LE1

Question 1

True or False. No immediate damage will be caused by permitting the alternator to run without a field for a short period

Answer 1

True

Question 2

What is the protective device used for over speeding in alternators?

Answer 2

Centrifugal devices

Question 3

True or False. Over voltage results to over voltage.

Answer 3

True

Question 4

What is the protection against the phase to phase and phase to ground faults in alternators?

Answer 4

Differential Protection

Question 5

It is used for multi-turn generators such as hydro-electric generators which have double winding armatures

Answer 5

Inter-turn fault protection

Question 6

It is classified as areas where heavy congestion in electric network is frequent.

Answer 6

Zonal markets

Question 7

It is classified as areas where congestion in electric network is less frequent.

Answer 7

Nodal market

Question 8

True or False. Nodal markets are viewed as superior to zonal markets because they have the ability to reduce costs associated with congestion in heavily populated areas

Answer 8

True

Question 9

True or False. Zones are transparent in pricing.

Answer 9

False

Question 10

True or False. Nodal markets provide a better pricing system that strives for complete transparency

Answer 10

True

Question 11

True or False. For zonal markets residents of predominately industrious zones are forced to pay higher electrical bills even though the majority of energy used is from commercial businesses.

Answer 11

True

Question 12

True or False. In a nodal market, communities are priced individually, which means that a residential community will not have to pay additional fees for companies that use large amounts of electricity.

Answer 12

True

Question 13

True or False. Nodal markets essentially offer lower rates than zonal markets because they do not group several neighbourhoods together when analysing usage.

Answer 13

True

Question 14

What is the transmission line capacity for 230kV?

Answer 14

300MW

Question 15

What is the transmission line capacity for 500kV?

Answer 15

2650MW

Question 16

It is the process of making the production, transmission, and consumption of electrical energy as safe as possible from the effects of failures and events that may place the power system at risk.

Answer 16

Power system protection

Question 17

The main objective is to make the power system ______ safe and ______ reliable.

Answer 17

100% ; 100%

Question 18

It is any condition that causes abnormal operation for the power system or equipment serving the power system.

Answer 18

Faults

Question 19

What are the 6 common faults?

Answer 19

Short circuits, open circuits, power swings, over voltage, elevated temperature, and off-nominal frequency operation

Question 20

It is an electrical circuit that allows a current to travel along an unintended path, often where essentially no (or very low) electrical impedance is encountered.

Answer 20

Short circuit

Question 21

It lacks a complete path between the terminals of its power source.

Answer 21

Open circuit

Question 22

It is basically caused by the large disturbances in the power system which if not blocked could cause wrong operation of the distance relay and can generate wrong or undesired tripping of the transmission line breaker.

Answer 22

Power swing

Question 23

What are the two classification of over voltage?

Answer 23

External over voltage, and internal over voltage

Question 24

This originates from atmospheric disturbances, mainly due to lightning. This takes the form of surge and has no direct relationship with the operating voltage of the line.

Answer 24

External over voltage

Question 25

This is caused by changes in operating conditions of the power system

Answer 25

Internal over voltage