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GATE 2019: Electrical & Electronics Measurements Rapid Quiz 1

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Question 1

Consider the following statements regarding a low power factor wattmeter, compensating coil is employed in order to
A) Reduce the error caused by the eddy currents.
B) Compensate for the error caused by power loss in the pressure coil.
C) Neutralize the capacitance effect of pressure coil.
D) Compensate for the inductance of pressure coil.
Select the correct answer using the codes given below;

Question 2

A generator is supplying power to a load (load power factor is lagging), The angle of induced emf of generator is zero, so δ of load should be to make the power flow from source to load

Question 3

A single core cable has a conductor diameter of 2 cm and an overall diameter of 4 cm. If the resistivity of the insulating material is 8×108 megohm-cm while the length of the cable is 2km then calculate the insulation resistance of this cable?

Question 4

A flat diaphragm made of mild steel is 0.5 mm thick and has a diameter of 25 mm. Determine the pressure applied to the diaphragm, if the centre of the diaphragm is deflected by 0.03375 mm. For mild steel, Young’s modulus is 200 GN/m2 and Poisson’s ratio is 0.28.

Question 5

Estimate an angular deflection of the pointer for a current of 1Amps if an MI type ammeter with an full scale deflection of 60 degrees for a current of 1.2 Amps with the expression of inductance L =150 + 20 θ - 2θ23 μH where θ is in radians.

Question 6

A shunt-type ohmmeter uses a 3 mA basic d’Arsonval movement with an internal resistance of 20 Ω. The battery emf is 3 V. Calculate (a) value of the resistor in series with the battery to adjust the FSD, and (b) at what point (.percentage) of full-scale will 80 Ω be marked on the scale?
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Jan 8ESE & GATE EE