EE TERMS

April 2022:

In subsequent iteration, a voltage-controlled bus is treated as a load bus when its

Voltage limit is violated

Active power limit is violated

Reactive power limit is violated

Phase angle limit is violated

April 2022:

If the reference bus is changed in two load-flow runs with the same system data and power obtained for reference bus taken as specified P and Q in the latter run

The system losses will be unchanged but complex bus voltages will change

The system losses will change but complex bus voltages will change

The system losses as well as complex bus voltage will change

The system losses as well as complex bus voltage will be unchanged

April 2022:

The phenomenon of rise in voltage at the open circuited or slightly loaded line is called.

Raman effect

Seedbeck effect

Ferranti effect

Skin effect

April 2022:

Nine identical wires, each of diameter d and length L, are connected in series. The combination has the same resistance as a single similar wire of length L but whose diameter is:

D/3

D/9

Sept 2022:

No kinetic energy is possessed by

A shooting star

A rotating propeller on a moving airplane

A pendulum at the bottom of its swing

An elevator standing at fifth floor

Sept 2022:

Which is NOT the advantage of using per unit values?

For transmission lines, its value of impedance and admittances in physical units (e.g. ohms/km) that are of same magnitude regardless of voltage level or MVA rating

Voltage, currents, and impedances expressed in per unit do not change when they are referred from one side of transformer to the other side

The parameters of transformers as well as rotating machines lie roughly in the same range of numerical values irrespective of their ratings if expressed in Per Unit System of their ratings

Voltages have same range in per unit in all parts of the system from EHV system to distribution and utilization

Sept 2022:

A golf ball is struck by a golf club and falls on a green three meters above the tree. The potential energy of the Earth-ball system is greatest _____.

Just before the ball is struck

When the ball reaches the highest point in its flight

When the ball comes back to rest on the green

Just after the ball is struck

Sept 2022:

Two wires are made of the same material and have the same length but different diameters. They are joined end-to-end and a potential difference is maintained across the combination. Of the following the quantity that is the same for both wires is:

Potential difference

Current density

Current

Electric field

Sept 2022:

Silica gel prevents air moisture from entering the outdoor transformer tank. It is placed in

Conservator

Breather

Core

Windings

Sept 2018: RA 7832 concerns on _________

Pilferage of electricity, theft of transmission materials and capping of system loss

Pilferage of electricity, theft of transmission materials and rationalizing of system loss

Pilferage of electrical energy

Pilferage of electricity and electrical materials

Sept 2018:

Series capacitors are used to

Improve the line voltage

Compensate for line inductive reactance

Compensate for line capacitive reactance

None of these

Sept 2018:

A two terminal pair of network of a transmission line can be represented by a

π-network

T-network

Either (a) or (b)

Tree network

Sept 2018:

Base load plants are designed to supply power at

Low capital cost and low operating cost

High capital cost and low operating cost

Low capital cost and high operating cost

High capital cost and high operating cost

Sept 2018:

Peak load plants are designed to supply power at

Low capital cost and low operating cost

High capital cost and low operating cost

Low capital cost and high operating cost

High capital cost and high operating cost

Sept 2018:

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

Outages that occur on the secondary lines of the distribution system

Planned outages where the customers have been notified at least three (3) days prior to the loss of power

Outages that occur on the primary lines of the distribution system

Outages that occur in the transmission line

Sept 2021:

GMC was created by the Energy Regulatory Commission to monitor the compliance of the users of the Grid to PGC. What is the GMC stands for?

Grid Market Commission

Generation Management Corporation

Grid Management Committee

Generator Management Committee

Sept 2021:

For any circuit the number of independent equations containing emf’s, resistances, and currents, equal to the number of __________.

Branches minus 1

Junctions

Branches

Junction minus 1

April 2023:

A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?

Decreases

Increases

Remains same

First increases and then decreases depending on the depth of iron in-sertion.

April 2023:

Acurrent is clockwise around the outside edge of this page and a uniform magnetic field is directed parallel to the page, from left to right. If the magnetic force is the only force acting on the page, the page will turn so the right edge:

Moves toward you

moves away from you

Moves to your right

Moves to your left

April 2023:

Is any building, room or separate place which houses or encloses electrical supply equipment connected to transmission or distribution lines and the interior of which is accessible, as a rule, only to properly qualified persons.

General room

Electric plant

Electric supply room

Substation

April 2023:

The winding of a power transformer usually develops short circuit on account of

Mechanical vibration

Impulse voltage

Loose connection

Insulation failure

April 2023:

Whichofthe following is/are the drawbacks of SF6circuit breakers?

I. Sealing problem of gas

II. Ingress of moisture in the gas system is dangerous

I only

Il only

Either I or II

Both I and II

April 2023:

A magnet moves inside a coil. Which of the following factors can affect the emf induced in the coil?

I. The speed at which the magnet moves

II. The magnetic field of the magnet

III. The number of turns in the coil

I only

I and II only

II and III only

I, II and III

EE TERMS

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