Question5:-The resistance of 9 ohm each are connected in delta. The value of
resistance in each phase of equivalent star is

A:-18 ohm

B:-6 ohm

C:-3 ohm

D:-4.5 ohm

Correct Answer:- Option-C

Question6:-The maximum value of mutual inductance of two inductively coupled
coils with self-inductance, t:=36mH and 1,=64mH is

A:-100 mH

B:-28 mH

C:-2304 mH

D:-48 mH

Correct Answer:- Option-D

Question7:-When two coils of equal self-inductance are connected in series in one
way the net inductance is 12 mH, and when they are connected in the other way,
the net inductance is 4 mH. The maximum value of net inductance when they are
connected in parallel in a suitable way is

A:-2 MH
B:-3 mH
C:-4 mH
D:-8 mH
Correct Answer:- Option-B

Question8:-A current of 4 A flows in an AC circuit when 100 V DC is applied to it,
whereas it takes 250 V AC to produce the same current the power factor of the
circuit is

A:-1

B:-0.7

C:-0.85

D:-0.4

Correct Answer:- Option-D

Question9:-The voltage across R and Lin a series RL circuit is found to be 20 V and
15 V respectively. The RMS value of the voltage across the series combination is

A:-20 V
6-۷7٦
6-۷
0-۷

Correct Answer:- Option-B