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EE > PRE BOARDS EE > Flashcards

PRE BOARDS EE Flashcards

1
Q

*If the torque angle continuously increases, system will become

A

unstable

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2
Q

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

A

Fiber optic

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3
Q

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

A

126.675

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4
Q

Grounding allows ______ opposition path of current flow.

A

Low

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5
Q

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

A

Satellite

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6
Q

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

A

Full-pitch

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7
Q

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

A

4 quarter bends

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8
Q

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

A

Doubled

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9
Q

Three phase short circuit current of an alternator will be

A

Zero

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10
Q

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

A

Nominal pi network
Nominal T network

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11
Q

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

A

one-fourth of the original value

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12
Q

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

A

1.6921r

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13
Q

*The curve representing Ohm’s law is

A

Linear

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14
Q

What is PEMC in EPIRA stands for

A

Philippine Electricity Market Corporation

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15
Q

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

A

Suspension type

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16
Q

*The buchholz relay is used to protect the

A

oil immersed transformer against all internal faults

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17
Q

What is the device function number of overcurrent relay?

A

51

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18
Q

Breather mounted on transformer tank contains

A

calcium

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19
Q

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

A

differential relay

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20
Q

*Which of the following iteration method fastest to converge?

A

newton raphson

21
Q

The material commonly used for insulation in high voltage cables is

A

paper

22
Q

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

A

Short circuit

23
Q

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

A

Force on conductor

24
Q

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

A

Diesel Power Plant

25
Q

A standard candle emits a totally luminous flux of _____ lumens

A

12.57 (4pi)

26
Q

Synchronous motors are

A

not self starting

27
Q

*AC system has the following disadvantages over DC system except

A

charging current exists

28
Q

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

A

Capacitance

29
Q

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

A

Hydro power plant

30
Q

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

A

simplex

31
Q

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

A

the lake temperature increases

32
Q

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

A

full duplex

33
Q

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

A

5A

34
Q

*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

A

I only

35
Q

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

A

The lines cross themselves only at right angles

36
Q

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

A

gauss-seidel

37
Q

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

A

32

38
Q

The power transmission capacity of the transmission line is

A

proportional to the square of the voltage

39
Q

*Open circuit test on transformers is conducted to determine

A

Core loss

40
Q

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

A

local action

41
Q

If the field of a dc shunt motor is opened

A

the speed of the motor will become very high

42
Q

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

A

chemical effects

43
Q

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

A

Differential

44
Q

Power plant having the maximum efficiency is

A

Hydro

45
Q

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

A

newton raphson

46
Q

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

A

reduced by 1/3

47
Q

*In the transformers

A

high tension winding is used near the core

48
Q

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

A

Outages that occur on the primary lines of the distribution system

EE (3 decks)

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