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GATE-19: Electrical Measurement & Measuring Instrument Quiz-3
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Question 1
In order to have a high current sensitivity, the control-spring constant of the moving coil ammeter should be:
Question 2
The magnitude of pen deflection is proportional to which of the following in PMMC writing system.
Question 3
Determine the number of turns required to produce an angular deflection of 60° when a current of 4 mA flowing through the coil if a PMMC instrument have a coil of dimension 12 mm x 10 mm and the flux density in an air gap is 1.2 x 10-3 Tesla and the spring constant is 0.10 x10-6 N-m/rad.
Question 4
The PMMC ammeter A in the figure below has a range of 0 to 3 mA. When switch S is opened, the pointer of the ammeter swings to the 1 mA mark, returns and settles at 0.9 mA. The meter is:
Question 5
In an electrodynamic instrument the total resistance of the voltage coil circuit is 6800 Ω and the mutual inductance changes uniformly from -103 μH at zero deflection to +105 μH at full scale. The angle of full scale being 80 °. If a potential difference of 80 V is applied across the voltage circuit and a current of 2 A at a power factor of 0.45 is passed through the current coil, what will be the deflection. Spring constant of the instrument is 3.36 × 10-6 N-m/rad.
Question 6
The coil of PMMC meter has 60 turns on a forer i.e., 18 mm wide, the effective length of conductor being 25mm. It moves in a uniform field flux density of 0.5 tesla. The control spring constant i 1.5*10 -6 N-m/o. Calculate the current required to produce a deflection of 100 oc
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Jan 8ESE & GATE EE
