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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...
Statement 1: The scale is non-uniform.
The statement is false. In dynamometer type instruments, the scale is generally uniform. The scale is a calibrated marking on the instrument that provides a visual representation of the measured quantity. In a dynamometer, the scale is typically evenly divided into equal intervals to represent the magnitude of the measured quantity.
Statement 2: Air friction damping is used.
The statement is true. Air friction damping is commonly used in dynamometer type instruments. Damping is the process of reducing the oscillations or vibrations of the instrument's moving parts, allowing for a more accurate and stable measurement. In air friction damping, the motion of the instrument's moving parts is opposed by the resistance offered by the surrounding air. This resistance helps to dampen the oscillations and bring the moving parts to rest quickly, allowing for more precise readings.
Explanation:
The given statements are:
1. The scale is non-uniform.
2. Air friction damping is used.
From the explanation provided above, we can conclude that:
- Statement 1 is false because the scale in dynamometer type instruments is typically uniform.
- Statement 2 is true because air friction damping is indeed used in dynamometer type instruments.
Hence, the correct answer is option C - Statement 1 is false and Statement 2 is true.
The statement is false. In dynamometer type instruments, the scale is generally uniform. The scale is a calibrated marking on the instrument that provides a visual representation of the measured quantity. In a dynamometer, the scale is typically evenly divided into equal intervals to represent the magnitude of the measured quantity.
Statement 2: Air friction damping is used.
The statement is true. Air friction damping is commonly used in dynamometer type instruments. Damping is the process of reducing the oscillations or vibrations of the instrument's moving parts, allowing for a more accurate and stable measurement. In air friction damping, the motion of the instrument's moving parts is opposed by the resistance offered by the surrounding air. This resistance helps to dampen the oscillations and bring the moving parts to rest quickly, allowing for more precise readings.
Explanation:
The given statements are:
1. The scale is non-uniform.
2. Air friction damping is used.
From the explanation provided above, we can conclude that:
- Statement 1 is false because the scale in dynamometer type instruments is typically uniform.
- Statement 2 is true because air friction damping is indeed used in dynamometer type instruments.
Hence, the correct answer is option C - Statement 1 is false and Statement 2 is true.
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Community Answer
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:
Td ∝ V I1
Where,
Td ∝ 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:
Td ∝ 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.
Td ∝ 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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