Unit 18 - Prepare for general electrical installations Quiz 6
  إظهار بيانات الطالب   إظهار التعليمات   تغيير اتجاه الصفحة

رقم السؤال: 1           درجة السؤال: 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
رقم السؤال: 2           درجة السؤال: 1
 Provide enough spaces
 Save a lot of money
 Provide protection against overload and short circuit current
 Daily demand
رقم السؤال: 3           درجة السؤال: 1
 Large circuit currents.
 Large short circuit currents.
  Out of balance circuit currents.
  Reduction in circuit currents
رقم السؤال: 4           درجة السؤال: 1
 Electric shock from direct contact
 Electric shock from indirect contact.
 Electric shock from overcurrent
 Electric shock from undervoltage
رقم السؤال: 5           درجة السؤال: 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”
رقم السؤال: 6           درجة السؤال: 1
 emergency switching
 isolator
 a fireman's switch
 partial disconnection
رقم السؤال: 7           درجة السؤال: 1
 Residual current device.
 Motor rated fuse.
 Starter contactor
 Surge protective device
رقم السؤال: 8           درجة السؤال: 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
رقم السؤال: 9           درجة السؤال: 1
 Current
 Potential
 impedance
 Angle
رقم السؤال: 10           درجة السؤال: 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


   



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