State TRUE/FALSE for following statements with reference to the dynamometer type instruments: The scale is non-uniform. Air friction damping is used.a)Statement 1 and 2 both are falseb)Statement 1 and 2 both are truec)Statement 1 is false and Statement 2 is trued)Statement 1 is true and Statement 2 is falseCorrect answer is option 'C'. Can you explain this answer? - EduRev Electrical Engineering (EE) Question

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State TRUE/FALSE for following statements with reference to the dynamometer type instruments:

The scale is non-uniform.
Air friction damping is used.

a)
Statement 1 and 2 both are false
b)
Statement 1 and 2 both are true
c)
Statement 1 is false and Statement 2 is true
d)
Statement 1 is true and Statement 2 is false

Correct answer is option 'C'. Can you explain this answer?

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State TRUE/FALSE for following statements with reference to the dynamo...

Understanding Dynamometer Type Instruments
Dynamometer type instruments are widely used for measuring various electrical and mechanical quantities. To evaluate the statements provided, let's analyze each one in detail.
Statement 1: The scale is non-uniform.
- This statement is false.
- In dynamometers, the scale is typically designed to be uniform. A uniform scale allows for consistent readings across the entire measurement range, which is crucial for accuracy.
Statement 2: Air friction damping is used.
- This statement is true.
- Air friction damping is commonly employed in dynamometer type instruments. The damping mechanism helps stabilize the pointer movement, preventing oscillations and enabling a clear reading. It enhances the response time and accuracy of the instrument.
Conclusion
- Given the analysis, we find that Statement 1 is false while Statement 2 is true.
- Therefore, the correct answer is option 'C': Statement 1 is false and Statement 2 is true.
This understanding aids in the effective use and interpretation of dynamometer type measuring instruments in various engineering applications.

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State TRUE/FALSE for following statements with reference to the dynamo...

Dynamometer type instruments:

Dynamometer-type instruments working on the principle of " Changing the mutual inductance."
It responds to both AC as Well as DC quantity.

The dynamometer-type instrument is shown below.

There are two types of coils in this instrument. they are named as Fixed and Moving coil.
The fixed coil also called the Current coil and the moving coil named the Pressure coil.
Dynamometer develops deflected torque (Td) by the interaction of magnetic fields.
Dynamometer instrument can be used as Ammeter, Voltmeter, and Wattmeter.
But it is more effective in the Wattmeter type because power is proportional to the square of the current.
The scale is uniform in the Wattmeter type.
While using it as Ammeter its scale is square-law scale (non-uniform) because of the deflecting torque.
Air friction damping is employed for these instruments and is provided by a pair of aluminium vanes, attached to the spindle at the bottom.

Deflecting torque developed in DC Power Measurement:
T_d ∝ V I₁
Where,

V is the voltage applied
I₁ is the current through the wattmeter
The deflecting torque is directly proportional to the power delivered to the load.

Deflecting torque developed in AC Power Measurement:
T_d ∝ V I₁ cos ϕ
The deflecting torque is directly proportional to the real power of the circuit.
Therefore, In an ac dynamometer-type wattmeter, the instantaneous value of developed deflecting torque is proportional to the product of voltage and current in the respective coils at the corresponding instant, the constant of proportionality is the same as in the case of dc use.

Thus, the instantaneous value of the deflecting torque is proportional to the instantaneous power.
Owing to the inertia of the moving system, the pointer reads the average power.
In dc circuits, the power is given by the product of voltage and current, and hence the torque is directly proportional to the power.
Thus, the instrument indicates the power.

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State TRUE/FALSE for following statements with reference to the dynamometer type instruments: The scale is non-uniform. Air friction damping is used.a)Statement 1 and 2 both are falseb)Statement 1 and 2 both are truec)Statement 1 is false and Statement 2 is trued)Statement 1 is true and Statement 2 is falseCorrect answer is option 'C'. Can you explain this answer?

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State TRUE/FALSE for following statements with reference to the dynamometer type instruments: The scale is non-uniform. Air friction damping is used.a)Statement 1 and 2 both are falseb)Statement 1 and 2 both are truec)Statement 1 is false and Statement 2 is trued)Statement 1 is true and Statement 2 is falseCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about State TRUE/FALSE for following statements with reference to the dynamometer type instruments: The scale is non-uniform. Air friction damping is used.a)Statement 1 and 2 both are falseb)Statement 1 and 2 both are truec)Statement 1 is false and Statement 2 is trued)Statement 1 is true and Statement 2 is falseCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for State TRUE/FALSE for following statements with reference to the dynamometer type instruments: The scale is non-uniform. Air friction damping is used.a)Statement 1 and 2 both are falseb)Statement 1 and 2 both are truec)Statement 1 is false and Statement 2 is trued)Statement 1 is true and Statement 2 is falseCorrect answer is option 'C'. Can you explain this answer?.

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