choose the correct answer 1. The maximum break down strength of air at 76 cm mercury pressure and temperature of 25 ºC is a. 30 V/cm b. 30 kV/cm c. 300 kV/cm 2. The installed capacity of a power station must be not.... a. Less b. equal c. more 3. Area under the daily load curve divided by 24 hour gives daily d. Non of them than the maximum demand. d. Non of them ......... .... a. average load in kW. b. maximum demand in kW. c. units generated in kwh. d. Non of them 4. In thermal power station, 5 kwh need to burn fuel has. a. 860 k.calorific. b. 1500 k.calorific c. 4300 k.calorific d. Non of them. 5. Francis and Kaplan turbines are used for .. heads. a. medium and high b. medium and low c. medium only. 6. For photo voltage cell, Fill factor is d. High only a. Vmpimp Uscise b. Vscisc Vmpimp c. Vmpimp d. Vscisc 7. Power available from wind mill is ვ. PA V² 1 b. -A V² 20 c. PA V³ d. pA V³

choose the correct answer 1. The maximum break down strength of air at 76 cm mercury pressure and temperature of 25 ºC is a. 30 V/cm b. 30 kV/cm c. 300 kV/cm 2. The installed capacity of a power station must be not.... a. Less b. equal c. more 3. Area under the daily load curve divided by 24 hour gives daily d. Non of them than the maximum demand. d. Non of them ......... .... a. average load in kW. b. maximum demand in kW. c. units generated in kwh. d. Non of them 4. In thermal power station, 5 kwh need to burn fuel has. a. 860 k.calorific. b. 1500 k.calorific c. 4300 k.calorific d. Non of them. 5. Francis and Kaplan turbines are used for .. heads. a. medium and high b. medium and low c. medium only. 6. For photo voltage cell, Fill factor is d. High only a. Vmpimp Uscise b. Vscisc Vmpimp c. Vmpimp d. Vscisc 7. Power available from wind mill is ვ. PA V² 1 b. -A V² 20 c. PA V³ d. pA V³

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

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.16P: A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and...

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A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)
Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.
7. TY Hat CHICL Ans. 1. Iron los.........varies approximately as V². 2. Cu loss..........it also varies as ² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa. quems
8 = 0 Q1: What does happen if we change two currents? Q2: What does happen if we have a three-phase four poles machine? a Q3: What does happen if we have a two-phase two poles machine? Q4: What does happen if we apply a capacitance in phase b and then use same voltage for both phase. Dr. Ali K....p. . --
What effects are produced by change in voltage? 1. Iron los..........varies approximately as V². 2. Cu loss..........it also varies as V² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa.
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The number of disc insulators used in a suspension insulator setup with string efficiency 80 %, phase voltage 33 kV, and the voltage across insulator nearest to conductor 11 kV is .......................... Complete the answer.
Id is : 510221
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A 6 ampere supply has a frequency of 25 Hz. Find the instantaneous value of current a. at 0.00986sec from zero going to the positive direction. b. at 0.00986 sec from zero going to the negative direction. c. at 986 degrees. Show complete solutions.
Q20. The section bus-bars A and B as shown in Figure B5 are linked by a bus-bar reactors each rated at 5000 kVA with 10% reactance. On bus-bar A, there are two generators each of 10,000 kVA with 10% reactance and on B two generators each of 8000 kVA with 12 % reactance. Find the Current and MVA that fed into a dead short circuit between all phases on B with bus-bar reactor in the circuit. Page 4 of 5 جامعة التقنية والعلومر التطبيقية بإبراء University of Technology and Applied Sciences - Ibra Student ID: Section: Student Name: 8,000 kVA 12% 10,000 kVA 10,000 kVA 10% 8,000 kVA 12% 10% 2 3 5,000 kVA 10% lell 8,000 kVA 10% Figure B5 "End of Question Paper"
The section bus-bars A and B are linked by a bus-bar reactor rated at 6000 kVA with 12% reactance. On bus-bar-A, there are two generators each of 10 MVA with 8% reactance and on bus-bar-B, two generators each of 6000 kVA with 10% reactance. Find the steady MVA fed into a dead short circuit all phases on B with bus-bar reactor in the circuit.