X 7,2), PC1 3)
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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 6 Solutions
EBK ELECTRICAL MOTOR CONTROLS FOR INTEG
Ch. 6.1 - Prob. 1CPCh. 6.1 - Prob. 2CPCh. 6.1 - Prob. 3CPCh. 6.1 - Prob. 4CPCh. 6.2 - Prob. 1CPCh. 6.2 - Prob. 2CPCh. 6.2 - Prob. 3CPCh. 6.2 - Prob. 4CPCh. 6.3 - Prob. 1CPCh. 6.3 - Prob. 2CP
Ch. 6.4 - Prob. 1CPCh. 6.4 - Prob. 2CPCh. 6.4 - Prob. 3CPCh. 6.4 - Prob. 4CPCh. 6.5 - Prob. 1CPCh. 6.5 - Prob. 2CPCh. 6.6 - Prob. 1CPCh. 6.6 - Prob. 2CPCh. 6.7 - Prob. 1CPCh. 6.7 - Prob. 2CPCh. 6.8 - Prob. 1CPCh. 6.8 - Prob. 2CPCh. 6.9 - Prob. 1CPCh. 6.9 - Prob. 2CPCh. 6.10 - Prob. 1CPCh. 6.10 - Prob. 2CPCh. 6.10 - Prob. 3CPCh. 6.10 - Prob. 4CP
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- Q2-A)- Enumerate the various losses in transformer. Explain how each loss varies with (Load current, supply voltage). B)- Draw the pharos diagram at load on primary side.arrow_forwardQ2- 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_forwardQ2-Drive the condition of maximum efficiency of single-phase transformer. Q1- 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) Draw the equivalent circuit referred to primary and insert all the values it.arrow_forward
- Q2- Describe various losses in transformer. Explain how each loss varies with load current, supply voltagearrow_forwardQ1-A 12 KVA, 440/ 220 V, 50 Hz single phase transformer has 275 secondary turns. The no load current of transformer is 2A at power factor 0.375 when connected to 220 V, 50 Hz supply. The full load copper loss is 198.3 watt. Calculate a) Maximum value of flux in the core. b) Maximum efficiency at 0.8 lagging p.f c) KVA supply at maximum efficiencyarrow_forwardQ1- A 5 KVA, 240/120 volt, single-phase transformer supplies rated current to a load at 120 V. Determine the magnitude of the load impedance as seen from the input terminals of the transformer. Ans. 11.52arrow_forward
- Q1- 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_forwardI am seeking ideas or references regarding the auxiliary power output for a trolley. I’ve encountered difficulties finding information online about the power output for lights, buzzers, and speakers. Specifically, I am interested in the following questions: How many lights, buzzers, and speakers can a trolley approximately 48 feet in length accommodate?How can I determine their rated power?Any guidance or resources you can provide would be greatly appreciated. Thank you!arrow_forward5. Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye-delta on a 12470 V, 3-phase line. If the load is 450 kVA, calculate the following currents: (1) In the incoming and outgoing transmission lines (2) In the primary and secondary windings (3) If this transformer is used to raise the voltage of a 3-phase, 600 V line to 7.2 kV. (a) How must they be connected? (b) Calculate the line currents for a 600 kVA load. (c) Calculate the corresponding primary and secondary currents.arrow_forward
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