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A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, then
- a)motor will not start
- b)armature will draw large current from source
- c)no sparking would occur
- d)all of the mentioned
Correct answer is option 'D'. Can you explain this answer?
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A dc shunt motor is connected to the source through 3-point starter. I...
Leaving the field winding open, the machine will not start as the exciting flux is zero.
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A dc shunt motor is connected to the source through 3-point starter. I...
Answer:
When a DC shunt motor is connected to the source through a 3-point starter and the field is kept open, and the starter handle is moved from the off to the on position, the following things happen:
**1. Motor will not start:**
- Since the field circuit is open, there will be no magnetic field in the motor.
- The absence of a magnetic field means that there will be no torque produced in the motor, and as a result, the motor will not start.
**2. Armature will draw large current from the source:**
- When the motor is not running and the field circuit is open, the armature circuit acts like a short circuit.
- As a result, a large current will flow through the armature winding.
- This large current is known as the locked rotor current or starting current.
- The magnitude of this current is determined by the armature resistance and the supply voltage.
- The high starting current can cause overheating and damage to the armature winding.
**3. No sparking would occur:**
- Since the field circuit is open, there will be no current flowing through the field winding.
- The absence of current in the field winding means that there will be no sparking at the brushes or commutator.
- Sparking occurs when there is a sudden interruption of current flow due to the opening or closing of circuits.
- In this case, since the field circuit is already open, there will be no sparking when the starter handle is moved.
**4. All of the mentioned:**
- The correct answer is option D, as all of the mentioned statements are true.
- The motor will not start, the armature will draw a large current from the source, and no sparking will occur when the field is kept open and the starter handle is moved from the off to the on position.
In summary, when a DC shunt motor is connected to the source through a 3-point starter and the field circuit is open, the motor will not start, the armature will draw a large current, and no sparking will occur.
When a DC shunt motor is connected to the source through a 3-point starter and the field is kept open, and the starter handle is moved from the off to the on position, the following things happen:
**1. Motor will not start:**
- Since the field circuit is open, there will be no magnetic field in the motor.
- The absence of a magnetic field means that there will be no torque produced in the motor, and as a result, the motor will not start.
**2. Armature will draw large current from the source:**
- When the motor is not running and the field circuit is open, the armature circuit acts like a short circuit.
- As a result, a large current will flow through the armature winding.
- This large current is known as the locked rotor current or starting current.
- The magnitude of this current is determined by the armature resistance and the supply voltage.
- The high starting current can cause overheating and damage to the armature winding.
**3. No sparking would occur:**
- Since the field circuit is open, there will be no current flowing through the field winding.
- The absence of current in the field winding means that there will be no sparking at the brushes or commutator.
- Sparking occurs when there is a sudden interruption of current flow due to the opening or closing of circuits.
- In this case, since the field circuit is already open, there will be no sparking when the starter handle is moved.
**4. All of the mentioned:**
- The correct answer is option D, as all of the mentioned statements are true.
- The motor will not start, the armature will draw a large current from the source, and no sparking will occur when the field is kept open and the starter handle is moved from the off to the on position.
In summary, when a DC shunt motor is connected to the source through a 3-point starter and the field circuit is open, the motor will not start, the armature will draw a large current, and no sparking will occur.
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A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, thena)motor will not startb)armature will draw large current from sourcec)no sparking would occurd)all of the mentionedCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, thena)motor will not startb)armature will draw large current from sourcec)no sparking would occurd)all of the mentionedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, thena)motor will not startb)armature will draw large current from sourcec)no sparking would occurd)all of the mentionedCorrect answer is option 'D'. Can you explain this answer?.
A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, thena)motor will not startb)armature will draw large current from sourcec)no sparking would occurd)all of the mentionedCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, thena)motor will not startb)armature will draw large current from sourcec)no sparking would occurd)all of the mentionedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, thena)motor will not startb)armature will draw large current from sourcec)no sparking would occurd)all of the mentionedCorrect answer is option 'D'. Can you explain this answer?.
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