A balanced Wheatsone bridge ABCD has the following arm resistances :

R_{AB} = 1 k$$\Omega$$ $$\pm$$ 2.1%; R_{BC} = 100 $$\Omega$$ $$\pm$$ 0.5%; R_{CD} is an unknown resistance; R_{DA} = 300 $$\Omega$$ $$\pm$$ 0.4%. The value of R_{CD} and its accuracy is

Two balanced three-phase loads, as shown in the figure, are connected to a $$100\sqrt 3 $$ V, three-phase, 50 Hz main supply. Given Z_{1} = (18 + j24) $$\Omega$$ and Z_{2} = (6 + j8) $$\Omega$$. The ammeter reading, in amperes, is _________. (round off to nearest integer).

The type of single-phase induction motor, expected to have the maximum power factor during steady state running condition, is

The frequencies of the stator and rotor currents flowing in the three-phase 8-pole induction motor are 40 Hz and 1 Hz, respectively. The motor speed, in rpm, is ________. (round off to nearest integer).