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