PHEP_32B Flashcards
An arrangement whereby additional load is divided between plants and is proportional to their efficiency at that load, is called:
a) control area
b) incremental loading
c) proportional loading
d) plant control
b) incremental loading ref: p. 6
An arrangement whereby loading of each unit is controlled separately and directly from a load dispatcher office is called:
a) area control
b) plant control
c) unit control
d) bias control
c) unit control ref: p. 8
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
a) tie-line bias control ref: p. 4
A control area:
a) is always confined to one system
b) is defined as s group of two or more systems connected together by uncontrolled ties
c) is never responsible for controlling frequency outside its own system
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
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 ref: p. 6
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
c) the frequency bias setting for the control area ref: p. 6 & 13
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
b) wheeling energy ref: p. 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
d) a loss of customer load or over-generation internally ref: p. 11
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
‘d) that each have the capability of operating independently ref: p. 16
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 of the above
d) all of the above ref: p. 8
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 of the above
a) the economical generation of electrical energy ref: p. 6
