Republic of the Philippines PROFESSIONAL REGULATION COMMISSION Manila BOARD OF ELECTRICAL ENGINEERING REGISTERED MASTER ELECTRICIAN Licensure Examination ------------------------------------------------------------------------------ ------------------------------------------------- TECHNICAL SUBJECTS INSTRUCTION: Select the correct answer for each of the following questions. Mark only one answer for each item by shading the box corresponding on the letter of your choice on the answer sheet provided. STRICTLY NO ERASURES ALLOWED. Use pencil No. 1 only. MULTIPLE CHOICE 1. A DC generator supplies a load of resistance 1.4 ohms through a pair of wires having a total resistance of 0.10 ohm. The voltage at the DC generator terminals is 120 V, what is the voltage across the load? a. 110 V b. 105 V c. 112 V d. 115 V 2. If commutator is dirty, clean using a. sandpaper b. emery c. cloth d. oil 3. Which of the following causes extreme sparking at the brushes? a. worn bearing b. loose coupling c. dirt on the commutator segment d. shaft misalignment 4. What is the common method of cooling transformer? a. natural cooling b. air cooling c. air blast cooling d. oil cooling 5. A 50-kVA transformer has a primary voltage of 6600 volts and a secondary voltage of 250 volts. It has 100 turns on the secondary winding. Find the number of primary turns. a. 1336 turns b. 1373 turns c. 2640 turns d. 1733 turns
Republic of the PhilippinesPROFESSIONAL REGULATION
COMMISSIONManilaBOAR OF ELECTRICAL ENGINEERINGREGISTERE MASTER
ELECTRICIAN Licensu!e E"a#ination
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$TEC%NICAL
SUB&ECTSINSTRUCTION' Select the co!!ect ans(e! fo! each of the
follo(in) *uestions+Ma!, onl- one ans(e! fo!each ite# b- sha.in)
the bo" co!!espon.in) on the lette! of -ou! choice on the
ans(e!sheet p!o/i.e.+STRICTL0 NO ERASURES ALLO1E+Use pencil No+ 2
onl-+MULTIPLE C%OICE2+ A C )ene!ato! supplies a loa. of !esistance
2+3 oh#s th!ou)h a pai! of (i!es ha/in) a total !esistance of 4+24
oh#+The /olta)e at the C )ene!ato! te!#inals is 254 67 (hatis the
/olta)e ac!oss the loa.8a+224 6 b+249 6 c+225 6 .+229 65+ If
co##utato! is .i!t-7 clean usin) a+san.pape! b+e#e!- c+cloth
.+oil:+ 1hich of the follo(in) causes e"t!e#e spa!,in) at the
b!ushes8a+(o!n bea!in) b+loose couplin)c+.i!t on the co##utato!
se)#ent.+shaft #isali)n#ent3+ 1hat is the co##on #etho. of coolin)
t!ansfo!#e!8a+natu!al coolin) b+ai! coolin) c+ai! blast coolin)
.+oil coolin)9+ A 94$,6A t!ansfo!#e! has a p!i#a!- /olta)e of ;;44
/olts an. a secon.a!- /olta)e of 594 /olts+ It has 244 tu!ns on the
secon.a!- (in.in)+ Fin. the nu#be! of p!i#a!- tu!ns+a+2::; tu!ns
b+2:
