13691757
Questão 1
Questão
What is the name of the transformer with one common winding?
Responda
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Autotransformer
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Step-down transformer
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Current transformer
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Step-up transformer
Questão 2
Questão
The output of electrical motor is:
Responda
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Magnetic
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Mechanical
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chemical
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light
Questão 3
Questão
Which of the following is used to check the heat element's continuity?
Responda
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ohmmeter
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Voltmeter
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Ammeter
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Tachometer
Questão 4
Questão
In a DC motor, what is the relationship between power power fietoa
Responda
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Inversely proportional
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Equal
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None
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Directly proportional
Questão 5
Questão
Which translates loss is due to resistances of the primary and secondary coil?
Responda
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Copper losses
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Stray losses
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Iron losses
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Mechanical losses
Questão 6
Questão
The motor without a centrifugal switch is
Responda
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Capacitor start motor
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Capacitor run motor
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Capacitor start capacitor run motor
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Split phase motor
Questão 7
Questão
In an AC motor, what is the relationship between power and power factor
Responda
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None
-
Inversely proportional
-
Equal
-
Directly proportional
Questão 8
Questão
which of the following motors has no auxiliary winding?
Responda
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Capacitor run motor
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Capacitor start motor
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Split phase motor
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Repulsion motor
Questão 9
Questão
The brushes are made of
Responda
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Copper
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Carbon
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Steel
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Aluminim
Questão 10
Questão
The transformer winding insulated by:
Responda
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Varnish
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Wood
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Plastic
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Carbon
Questão 11
Questão
What material is used in the magnetic core of the transformer?
Responda
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Copper
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Varnish
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Steel
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Wood
Questão 12
Questão
Which of the following electrical parameters is not considered in DC motors?
Responda
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Voltage
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Power
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Power factor
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Current
Questão 13
Questão
Which of the following is not a method to control the speed of a DC motor?
Responda
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Flux control method
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Armature control method
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Multiple voltage control
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Winding turns control
Questão 14
Questão
Which of the following instruments in not used in electrica testing of a transformer?
Responda
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Multi-meter
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Tachometer
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Voltmeter
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Insulation tester
Questão 15
Questão
What DC motor is shown below?
Responda
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Sepately excited
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Long compound
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Shunt
-
Series
Questão 16
Questão
What is the unit of torque, T?
Responda
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Hertz
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Watts
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Newton-meter
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Revolutions per minurt e
Questão 17
Questão
The losses due to the winding resistances in electrical machines is also known as:
Responda
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Hysteresis
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Eddy current loss
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Friction loss
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Copper loss
Questão 18
Questão
At what percent of the rated speed does the dentrifugal switch disconn e auxiliary winding?
Responda
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15%
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100%
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75%
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50%
Questão 19
Questão
Which of the following is not a type of DC motor?
Responda
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Permanent magnet
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Separately excited
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Capacitor start
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start
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