SSC JE Electrical Engineering 29th Jan 2018 Shift-2

Which elementin CRO is used to collect secondary emission electrons?

Instrument transformers are used in which typeofcircuits??

The range of moving coil instrument having meter resistance of 6 Ohms is 0-50 V. Find the value of multiplying factor of the series resistance,if full scale deflection current is 5A.

Meggeris used to measure resistance.

A 110 : 100 V, PT (potential transformer) is used along with a voltmeter whose reading is 24.5 V. Find the value of the high voltage to be measured.

The bridge shown in figure has $$Z_{1} = 50  \angle 10^\circ Ω, Z_{2} = 10 \angle 0^\circ Ω, Z_{3} =  150 \angle -10^\circ Ω$$. For what value of $$Z_{4}$$ the bridge will be balanced ?

In two-wattmeter method,if the balanced load is resistive, then the relation
between the two wattmeterwill be _____.

For a balance three phase circuit, two watt meter are connected to measure the  input power. The reading of two watt meter is 2000 W and 535.98 W respectively. Determine the  power factor of the circuit.

A permanent magnet moving coil instrument has a coil of dimension $$10 mm \times 20 mm$$. The flux density in the air gap is $$2 \times 10^{-3} Wb/m^2$$ and the spring constant is $$0.25 \times 10^{-6} Nm/rad$$. If the current of 10 mA is  flowing through the coil, then calculate the number of turns required to produce an angular deflection of 60 degrees.

A 60 A, 220 V energy meter makes 51 revolutions in 35 seconds on full load test. Calculate the percentage error (in %) if meter constant is 420 rev/kWh.