a conductor loop is rotated uniformly within a two pole magnetic field, at what point is the maximum voltage induced? - ️️when the loop is cutting the lines of flux at 90 degrees.
Apparent power (inductive loads - ️️
CIVIL - ️️in a Capacitor, the I leads the V, whereas, the V leads th...
a conductor loop is rotated uniformly within a two pole magnetic field, at what point is the maximum
voltage induced? - ✔ ✔ when the loop is cutting the lines of flux at 90 degrees.
Apparent power (inductive loads - ✔ ✔
CIVIL - ✔ ✔ in a Capacitor, the I leads the V, whereas, the V leads the I in an L: inductor
Equation for Power Factor in single phase - ✔ ✔ PF = P(W) / VA
formula to calculate total resistance in a resistive parallel circuit - ✔ ✔ 1/Rt = 1/R1 + 1/R2 + 1/R3 + ...
how can the direction of rotation of a 3 phase induction motor be reversed? - ✔ ✔ By reversing any
two of the incoming line leads.
how does a ammeter fit into a single phase a.c. circuit? - ✔ ✔ In series with the load
how does a voltmeter fit into a single phase a.c. circuit? - ✔ ✔ In parallel to the load being measured
how does a watmeter fit into a single phase a.c. circuit? - ✔ ✔ in series and in parallel to the load
being tested
how many line cables are required between an electromagnetic autotransformer starter and the
associated squirrel cage induction motor? - ✔ ✔ three line cables. an earth is usually required.
how much voltage is induced in a conductor when it is moved in a parallel direction to magnetic lines of
flux? - ✔ ✔ 0v. A voltage is only induced if the conductor crosses the lines of flux
how will wiring systems be effected if the safe working current for a wire is exceeded - ✔ ✔
Overheating of the wiring and magnetic stresses
how would you know if a transformer had shorted turns? - ✔ ✔ Low resistance on your ohm meter
in general, what is the main reason that single insulated 230v equipment be earthed? - ✔ ✔ to
ensure that the protective devices will operate in fault conditions if any exposed metallic parts come
into contact with the voltage
in installation with an MENdevelops a fault whereby a person recieves an electric shock from metal
water pipes. what is the most likely cause? - ✔ ✔ open circuit or high resistance is the main neutral
conductor.
, is it permissible to have a mixed final sub-circuit, supplying lights and socket outlets on a construction
site? - ✔ ✔ No
list FOUR values of alternating current - ✔ ✔ peak value\nroot mean square\naverage
value\ninstantaneous value\npeak to peak
List SIX factors which effect the severity of an electric shock. - ✔ ✔ voltage value\n- current value\n-
path of current through the body\n- duration of contact\n- body resistance\n- point on cardiac cycle
list the internal parts of an MEN - ✔ ✔ protective earth
neutral return path
transformer neutral
Transformer winding
associated active to fault
B4.4
list the six types of tests that must be completed before an installation is deemed safe - ✔ ✔ Visual
Earth continuity
Insulation resistance
Polarity
Correct circuit connections
Fault loop impedance
Operation of RCDS
max resistance of the earthing conductor and the connection to a transformer? - ✔ ✔ 1 Ohm
Maximum values of earth fault loop impedence (live) - ✔ ✔ Table 8.1
Maximum values of resistance (dead) - ✔ ✔ Table 8.2
name FIVE types of 3 phase current limiting motor starters - ✔ ✔ Primary resistance \nstar-
delta\nAutotransformer \nelectronic\nSecondary resistance
name the protection device that is used to protect a 400/415v 3 phase squirrel cage induction motor
from overheatingdue to excessively high line currents - ✔ ✔ Overload relay
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