PHEP 32

Question 1

An isolated system is not concerned with problems dealing with:

a) load control
b) time errors
c) frequency control
d) interconnected system operation

Answer 1

d) interconnected system operation

Question 2

Flat frequency control

a) is used only for single unit plants
b) describes a control arrangement where one unit of a multi-unit plant may assigned to control frequency
c) used only in multi-unit systems
d) describes control arrangement whereby all units within a plant are operating at a fixed load

Answer 2

b) describes a control arrangement where one unit of a multi-unit plant may assigned to control frequency

Question 3

A control scheme in which each system, interconnected by the tie lines is controlling frequency simultaneously is called:

a) tie-line bias control
b) flat frequency control
c) flat tie-line control
d) system control

Answer 3

a) tie-line bias control

Question 4

A control area

a) other
b) other
c) other
d) is one or more systems operating with metering and control facilities on all of its ties to other system outside of the control area

Answer 4

d) is one or more systems operating with metering and control facilities on all of its ties to other system outside of the control area

Question 5

The combined governor action and inertia of all generating units connected to a system is used to establish:

a) a factor for incremental loading of these units
b) the percentage of proportional loading of each
c) the frequency bias setting for the control area
d) load diversity tables

Answer 5

c) the frequency bias setting for the control area

Question 6

Incremental loading refers mainly to

a) the economical generation of electrical energy
b) the division of electrical loading between units within a plant
c) the division of electrical loading between plants in a system
d) none above

Answer 6

a) the economical generation of electrical energy

Question 7

A procedure whereby two system, not directly tied together, exchange electrical energy with each other through a third system to which they are mutually connected is called:

a) load sensitivity
b) wheeling energy
c) economy energy
d) energy accounting

Answer 7

b) wheeling energy

Question 8

An intersystem tie-line meter shows high frequency and power flow out. This would be an indication of:

a) a loss of generation internally
b) a loss of generation externally
c) over-generation externally
d) a loss of customer load or over-generation internally

Answer 8

d) a loss of customer load or over-generation internally

Question 9

One essential requirement to be met before two systems consider interconnecting with each other is:

a) that each have load diversity capabilities
b) that each have similar governor and inertia response characteristics
c) that each have facilities for energy accounting
d) that each have the capability of operating independently

Answer 9

d) that each have the capability of operating independently

Question 10

Unit control of load and frequency is preferred over plant control because:

a) it provides quicker response during emergencies
b) it limits the effects of component failure
c) units may be loaded more efficiency
d) all above

Answer 10

d) all above