 # Electrical Engineering Objective Questions { Electrical And Electronic Measurement }

267. The primary current in a current transformer is dictated by

268. A sinusoidal source of voltage V and frequency f is connected to a series circuit of variable resistance, R and a fixed reactance,X. The locus of the tip of the current-phasor, I, as R is yarded from 0 to 00 is

269. A d.c. voltmeter has a sensitivity of 1000 0./volt. When it measures half full scale in 100V range, the current through the voltmeter is

270. A moving coil galvanometer is made into a d.c. ammeter by connecting

271. Electrodynamic type wattmeters have large errors while measuring power in ac circuit at low power factor conditions, since the voltage across and the current through the

272. The two wattmeter method is used to measure active power on a three phase, three wire system. If the phase voltage is unbalanced, then the power reading is

273. The minimum number of wattmeter (s) required to measure 3-phase, 3-wire balanced or unbalanced power is

Page 39 of 44