T2 part 2
The opposition to current flow in an AC circuit containing a capacitor is
Capacitive reactance (Xc)
If two phases of a three phase motor are reversed
The motor will rotate in the opposite direction
when an iron core is inserted in a solenoid and the current is maintained the magnetic flux will
increase
A current carrying conductor inserted into a magnetic field
will experience a force
the angle of phase displacement between the phases of a 3-phase supply is
120 degrees
current flow in the rotor bars of a squirrel cage rotor is achieved by
electromagnetic induction from the stator windings
The cable gland of SWA cable must
clamp the armouring wires securely
The dielectric of a capacitor is
the material between the plates of the capacitor
The highest value of a half cycle alternating voltage is reffered to as
the maximum or peak value of the waveform
which of the following faults would cause a fluorescent lamp to flicker
faulty starter switch
A transformer input is 230v and its output is 115V the 115V winding is reffered to as
Secondary winding
If one line of a 3 phase induction motor is open circuit the current in the other two lines
Increase
The periodic time of a waveform is the
time taken to complete one cycle
segregated trunking is used to
accomodate low voltage and extra low voltage circuits
An AC waveform with a peak value of 10V would have an RMS value of
7.07V
Changing the rate of current flow in a coil causes a voltage to be induced in the same coil this effect is
Self induction
Steel conduit installed outdoors must be
Galvanised
A reason to limit the number of cables runs through a conduit
allow cables to be easily drawn in and easily removed
Plastic conduit must be used within the manufacturers stated range of
ambient temperature
An abbreviation used to indicate the current rating of a circuit fuse or MCB is
IN
An example of the stroboscopic effect would be
Rotating machinery appears to be stationary
An easily magnetised material is reffered to as
Ferromagnetic
A running coupler is used
when neither conduit can be rotated
the csa of the pins of a 115v industrial plug are
two small and one large round pin
the colour of the first phase conductor of a 3 phase supply is
Brown
Remote start buttons for a DOL starting system must be wired
In parallel with existing start buttons
Cables installed in an area of higher ambient temperature than stated by the ETCI rules must have a factor applied to their current carrying capacity in order to prevent
cable insulation being damaged from heat
Low pressure mercury vapour light fittings are commonly known as
fluorescent light fittings
metallic cable tray is
an exposed conductive part and must be bonded to earth
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