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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller jackline98. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
