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WorksheetsAC Motor Revision Part 3
Total questions: 15
Worksheet time: 8mins
A motor control circuit, for the most part, is simply a _____ and a motor.
Switch
Feeder
Motor
Magnet
During the positioning of an electrical motor it is found that the holes in the motor do not match holes in the base plate. Who should this be reported to?
Supervisor / Line Manager
The Engineer
The electrician
What kind of connection is this
STAR
DELTA
A 6 pole machine connected to a 60Hz supply. The speed of motor is?
20 rpm
1200 rpm
120 rps
120 rpm
Which of the following is not recognized part of single phase AC motor?
Electrolytic Capacitor
Slip rings
Start windings
Start and Run winding.
With increase of load, the speed of induction motor operating in the stable region is…………?
Increases and then becomes constant
Remains constant
Decreases
Increase
To increase starting torque in some AC motors
The rotor bars are angled.
The supplied current increase
The Supplied Voltage increase
The stator windings segregate
The speed of AC motor when not connected to the Load is provided by ?
Frequency
Frequency and current
Number of poles and frequency
Number of poles and voltage
In which area the motor rotation be changed?
Stator
Rotor
Terminal Box
Capacitor
The starting torque of an indication motor is maximum when
Rotor resistance equals rotor reactance
Rotor resistance is twice the rotor reactance
Rotor resistance is half the rotor reactance.
Rotor resistance is R2 times the rotor reactance.
1. We should use IP washer to maintain the IP rating of terminal box when glanding
True
False
Starters are used in induction motor because………..?
Its starting torque is high
It is run against heavy load
It cannot run in reverse direction
It reduce the inrush current
1. An AC motor is an electric motor driven by an -------------.
Direct current
Armature
Alternate current.
Both alternate and Direct current
1. Chose the item in below which is the first to be identify prior to dismantling the motor.
Location of motor eye bolt
Location of nameplate
Location of stator
Location of power supply source
1. Which item below determined the frequency of maintenance for AC motors?
Size of supply cables
Stability of motor
Use of motor
The frequency of supply power
