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Unit 18 - Prepare for general electrical installations Quiz 6
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Q1
Score: 1
Capable of breaking the full load of the circuit
Be manually operated directly interrupting the main circuit
Capable of regulating the voltage
Be provided with means of operation capable of latching in the “OFF” or “STOP position”
Q2
Score: 1
Provide enough spaces
Save a lot of money
Provide protection against overload and short circuit current
Daily demand
Q3
Score: 1
Residual current device.
Motor rated fuse.
Starter contactor
Surge protective device
Q4
Score: 1
It is expensive
Needs extra voltage to operate
Requires time for the heat to build in the heater before the bimetal bends
Operates instantaneous
Q5
Score: 1
Switch must be accessible in an emergency
Switch must be able to break full-load current
Switch must be a remote stop button
Switch must be an off-load isolator
Q6
Score: 1
Current
Potential
impedance
Angle
Q7
Score: 1
High electrical and thermal resistance
High mechanical strength in tension, compression and shear
High resistance to fatigue failure
Low electrical resistance of surface films
Q8
Score: 1
Large circuit currents.
Large short circuit currents.
Out of balance circuit currents.
Reduction in circuit currents
Q9
Score: 1
Electric shock from direct contact
Electric shock from indirect contact.
Electric shock from overcurrent
Electric shock from undervoltage
Q10
Score: 1
emergency switching
isolator
a fireman's switch
partial disconnection
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