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The current and potential coils of a dynamometer type wattmeter were accidentally interchanged while connecting. After energizing the circuit, it was observed that the wattmeter did not show the reading, this could be due to:
- a)Damage to potential coils
- b)Damage to current coil
- c)Damage to both current coil and pressure
- d)Loose contacts
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
The current and potential coils of a dynamometer type wattmeter were a...
Electrodynamometer instrument has two fixed coils and one moving coil. For using this instrument as a wattmeter to measure the power, the fixed coils acts as a current coil and must be connected in series with a load. The moving coil acts as a pressure coil and must be connected across the supply terminals.
In the question given that, the current and potential coils of a dynamometer type wattmeter were accidentally interchanged while connecting. Hence total voltage applies across current coil which has very less resistance which leads to damage the current coil.
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The current and potential coils of a dynamometer type wattmeter were a...
Damage to Current Coil
If the current and potential coils of a dynamometer type wattmeter are accidentally interchanged while connecting, it can result in the wattmeter not showing any reading. The correct answer in this case would be option 'B', which suggests that the damage is to the current coil.
Here's an explanation of why damage to the current coil can cause the wattmeter to not show any reading:
Working Principle of a Dynamometer Type Wattmeter
A dynamometer type wattmeter consists of two coils - a fixed coil known as the current coil and a moving coil known as the potential coil. These coils are wound on a common iron core. The current coil is connected in series with the load, and the potential coil is connected across the load. The current flowing through the load creates a magnetic field in the current coil, which interacts with the magnetic field produced by the potential coil. This interaction causes a torque to be developed, causing the moving coil to rotate. The angle of rotation is proportional to the power being measured.
The Role of Current Coil
The current coil is responsible for generating the magnetic field that interacts with the potential coil. It is designed to carry the load current and produce the necessary magnetic flux. If the current coil is damaged or not functioning properly, it will not be able to generate the required magnetic field. As a result, the torque developed between the coils will be insufficient to cause the moving coil to rotate.
Effect on Wattmeter Reading
Since the moving coil does not rotate, the wattmeter needle remains stationary, and no reading is displayed. In this case, the wattmeter effectively becomes non-functional or "dead." The damage to the current coil prevents the generation of the necessary torque and hampers the measurement of power.
Other Possibilities
While option 'B' suggests that the damage is to the current coil, it is important to note that other possibilities could also result in a non-functional wattmeter. For example, loose contacts or damage to both the current coil and potential coil could also prevent the wattmeter from showing any reading. However, in the given scenario, where the coils were accidentally interchanged, it is reasonable to assume that the damage to the current coil is the most likely cause for the lack of reading.
If the current and potential coils of a dynamometer type wattmeter are accidentally interchanged while connecting, it can result in the wattmeter not showing any reading. The correct answer in this case would be option 'B', which suggests that the damage is to the current coil.
Here's an explanation of why damage to the current coil can cause the wattmeter to not show any reading:
Working Principle of a Dynamometer Type Wattmeter
A dynamometer type wattmeter consists of two coils - a fixed coil known as the current coil and a moving coil known as the potential coil. These coils are wound on a common iron core. The current coil is connected in series with the load, and the potential coil is connected across the load. The current flowing through the load creates a magnetic field in the current coil, which interacts with the magnetic field produced by the potential coil. This interaction causes a torque to be developed, causing the moving coil to rotate. The angle of rotation is proportional to the power being measured.
The Role of Current Coil
The current coil is responsible for generating the magnetic field that interacts with the potential coil. It is designed to carry the load current and produce the necessary magnetic flux. If the current coil is damaged or not functioning properly, it will not be able to generate the required magnetic field. As a result, the torque developed between the coils will be insufficient to cause the moving coil to rotate.
Effect on Wattmeter Reading
Since the moving coil does not rotate, the wattmeter needle remains stationary, and no reading is displayed. In this case, the wattmeter effectively becomes non-functional or "dead." The damage to the current coil prevents the generation of the necessary torque and hampers the measurement of power.
Other Possibilities
While option 'B' suggests that the damage is to the current coil, it is important to note that other possibilities could also result in a non-functional wattmeter. For example, loose contacts or damage to both the current coil and potential coil could also prevent the wattmeter from showing any reading. However, in the given scenario, where the coils were accidentally interchanged, it is reasonable to assume that the damage to the current coil is the most likely cause for the lack of reading.
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The current and potential coils of a dynamometer type wattmeter were accidentally interchanged while connecting. After energizing the circuit, it was observed that the wattmeter did not show the reading, this could be due to:a)Damage to potential coilsb)Damage to current coilc)Damage to both current coil and pressured)Loose contactsCorrect answer is option 'B'. Can you explain this answer?
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The current and potential coils of a dynamometer type wattmeter were accidentally interchanged while connecting. After energizing the circuit, it was observed that the wattmeter did not show the reading, this could be due to:a)Damage to potential coilsb)Damage to current coilc)Damage to both current coil and pressured)Loose contactsCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The current and potential coils of a dynamometer type wattmeter were accidentally interchanged while connecting. After energizing the circuit, it was observed that the wattmeter did not show the reading, this could be due to:a)Damage to potential coilsb)Damage to current coilc)Damage to both current coil and pressured)Loose contactsCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The current and potential coils of a dynamometer type wattmeter were accidentally interchanged while connecting. After energizing the circuit, it was observed that the wattmeter did not show the reading, this could be due to:a)Damage to potential coilsb)Damage to current coilc)Damage to both current coil and pressured)Loose contactsCorrect answer is option 'B'. Can you explain this answer?.
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