Page 267 - Basic Electrical Engineering
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27. Two resistances when connected in parallel across a 6 V battery draws a total current of 6 A.
When one of the resistances is disconnected, the current drawn becomes 3 A. The resistances
are of values
a. 1 Ω and 1 Ω
b. 2 Ω and 2 Ω
c. 6 Ω and 6 Ω
d. 3 Ω and 2 Ω.
28. Two resistances, 40 Ω and 10 Ω are connected in parallel and the combination is connected in
series with a 2 Ω resistor. When the whole network is connected across a 100 V supply, the
current drawn by the network will be
a. 10 A
b. 1.92 A
c. 20 A
d. 2.2 A.
29. Three resistance of 20 Ω each are connected in star. The resistance of each branch of the
equivalent delta will be equal to
a. 40 Ω
b. 60 Ω
c. 400 Ω
d. 6.67 Ω.
30. Three resistances of 10 Ω each are connected in delta. The value of each of resistance of the
equivalent star will be equal to
a. 6.67 Ω
b. 3.33 Ω
c. 30 Ω
d. 10 Ω.
31. The equivalent resistance of the network across terminals A and B, as shown in Fig. 2.190,
will be
Figure 2.190
a. 10 Ω
b. 20 Ω
