Q.2 (a) Figure Q.2a shows a Permanent Magnet Moving Coil (PMMC). Reading scale Light Indicator a Mirror Iron Hair Core Spring N° Permanent magnet Coil Figure Q.2a State the components of the PMMC as described by the following statements based on Figure Q.2a. (i) Current flows in this component, causing it to experience a force and moves. (ii) This component opposes the deflection torque so that the pointer can come to rest at the point where the electromagnetic torque is equal to the control spring torque. (iii) This component makes the magnetic field radial and uniform and at the same time decreases the reluctance of air path between the poles and hence increases the magnetic flux. (iv) This component provides high field strength. (v) This component measures the angular deflection of the coil. (b) If the PMMC has 50 µA full scale deflection, what is the sensitivity? (c) The voltage in Figure Q.2c is measured using a voltmeter having a resistance of 20 kN. Find the percentage loading error. 20 kQ 20 kΩ 10 V Figure Q.2c
Q.2 (a) Figure Q.2a shows a Permanent Magnet Moving Coil (PMMC). Reading scale Light Indicator a Mirror Iron Hair Core Spring N° Permanent magnet Coil Figure Q.2a State the components of the PMMC as described by the following statements based on Figure Q.2a. (i) Current flows in this component, causing it to experience a force and moves. (ii) This component opposes the deflection torque so that the pointer can come to rest at the point where the electromagnetic torque is equal to the control spring torque. (iii) This component makes the magnetic field radial and uniform and at the same time decreases the reluctance of air path between the poles and hence increases the magnetic flux. (iv) This component provides high field strength. (v) This component measures the angular deflection of the coil. (b) If the PMMC has 50 µA full scale deflection, what is the sensitivity? (c) The voltage in Figure Q.2c is measured using a voltmeter having a resistance of 20 kN. Find the percentage loading error. 20 kQ 20 kΩ 10 V Figure Q.2c
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Transcribed Image Text:Q.2
(a) Figure Q.2a shows a Permanent Magnet Moving Coil (PMMC).
Reading scale
Light
Indicator
Mirror
Iron
Hair
Core
Spring
N°
Permanent
magnet
Coil
Figure Q.2a
State the components of the PMMC as described by the following statements based
on Figure Q.2a.
(i) Current flows in this component, causing it to experience a force and moves.
(ii) This component opposes the deflection torque so that the pointer can come to
rest at the point where the electromagnetic torque is equal to the control spring
torque.
(iii) This component makes the magnetic field radial and uniform and at the same
time decreases the reluctance of air path between the poles and hence increases
the magnetic flux.
(iv) This component provides high field strength.
(v) This component measures the angular deflection of the coil.
(b) If the PMMC has 50 µA full scale deflection, what is the sensitivity?
(c)
The voltage in Figure Q.2c is measured using a voltmeter having a resistance of 20
kN. Find the percentage loading error.
20 kN
20 k2
10 V
Figure Q.2c
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