Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Multiple Choice Electrical Engineering Questions, Transcriptions of Music

Music

A set of multiple-choice questions covering various topics in electrical engineering, including fault currents, transformer calculations, power system analysis, motor performance, and electrical installations. The questions test the reader's understanding of fundamental concepts and their ability to apply them to solve practical problems. The document could be useful for students preparing for exams, assignments, or seeking to review and reinforce their knowledge in these areas of electrical engineering.

Typology: Transcriptions

2022/2023

Uploaded on 02/22/2023

francis-dehora
francis-dehora 🇵🇭

5 documents

1 / 6

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
SEAT NO.:_____
Republic of the Philippines
PROFESSIONAL REGULATION COMMISSION
Manila
BOARD OF ELECTRICAL ENGINEERING
REGISTERED ELECTRICAL ENGINEERING Licensure Examination
Sept, 2010
8:00 a.m. – 12:00 nn.
------------------------------------------------------------------------------------------------------------
ELECTRICAL ENGINEERING-PROFESIONAL SUBJECT
INSTRUCTION: Select the correct answer for each of the following questions.
Mark only one answer for each item by shading the box corresponding to
the letter of your choice on the answer sheet provided. STRICTLY NO
ERASURES ALLOWED. Use pencil no. 1 only.
MULTIPLE CHOICES
1. The zero and negative sequence component fault current does not appear on this
type of fault
a. line to line fault b. Three Phase symmetrical fault
c. single line to ground fault d. double line to ground fault
2. A coil of 10 resistance and 0.1 H inductance is connected in parallel with a
capacitor of unknown capacitance. If the total impedance of the combination is 100 ,
determine the value of the capacitance.
a. 50 F b. 100 F c. 150 F d. 200 F
3. A 3-phase breaker is rated at 2000 MVA, 33kV, its making current will be:
a. 35 kA. b. 49 kA. c. 70 kA. d. 89 kA.
4. A 5 MVA, 13.8 kV/480 V, 5 % impedance transformer is tapped at 13.8 kV line where
the thevenin’s equivalent impedance is ½ ohm. Determine the fault current at the
primary for a three phase fault at the secondary.
a. 10 500 A b. 3 300 A c. 4 200 A d. 6 050 A
5. The effective voltage across a circuit element is (20 + j10) V and the effective current
through the element is 4 – j3 A. Calculate the true and reactive power taken by the
element.
a. 50 watts & 100 Vars lagging b. 50 watts & 100 Vars leading
c. 110 watts & 20 Vars lagging d. 110 watts & 20 Vars leading
6. If the fault current is 2000 amps, the relay setting 50% and the C.T. Ratio is 400/5,
then the plug setting multiplier will be:
a. 25 A b. 15 A c. 50 A d. 25 A
pf3
pf4
pf5

Partial preview of the text

Download Multiple Choice Electrical Engineering Questions and more Transcriptions Music in PDF only on Docsity!

SEAT NO.:_____

Republic of the Philippines PROFESSIONAL REGULATION COMMISSION Manila

BOARD OF ELECTRICAL ENGINEERING

REGISTERED ELECTRICAL ENGINEERING Licensure Examination Sept, 2010 8:00 a.m. – 12:00 nn.

ELECTRICAL ENGINEERING-PROFESIONAL SUBJECT

INSTRUCTION: Select the correct answer for each of the following questions. Mark only one answer for each item by shading the box corresponding to the letter of your choice on the answer sheet provided. STRICTLY NO ERASURES ALLOWED. Use pencil no. 1 only.

