Daddys Quiz Part 1
THis quiz is for my father and his work with the linesmen company so he can practice his work and quiz himself.
- 1.The clearance between conductor line on an overhead line is determined by the :
- A.
Conductor Line
- B.
Voltage in the Line
- C.
Current in the Line
- D.
Power factor of the load
- 2.Where the mid point of one phase of a 3 phase 4 wire 240 delta connected secondary is grounded to supply lightning and similar loads the high leg voltage will measure :
- A.
120
- B.
240
- C.
180
- D.
208
- 3.In order to obtain the maximum secondary voltage from the transformer, the action to be taken to set the tap changer at
- A.
100%
- B.
104.5%
- C.
95.9%
- D.
95.5%
- 4.Two energized three phase liners are being phase test with a volt meter. When non corresponding phases are connected through the meter, the reading should be
- A.
Phase to ground voltage
- B.
Zero
- C.
Phase to neutral voltage
- D.
Phase to phase voltage
- 5.If loaf break equipment is not available on a 150 kva transformer bank the first action to take if it becomes necessary to open the bank is to
- A.
Open the primary disconnects
- B.
Ground the secondaries
- C.
Use the consumer service equipment to remove the load
- D.
Set the tap changer to 100%
- 6.One disadvantage of a 3 phase transformer compared to three single phase transformers is :
- A.
They cannot be operated on a reduced load emergency
- B.
Higher initial cost
- C.
They require more busbar structure and switch gear
- D.
They have a slightly lower operating efficiency
- 7.You wish to determine the peak load on a transformer secondary what instrument is required?
- A.
Recording meter
- B.
Maxl meter
- C.
Phase meter
- D.
Clip on ammeter
- 8.The potential at the star point on a underground three phase star connected transformer bank with two primary transformer fuses blown would be :
- A.
50%
- B.
75%
- C.
0%
- D.
100%
- 9.What is the first step taken when paraleling two single phase transformers
- A.
Read name plate of both transformers
- B.
Ascertain if primary phase is the same
- C.
Open fuse on second transformer and jumper secondaries
- D.
Jumper top secondary wire and read voltage between bottom secondaries
- 10.Which of the following is the acceptable method of preventing backfeed from a transformer
- A.
Short out primary bushing
- B.
Disconnect secondary risers
- C.
Tell costumer not to use any electrical equipment
- D.
Open the case ground
- 11.The main purpose of a stress relief cone on a 15 kv cable is to
- A.
Eliminate electrical stress at the cable termination
- B.
Prevent cable slipping through the throat clips
- C.
Eliminate mechanical stress on the cable
- D.
Prevent moistiure from entering the cable
- 12.The normal percentage change between taps on a distrubution transformer is
- A.
9.5%
- B.
4.5%
- C.
13.5%
- D.
2.5%
- 13.The primary neutral of a WYE delta bank is grounded, what could be the results
- A.
A fault on one transformer will cause the bank to automically become open WYE opens delta and possibly overload remaining two transformers.
- B.
The bank voltage will fluctuate wildly
- C.
Unbalanced neutral loading will cause the system fluctuatuion and possibly overload the remaining two transformers.
- D.
The bank will work normally.
- 14.Small cracks in the insulators may
- A.
Increase line resistance to ground
- B.
Cause arc over
- C.
Increase line voltage to ground
- D.
Be detected with the aid of a test lamp
- 15.A function of a lightning arrestor when serving a power system is to
- A.
Open the circuit when lightning strikes to the line
- B.
Act as open circuit during normal conditions
- C.
Limit the current to the ground during the fault
- D.
Reliever abnormal low voltage of the line
- 16.After lockout a circuit recloser is
- A.
Should be purged
- B.
Heeds to be reset manually
- C.
Will close automatically
- D.
Needs to have the recloser coil replaced
- 17.A simple device for limiting fault current is :
- A.
Current limiting fuse
- B.
Reactor
- C.
OCR
- D.
All of the above
- 18.A voltage regulator will when additional load is connected to the feeder
- A.
Increase the generator output
- B.
Boost the line voltage
- C.
Control the amount of load
- D.
Buck the line voltage
- 19.The percent impedance voltage figure shown on a transformer name plate is taken into consideration when
- A.
Connecting low power factor load to the transformer
- B.
Taking a single phase load off a three phase line
- C.
Two or more secondary distrubution lines are to be tapped off a wye connected primary
- D.
Connecting transformers in parallel
- 20.If an ammeter utilizing a current transformer is to be removed while the circuit is energized, the precaution which must be taken is,
- A.
Short circuit the secondary of the transformer before removing the ammeter
- B.
Connect the secondary of the transformer to the system ground
- C.
Short the secondary of the transformer after removing ammeter
- D.
De energize the circuit
- 21.When removing a voltmeter from a potential transformer the transformer terminals must never be
- A.
Placed in paralell with the line
- B.
Open circuited
- C.
Short circuited
- D.
Connected in series with the line
- 22.The best rope for use where die electric strength is required is
- A.
Polypropylene
- B.
Nylon
- C.
Manila
- D.
Dacron
- 23.The correct method of installing u bolt clamps on a wire rope is
- A.
Straggered one on live end, one on dead end
- B.
U bolts on dead end of rope
- C.
U bolts on live end of rope
- D.
None of the above
- 24.The first indication of overloading a hook is
- A.
Peeling paint
- B.
A worn spot
- C.
Straightening
- D.
None of the above
- 25.The primary function of a phase rotation meter indicator is to check
- A.
Sequence
- B.
Voltage
- C.
Resistance
- D.
Current
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