SUBSTATION ELECTRICIAN
APPRENTICESHIP 2025/26 QUESTIONS
WITH ACTUAL SOLUTIONS.
1 of 72
Definition
Applied pressures must not exceed the ratings of the hoses and
regulators, do not hook up high pressure source to the low side of
the regulator, use the correct bottle fitting, all hoses, high and low
pressure, should be secured to prevent whipping if a break occurs,
the regulator-adjusting valve should be in the off position
before apply pressure and it should be stored in the off
position.
Give this one a try later!
Explain some of the hazards of What are the basic safe work
working with high pressure practices observed in a 230KV or
, hoses and regulators. 500KV receiving station?
What are the major categories of Explain some of the hazards
a Substation Maintenance possible while adding SF6 gas to
switching tailboard? energized equipment?
Don't know?
2 of 72
Term
What different types of capacitor banks for we use in 500KV and
230KV receiving station?
Give this one a try later!
They are isolated capacitor banks. They are underground capacitor
They are used for frequency banks. They are used for voltage
correction. stabilization.
They are overhead They are indoor capacitor banks.
capacitor banks. They can They are connected in delta
be found is series or parallel configurations.
connections.
Don't know?
3 of 72
Definition
,A limit switch is an electro-mechanical relay, that operates when the
gas or position it is monitoring reaches a designed point at which the
limit switch will perform a set action. They are used for controlling
machinery as part of a control system, as a safety interlocks, or
to count objects passing a point.[1] A limit switch is an
electromechanical device that consists of an actuator
mechanically linked to a set of contacts. When an object comes
into contact with the actuator, the device operates the contacts to
make or break an electrical connection.
Give this one a try later!
What is a hygrometer? What is a limit switch?
What is the main purpose of What is a timer used for in EHV
an accumulator? breaker maintenance?
Don't know?
4 of 72
Term
Given an equipment number, i.e. PB748, explain what this number
tells you.
Give this one a try later!
PB is the substation name, 7 is It would overload the motor, It
the voltage class, 4 would either start with great
indicates the bay the difficulty, trip the overload
equipment is in
, and 8 designates the position protector and/or possibly burn up
98% oonf tAhecirmcouittosrw. itcher, brings in and
athllene qwubiprmeaeknetrsin,9t8h out
%e obnay.
Palo Verde Breakers, 97% on
capacitor banks under load. It is not
all other voltage class
used to interrupt faults.
breakers
including older 500KV breakers.
Don't know?
5 of 72
Term
Define contact wipe.
Give this one a try later!
Contact wipe is the pressure
applied between the contacts when Contact wipe is the speed at which
they touch. the contacts move during closure.
Contact wipe is the distance Contact wipe is the amount of
between the contacts when they travel of the moving
are fully open. contacts after they touch the
stationary contacts.
Don't know?
APPRENTICESHIP 2025/26 QUESTIONS
WITH ACTUAL SOLUTIONS.
1 of 72
Definition
Applied pressures must not exceed the ratings of the hoses and
regulators, do not hook up high pressure source to the low side of
the regulator, use the correct bottle fitting, all hoses, high and low
pressure, should be secured to prevent whipping if a break occurs,
the regulator-adjusting valve should be in the off position
before apply pressure and it should be stored in the off
position.
Give this one a try later!
Explain some of the hazards of What are the basic safe work
working with high pressure practices observed in a 230KV or
, hoses and regulators. 500KV receiving station?
What are the major categories of Explain some of the hazards
a Substation Maintenance possible while adding SF6 gas to
switching tailboard? energized equipment?
Don't know?
2 of 72
Term
What different types of capacitor banks for we use in 500KV and
230KV receiving station?
Give this one a try later!
They are isolated capacitor banks. They are underground capacitor
They are used for frequency banks. They are used for voltage
correction. stabilization.
They are overhead They are indoor capacitor banks.
capacitor banks. They can They are connected in delta
be found is series or parallel configurations.
connections.
Don't know?
3 of 72
Definition
,A limit switch is an electro-mechanical relay, that operates when the
gas or position it is monitoring reaches a designed point at which the
limit switch will perform a set action. They are used for controlling
machinery as part of a control system, as a safety interlocks, or
to count objects passing a point.[1] A limit switch is an
electromechanical device that consists of an actuator
mechanically linked to a set of contacts. When an object comes
into contact with the actuator, the device operates the contacts to
make or break an electrical connection.
Give this one a try later!
What is a hygrometer? What is a limit switch?
What is the main purpose of What is a timer used for in EHV
an accumulator? breaker maintenance?
Don't know?
4 of 72
Term
Given an equipment number, i.e. PB748, explain what this number
tells you.
Give this one a try later!
PB is the substation name, 7 is It would overload the motor, It
the voltage class, 4 would either start with great
indicates the bay the difficulty, trip the overload
equipment is in
, and 8 designates the position protector and/or possibly burn up
98% oonf tAhecirmcouittosrw. itcher, brings in and
athllene qwubiprmeaeknetrsin,9t8h out
%e obnay.
Palo Verde Breakers, 97% on
capacitor banks under load. It is not
all other voltage class
used to interrupt faults.
breakers
including older 500KV breakers.
Don't know?
5 of 72
Term
Define contact wipe.
Give this one a try later!
Contact wipe is the pressure
applied between the contacts when Contact wipe is the speed at which
they touch. the contacts move during closure.
Contact wipe is the distance Contact wipe is the amount of
between the contacts when they travel of the moving
are fully open. contacts after they touch the
stationary contacts.
Don't know?