MULTIPLE CHOICES

  1. The zero and negative sequence component fault current does not appear on this type of fault a. line to line fault b. Three Phase symmetrical fault c. single line to ground fault d. double line to ground fault
  2. A coil of 10  resistance and 0.1 H inductance is connected in parallel with a capacitor of unknown capacitance. If the total impedance of the combination is 100 , determine the value of the capacitance. a. 50 F b. 100 F c. 150 F d. 200 F
  3. A 3-phase breaker is rated at 2000 MVA, 33kV, its making current will be: a. 35 kA. b. 49 kA. c. 70 kA. d. 89 kA.
  4. A 5 MVA, 13.8 kV/480 V, 5 % impedance transformer is tapped at 13.8 kV line where the thevenin’s equivalent impedance is ½ ohm. Determine the fault current at the primary for a three phase fault at the secondary. a. 10 500 A b. 3 300 A c. 4 200 A d. 6 050 A
  5. The effective voltage across a circuit element is (20 + j10) V and the effective current through the element is 4 – j3 A. Calculate the true and reactive power taken by the element. a. 50 watts & 100 Vars lagging b. 50 watts & 100 Vars leading c. 110 watts & 20 Vars lagging d. 110 watts & 20 Vars leading
  6. If the fault current is 2000 amps, the relay setting 50% and the C.T. Ratio is 400/5, then the plug setting multiplier will be: a. 25 A b. 15 A c. 50 A d. 25 A
  1. Two impedances ZA = 4 + j6  and ZB = 6 + j12  are connected in parallel. The apparent power for the impedance B is 1490 VA. Determine the total apparent power. a. 4250 VA b. 3290 VA c. 2652 VA d. 8031 VA
  2. The p.u. impedace value of an alternator corresponding to base values 13.2 kV and 30 MVA is 0.2 p.u. value for the base values 13.8 kV and 50 MVA will be: a. 0.306 p.u. b. 0.33 p.u. c. 0.318 p.u. d. 0.328 p.u.
  3. If the secondary of the transformer having the reactance of 4% is short circuited with normal voltage applied to the primary the symmetrical short circuit current will be a. 4 times of the full load current b. 25 times of the full load current c. 2 times of the full load current d. 8 times of the full load current
  4. Which of the following statements is true? a. 0.5 – j 0.866 b. a = 0.5 + j 0. c. a^4 = -a d. a^2 = -(1+a)
  5. A 15 MVA, 34.5 kV/6.24 kV transformer is connected at an infinite bus. The percent impedance of the transformer is 2.5%. What is the current at the 34.5 kV side for a three-phase fault at the 6.24 kV side? a. 55,500 A b. 10,000 A c. 5,000 A d. 25,000 A
  6. In a short circuit study, the positive, negative and zero sequence impedance are 0. pu, 0.25 pu and 0.3 pu, respectively. The base MVA is 100. Determine the fault current for a three-phase fault at the 115 kV level. a. 3,000 A b. 2,000 A c. 2,500 A d. 3,500 A
  7. In a short circuit study, the positive, negative and zero sequence impedance are 1.081 pu, 1.081 pu and 0.0245 pu, respectively. The base MVA is 100. Determine the fault current for a double line to ground at the 230 kV level. a. 120,500 A b. 150,500 A c. 180,500 A d. 130,500 A
  8. If a generator is supplying reactive power to the power system, the generator is best described as operating: a. overexcited b. leading c. unity d. underexcited
  9. A utility distribution bus has the following individual customer loads attached. What is the total customer MW load and is the total customer load capacitive or inductive? Load 1--- 5 MW and 1 Mvar Load 2--- 3 MW and 1 Mvar Load 3--- 2 MW and -2 Mvar Load 4--- 10 MW and 3 Mvar a. 3 Mvar / Inductive b. 20 MW / Inductive c. 20 MW / Capacitive d. 3 Mvar / Capacitive
  10. If the input to the prime-mover of an alternator is kept constant but the excitation is changed then a. the reactive component of the output is changed b. the active component of the output is changed

a. the volume of conductor required is inversely proportional to the square of voltage and that of the power factor of load b. the volume of the conductor is inversely proportional to voltage and that of power factor of load c. the volume of the conductor is proportional to square of the voltage and directly proportional to power factor of load d. the volume of the conductor required is proportional to voltage only

