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