I need the answer quickly 1. A 240-V d.c. shunt motor has an armature resistance of 0.4 Q and field resistanceof 110 Q. At no load, the speed is 1400 r.p.m and the armature current 2.2 A. On application of rated load, thespeed drops to 1200 r.p.m. Determine the line current and power input when the motor delivers rated load.2. 1-ph transformer has the following test results measured at the same Bmax:f/Hz:20 40 50 60 80 100Core loss/W: 6 24 ? 54 96 150Calculate the hysteresis and eddy current losses at f-50HZ.

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Answered: 1. A 240-V d.c. shunt motor has an…

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.28MCQ

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1. In a transformer, which options are correct:A. Works on Faraday’ law and Ampere’s lawB. DC current in the primary winding will produce voltage output in the secondary windingC. Copper losses are caused by reluctance in magnetic circuitD. Frequency of input power source will not govern the voltage induced in secondary circuit.2. Voltage ratio of input voltage and output voltage in IDEAL transformer depends on:A. Leakage fluxB. Magnetization currentC. Copper loss currentD. Turns ratio3. The core of transformer must have:
4. In a transformer, which options are correct: A. Works on Faraday’ law and Ampere's law B. DC current in the primary winding will produce voltage output in the secondary winding C. Copper losses are caused by reluctance in magnetic circuit D. Frequency of input power source will not govern the voltage induced in secondary circuit. 5. Voltage ratio of input voltage and output voltage in IDEAL transformer depends on: A. Leakage flux B. Magnetization current C. Copper loss current D. Turns ratio 6. The core of transformer must have A. Low reluctance C. High reluctance B. High resistance D. Low resistance 7. An overexcited synchronous motor behaves like: B. Resistive load D. DC generator A. Inductive load C. Capacitive load 8. The amount of real power delivered by a synchronous generator connected to an infinite bus can be controlled by adjusting A. System frequency C. Full load frequency B. No load frequency D. Terminal voltage
Can I have a little help with this , or an explanation to how to get started . A solution would be great ! The primary winding of a single phase transformer is connected to a 220 V, 50 Hz supply. The secondary winding has 2000 turns. If the maximum value of the core flux is 0.003 Wb, determine:- the number of turns on the primary winding;- the secondary induced voltage.
1) Identify, which component of no load current supplies hysteresis loss, in a practical transformer? a. None of these b. IM c. IC d. I0
A 10-kVA, 1-phase transformer has a turn ratio of 300/23. The primary is connected to a 1500-V, 60 Hz supply. Find the secondary volts on open-circuit and the approximate values of the currents in the two windings on full-load. Find also the maximum value of the flux.
10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core. 11. In a two-winding transformer, the e.m.f.per turn in secondary winding is always.........the induced e.m.f. power turn in primary. (a) equal to K times (b) equal to 1/K times (c) equal to (d) greater than. 12. In relation to a transformer, the ratio 20: 1 indi- cates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary.
A 3-phase 100OKVA, 11000/416 transformer is delta- connected on the primary and star connected on the secondary. The primary resistance / phase is 1.45 Q and secondary resistance/phase is 0.0006 Q. determine the efficiency on full-load at 0.85 power factor lagging if the iron loss is 1770 W. *
Single phase half wave AC-AC converter has a resistance of R = 50 ohms. Input voltage is given as 230 Vrms. Transformer conversion ratio is 1:1. If T1 thyristor is triggered at 60 degrees; a)Rms output voltage? b)Output power? c)RMS load current and average load current? d)Input power factor? e)Average and RMS thyristor current?
A single phase 60 Hz transformer has its core volume of 1.5x10-3 cu m. The maximum flux density is 1.0 tesla and the hysteresis constant of the core is 6000. find the hysteresis loss.
When the transformer is supplied at 400 V, 50-hz the hysteresis loss is found to be 300 W and eddy current loss is found to be 250 W. Determine the hysteresis loss when the transformer is supplied at 800 V, 100-hz.
2 Identify, which component of no load current supplies hysteresis loss, in a practical transformer? a. IC b. I0 c. None of these d. IM
5. Transformer cores are laminated in order to (a) simplify its construction (b) minimise eddy current loss (c) reduce cost (d) reduce hysteresis loss. 6. A transformer having 1000 primary turns is connected to a 250-V a.c. supply. For a secondary voltage of 400 V, the number of secondary turns should be (a) 1600 (b) 250 (c) 400 (d) 1250 7. The primary and secondary induced e.m.fs. E, and E₂ in a two-winding transformer are always (a) equal in magnitude (b) antiphase with each other (c) in-phase with each other (d) determined by load on transformer second- ary. 8. A step-up transformer increases (a) voltage (b) current (c) power (d) frequency. F

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