PRE BOARDS EE

Question 1

*If the torque angle continuously increases, system will become

Answer 1

unstable

Question 2

A type of communication that uses light rather than electricity to communicate is called _____

Answer 2

Fiber optic

Question 3

What is the size in a square millimeter is the cable 250MCM size?

Answer 3

126.675

Question 4

Grounding allows ______ opposition path of current flow.

Answer 4

Low

Question 5

A space station with communication equipment that synchronizes with the earth’s orbit

Answer 5

Satellite

Question 6

*The dc armature winding in which the coil sides are placed a pole pitch apart is called ______

Answer 6

Full-pitch

Question 7

*What is the maximum number if bends permitted in rigid conduits between outlets?

Answer 7

4 quarter bends

Question 8

When the length of wire is doubled and all other factors remained the same, what would the wire resistance become?

Answer 8

Doubled

Question 9

Three phase short circuit current of an alternator will be

Answer 9

Zero

Question 10

*In two terminal pair of network of a transmission line can be represented by a _______

Answer 10

Nominal pi network
Nominal T network

Question 11

By increasing the transmission voltage double its original value, the same power can be dispatched keeping the line loss

Answer 11

one-fourth of the original value

Question 12

A conductor has four identical strands arranged in diamond configuration. Find the GMR of the conductor in terms of the radius r of each strand

Answer 12

1.6921r

Question 13

*The curve representing Ohm’s law is

Answer 13

Linear

Question 14

What is PEMC in EPIRA stands for

Answer 14

Philippine Electricity Market Corporation

Question 15

*Which of the following insulator will be selected for high voltage application?

Answer 15

Suspension type

Question 16

*The buchholz relay is used to protect the

Answer 16

oil immersed transformer against all internal faults

Question 17

What is the device function number of overcurrent relay?

Answer 17

51

Question 18

Breather mounted on transformer tank contains

Answer 18

calcium

Question 19

87 is the device function number assigned by ANSI to this relay:

Answer 19

differential relay

Question 20

*Which of the following iteration method fastest to converge?

Answer 20

newton raphson

Question 21

The material commonly used for insulation in high voltage cables is

Answer 21

paper

Question 22

*Copper loss of a transformer are determined by means of a/an ______ test.

Answer 22

Short circuit

Question 23

*In the left hand rule, thumb always represents direction of the ______

Answer 23

Force on conductor

Question 24

*Which of the following cannot have a single unit of 100MW?

Answer 24

Diesel Power Plant

Question 25

A standard candle emits a totally luminous flux of _____ lumens

Answer 25

12.57 (4pi)

Question 26

Synchronous motors are

Answer 26

not self starting

Question 27

*AC system has the following disadvantages over DC system except

Answer 27

charging current exists

Question 28

*Which of the following parameters can be neglected for a short line?

Answer 28

Capacitance

Question 29

*Which of the following power plant will take least time in starting from cold condition to full load condition?

Answer 29

Hydro power plant

Question 30

A type of communication channel that sends information in one direction only

Answer 30

simplex

Question 31

*The power generated by some steam power plants drops in the summer because ______

Answer 31

the lake temperature increases

Question 32

*In which type of electronic communications does the information travel in two directions?

Answer 32

full duplex

Question 33

What is the normal secondary circuit current of a current transformer?

Answer 33

5A

Question 34

*What is/are the main reason/s for using high voltage in the transmission of power in the grid system? I. to transmit bulk power with minimum line losses. II. increase system reliability

Answer 34

I only

Question 35

*Which of the following is NOT a property of magnetic field lines?

Answer 35

The lines cross themselves only at right angles

Question 36

*Which of the following approximation has lesser work to do but many iterations?

Answer 36

gauss-seidel

Question 37

What is the device function number of a directional power relay?

Answer 37

32

Question 38

The power transmission capacity of the transmission line is

Answer 38

proportional to the square of the voltage

Question 39

*Open circuit test on transformers is conducted to determine

Answer 39

Core loss

Question 40

*Impurities in an electrolyte can cause an internal short circuit condition called

Answer 40

local action

Question 41

If the field of a dc shunt motor is opened

Answer 41

the speed of the motor will become very high

Question 42

Which of the following effects are generally less for an alternating current than for a direct current?

Answer 42

chemical effects

Question 43

What is the type of relay that is intended to respond to the difference between incoming and outgoing electrical quantities?

Answer 43

Differential

Question 44

Power plant having the maximum efficiency is

Answer 44

Hydro

Question 45

*A type of approximation that has a lot of work to do but it will converge fast

Answer 45

newton raphson

Question 46

In case of delta connected circuit, when one resistor is open, power will be

Answer 46

reduced by 1/3

Question 47

*In the transformers

Answer 47

high tension winding is used near the core

Question 48

*Which of the following shall be included in the calculations of the reliability standard indices of the distributor asset by the Philippine Distribution Code?

Answer 48

Outages that occur on the primary lines of the distribution system