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Electrical Engineering
Page 8
Questions (467)
A single-phase motor draws 0,75 kW from a 220V supply. If the motor is operating at unity power factor, calculate:
a) The current
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A 3,5kW 240V single-phase motor draws 22,5A from the supply while operating at full load and efficiency of 90°. Calculate
a) The
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A 3,5kW 240V single-phase motor draws 22,5A from the supply while operating at full load and an efficiency of 90°. Calculate
a)
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A 3,5kW 240V single-phase motor draws 22,5A from the supply while operating at full load and an efficiency of 90°. Calculate
a)
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golden rule to be applied when doing 3 phase calculations
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True or false
The output of an alternator is mechanical power
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True or false
The output of a motor is electrical power
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True or false
All given three phase voltages are taken as line values
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An alternative name for three-phase four-wire system
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An alternating name for delta connection
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A three-phase load takes a line current of 18 A from a 525V supply. Calculate the following:
a) The phase current and phase
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A 60kW 2,2kW three-phase star connected alternator supplies a load at a power factor of 0,8 lagging. If the alternator is
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A 60kW 2,2kW three-phase star-connected alternator supplies a load operating at a power factor of 0,8 lagging. If the alternator
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A 60kW 2,2kW three-phase star-connected alternator supplies a load operating at a power factor of 0,8 lagging. If the alternator
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9. A voltmeter and frequency meter connected across the terminals of a single-phase alternator running on no load gave readings
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A 33kVA 240V single-phase alternator supplies a small factory operating at a power factor of 0,75 lagging. If the alternator
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............ is indicate battery voltage or alternater aut put voltage
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Sefu.
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Why conductors of a cable may be stranded
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Why cables are shielded or screened
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A block of flats is connected to a 240 V single-phase supply. Calculate The maximum permissible voltage drop between the supply
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Takalani Ndadza
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A block of flats is connected to a 240V single-phase supply. Calculate
a) The maximum permissible voltage drop between the point
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A three phase transformer has the following specs 300 KVA 440V. the impedance marked on the nameplate is 3.3% . Determine the
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A single-phase installation is supplied at 240V. The conductors used in the stove circuit have a resistance of 0,5 ohm. With all
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A 12,5kW single-phase inductive load operation at a power factor of 0,75 lagging is connected to a 240V supply. Each conductor
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Two protective devices used to protect cables against overcurrent
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The most important environmental factor that must be considered when selecting a suitable cable
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3 advantages of pvc-insulated cables
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What does SANS 10142 state about cables and their protection
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What does the code of practice state with regard to the manufacturer's instruction when joining cables
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What is the type of ferrule used to join a copper conductor to an aluminum conductor
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Are cold shrink joints replacing the heat shrink method? Give reasons for your answer
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An electrician is a person who does electrical work. When the electricity goes out, an electrician can help. What part of speech
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Explain the principle of operation of a simple alternating current generator
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Explain the operating principle of a transformer and derive the transformer equation
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A voltage of 120v a.c is supplied to a calculator which uses only 24v. What type of transformer is required? If the resistance
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Write 20 examples of primary transformers and 20 examples of secondary transformers
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What do we call circuit breakers that have an overload rating of less than 100A
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design a ladder diagram to illuminate continuously PL9 5 sec on and 5 second off
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The following signal is sampled by 12-bit ADC triggered by timer TIM7. The timer clock frequency is 80 MHz. The value of
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An analog signal is sampled by 12-bit ADC triggered by timer TIM7. The timer clock frequency is 80 MHz. The value of TIM7_PSC
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The following signal is sampled by an ADC triggered by timer TIM6. The timer clock frequency is 80 MHz. The value of TIM6_PSC
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Use of Ground in electrical
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Design a ladder diagram to shut off 3 motors with 10 sec intervals use TOF
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R1=20oHM
R2=40oHM R3=60 OHM V=120 fInd in parrel circuit w/c VT?,IT, PT
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What is an important feature included in indicating fuses
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Function of orl(overload relay)
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What causes severe starting in overload relays
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A pure inductance of 1.273mh is connected with series with a pure resistance of 50 ohms if the frequency of the sinusoidal
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Arafat
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Are the following statements true or false. Give a reason for each
a)The principle of operation of a three-phase and single-phase
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Three causes o transient voltages
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