  1. If A, B, C and D are the constants of the medium transmission line, which of the following relation is correct? a. AB – CD = -1 b. AD + BD = 1 c. BC – AD = -1 d. AC – BD = 1
  2. Calculate the torque in Nm developed by a 440 V dc motor having an armature resistance of 0.25 ohm and running at 750 rpm when taking a current of 60 A. a. 345 Nm b. 325 Nm c. 253 Nm d. 543 Nm
  3. A coil having a resistance of 10  and an inductance of 4 H is switched across a 20- V dc source. Calculate the time taken by the current to reach 50% of its final steady value. a. 0.028 sec b. 0.64 sec c. 2.329 sec d. 0.277 sec
  4. A short 230 KV transmission line has an impedance of 5 cis 78° ohms. The sending end power is 100 MW at 230 KV and 85% power factor. What is the percent regulation of the line? a. 3.6% b. 2.2% c. 1.5% d. 0.77%
  5. Calculate the size of the service entrance conductor necessary for a single family dwelling supplying a limited load of a single branch circuit having a rating of 1200 VA lighting load and 1375 VA appliance load a. 5.5 sq. mm b. 8.0 sq. mm c. 3.5 sq. mm d. 14.0 sq. mm
  6. At a 34.5 kV substation, the available fault current is 25 pu. What is the available fault MVA if the base is 10 MVA? a. 25 MVA b. 40 MVA c. 10 MVA d. 100 MVA
  7. If Vs = VR = 33 kV for three phase transmission and reactance is 13 ohms per phase. What will be the maximum power transmission per phase? a. 29 MW b. 28 MW c. 30 MW d. 60 MW
  8. Three alternating currents are given by i 1 = 100 sin (t + 45) ; i 2 = 50 sin (t + 90); i 3 = 10 cos (t - 120). Find the equation of resultant current. a. 167.4 sin (t + 45.66) b. 74.6 sin t c. 143.8 sin (t + 51.4) d. 64.7 sin (t - 30)
  9. An 8 m x 6 m restaurant is partitioned into different sections for the following purpose: 5 m x 6 m for customer service area

2 m x 6 m for small office area 1 m x 6 for storage area and facility room what is the total computed VA for lighting load? a. 862VA b. 1080 VA c. 828 VA d. 988 VA

  1. Motor A and Motor B has a full load current of 21 A, motor C, 15 A and Motor D, 20 A. The ampacity of the feeder conductor supplying these motors is based on what percentage of highest full load current of the motor in the group? a. 85 A b. 75 A c. 80 A d. 105
  2. For a feeder supplying household cooking equipment and electric clothes dryers the maximum unbalanced load on the neutral conductor shall be considered as ______ of the load on the ungrounded conductors. a. 40% b. 50% c. 70% d. 80%
  3. A 200-F capacitor is connected in series with the primary winding of a 60-HZ ideal transformer. The primary winding impedance is (2 + j10)  and the secondary circuit impedance is (0.4 + j0.2) . If the turns ratio is 2, what is the input impedance? a. 4.36  b. 3.64  c. 6.43  d. 36.4 
  4. The power input to a 30-HP, 220-V shunt motor is 2,100 watts taken at no-load. The field and armature resistances are 73 and 0.11 , respectively. What is the efficiency for an input current of 100 A? a. 78.5% b. 87.5% c. 85.7% d. NOT
  5. Neglecting saturation, if current taken by a series motor is increased from 10 A to 12 A, the percentage increase in its torque is ________ percent. a. 20 b. 44 c. 30.5 d. 16.
  6. Three unbalanced 3 line voltages are given as follows: VA = 10 cis 30o VB = 30 cis (– 60 o) VC = 15 cis 145o What is the negative sequence component of line voltage VC? a. 8.24 cis (– 156.2o) b. 8.24 cis (– 36.2o) c. 8.24 cis (– 276.2o) d. 0
  7. A room 8 m x 12 m is lighted by 15 lamps to fairly uniform illumination of 100 lumens per sq. meter. What is the coefficient of utilization if the output of each lamp is 1, lumens? a. 30% b. 40% c. 50% d. 60%
  8. A system is consists of three equal resistors connected in delta and is fed from a balanced three-phase supply. By how much power is reduced if one of the resistors is disconnected? a. 33% b. 67% c. 50% d. 25%
  9. Two single-phase transformers operate in parallel. Transformer 1 is rated 100 kVA with 4% reactance while transformer 2 is rated 75 kVA with 3% reactance. The transformers have secondary voltages of 220 volts and same voltage ratio. If the