3e0x1 EOC Set 2 Electrical Systems Apprentice
Set 1-4 of 2nd set for EOC Test
- 1.The preferred Air Force base distribution system is
- A.
3-phase, 4-wire
- B.
Single-phase, 3-wire
- 2.A substation with one incoming transmission circuit and three outoging distribution circuits has (at least) how many lighting arresters?
- A.
12
- B.
4
- 3.Which item supplies control voltage to operate circuit Breakers?
- A.
Current Transformers
- B.
Batteries
- 4.What is the configuration of an induction-voltage regulator's primary and secondary windings?
- A.
The primary is in series and the secondary is in shunt
- B.
The primary is in shunt and the secondary is in series
- 5.In regards to the circuit, how are a step-voltage regulators's primary and secondary windings configured?
- A.
Primary is in series and the secondary is in series
- B.
Primary is in parallel and the secondary is in series
- 6.When can the secondary of a current transformer be opened?
- A.
When the secondary is deenergized
- B.
When the primary is deenergized
- 7.Which is not a major fuunction of an oil circuit breaker?
- A.
To minimize damage to a system by opening the circuit when an overload occurs
- B.
To stabalize current flow during an overload situation
- 8.What oil circuit breaker components supply amperage to the protective relays?
- A.
Current transformers
- B.
Terminal bushings
- 9.What percent of electrical system faults are temporary?
- A.
95 percent
- B.
25 percent
- 10.Of these devices, which does not interrupt a fault current?
- A.
Oil circuit breaker
- B.
Sectionalizer
- 11.Air-break switches can be used to break a circuit "under load" if they have
- A.
Vacuum switches
- B.
Arc horns
- 12.Why is the arc extinguisheed so quickly in a vacuum recloser?
- A.
The oil absorbs the fault current
- B.
There is very little oxygen to burn
- 13.The insulating quality of sulfur hexafluoride (SF6), at 0 PSI, is how much greater than dry air?
- A.
6 1/2 times
- B.
2 1/2 times
- 14.A high-voltage switch is connected to the distribution system that is to protect in
- A.
Series
- B.
Parallel
- 15.What is usually installed with an oil circuit breaker to allow for equipment maintenence, letting you keep the circuit in operation?
- A.
Fused cutouts and a backup oil circuit recloser
- B.
Knife blades and a normally open air-break switch
- 16.Oil breaker contacts that are discolore by excessive heat should be
- A.
Adjusted
- B.
Replaced
- 17.Dielectrically check the oil in oil circuit breakers
- A.
Monthly
- B.
Every 6 months
- 18.Which of theses acids mixed with water is an effective solution for cleaning insulators and bushings?
- A.
Sulfuric
- B.
Muriatic
- 19.What do you use to clean the arc interrupters of an air-break switch?
- A.
Cloth or light sanding
- B.
Lint free cloth or round file
- 20.Clean a modern air switch that has been closed for a long time by
- A.
Using a clean cloth and wire brush
- B.
Opening and Closing the switch several times
- 21.Battery bank maintenence is normally done
- A.
Every 6 months
- B.
Monthly
- 22.What do we use to test a battery cell for its specific gravity?
- A.
Hydrometer syringe
- B.
Barometric gauge
- 23.What must you do if you add water to a battery in freezing temperatures?
- A.
Mix the solution with a stainless steel rod
- B.
Charge the battery
- 24.The dielectric test voltage for a realy that is rated at 600 volts is
- A.
1,500 volts
- B.
2,200 volts
- 25.After a wiring change to a control device, check substaion circuits for
- A.
Tightness of connections
- B.
Proper operation
Questions: 25 | Attempts: 731 | Last updated: Mar 21, 2022
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