WorksheetsTransmission and Distribution System Quiz
Total questions: 25
Worksheet time: 13mins
What is the primary function of electrical power transmission?
Distribute electricity to consumers
Transform voltage at substations
Store electricity in power plants
Generate electrical energy
What is the typical voltage generated in advanced countries for electrical power transmission?
33kV
11kV
66kV
132kV
What is the purpose of a step-up transformer in the transmission of electricity?
Distribute voltage
Reduce voltage
Increase voltage
Store voltage
What is the voltage level at which distribution companies like MERALCO bring electricity to homes?
33kV
132kV
66kV
11kV
What type of system is commonly used for secondary distribution in most countries?
3-phase, 4 wire system (STAR)
2-phase, 2 wire system
3-phase, 3 wire system (DELTA)
Single-phase system
What is the formula for calculating percentage voltage regulation?
(VR - VS) / VR
(VR - VS) / VS
(VS - VR) / VR
(VS + VR) / VR
What is the efficiency of an overhead 3-d Transmission line delivering 5000kw at 22kv at 0.8 p.f lagging?
85.25%
93.94%
81.67%
76.12%
According to Kelvin's Law, what is the most economical area of conductor based on?
Atmospheric conditions
Total annual cost of transmission
Conductor material
Line voltage
What is the phenomenon known as corona in an overhead transmission line?
Reduction in conductor size
Production of ozone gas
Power loss
Voltage drop
What factor affects the occurrence of corona in an overhead transmission line?
Spacing between conductors
Atmosphere
Line voltage
Conductor size
What is the critical disruptive voltage in relation to corona in a transmission line?
Minimum phase to neutral voltage
Average phase to neutral voltage
Variable phase to neutral voltage
Maximum phase to neutral voltage
What are the advantages of corona in an overhead transmission line?
Induces interference
Causes corrosion of conductors
Reduces electrostatic stress
Increases transmission efficiency
What is the formula for calculating power loss due to corona in a transmission line?
P = 1000 x V/I
P = 242.2 (F+25/6) √R/D (V-VX)2 x 10-5 KW/KM/PH
P = V x I
P = V/I
What method can be used to reduce corona in an overhead transmission line?
Reduce spacing between conductors
Increase line voltage
Use smaller diameter conductors
Utilize bundled conductors
What is the purpose of a power transformer in electrical power generation and distribution?
Increase voltage
Reduce voltage
Store voltage
Distribute voltage
What is the final stage in the delivery of electric power?
Transmission system
Distribution system
Generation system
Consumer system
What do primary distribution lines carry?
High voltage power to consumers
Low voltage power to consumers
Medium voltage power to consumers
Step down voltage to consumers
What is the purpose of feeders in a distribution system?
To carry electricity from substation to consumers
To distribute electricity within a substation
To generate electricity
To store electricity
What is the drawback of a radial electrical power distribution system?
Consumers receive inconsistent power
Consumers may experience power outages
Consumers receive excess power
Consumers receive power at a high cost
What is the main reason for using D.C. supply in certain applications?
To limit consumer access
To operate variable speed machinery
To reduce system efficiency
To increase power consumption
What is the equivalent of a ring main electrical power distribution system?
A straight distributor fed at both ends
A straight distributor fed at one end
A singly fed distributor
A doubly fed distributor
What is the voltage relationship between phase voltage and line voltage in a 3-phase, 4-wire star connected system?
Phase voltage is equal to line voltage
Phase voltage is greater than line voltage
Line voltage is greater than phase voltage
Phase voltage is half of line voltage
What must be considered when solving A.C. distribution problems?
Power factor of various load currents
Only voltage drops
Only power factors
Only load currents
What is the purpose of a neutral wire in a 3-phase, 4-wire star connected system?
To limit consumer access
To reduce system efficiency
To balance the system
To increase power consumption
What is the purpose of an interconnected system in power distribution?
To reduce power generation
To limit consumer access
To improve system efficiency
To increase power consumption
