Electronics and Communication Engineering - Networks Analysis and Synthesis

46.
One commercial unit of energy is equal to
1 watt-sec
1 kilowatt-sec
1 kilowatt-hour
One watt-hour
Answer: Option
Explanation:

Consumers are charged on the basis of kWh of energy used.


47.
In figure which is correct at any time t
I = iR + iL
I = iR + iL iC
I = iR + iL - iC
I = iR - iL - iC
Answer: Option
Explanation:

As per KCL sum of currents entering a node is equal to sum of currents leaving the node.


48.
Two coupled coils with self inductances of 4 mH and 16 mH are connected in series. The maximum possible value of inductance can be
36 mH
20 mH
28 mH
64 mH
Answer: Option
Explanation:

Inductance = 4 + 16 + 24 x 16 = 36 mH.


49.
In using KCL it is necessary that current leaving a node is written as negative.
True
False
Answer: Option
Explanation:

It may be written as positive or negative as per convenience.


50.
A resistor is rated at 0.75 watt, 1 kΩ. Its current rating is
1 mA
27.386 mA
1.268 mA
5.393 mA
Answer: Option
Explanation:

0.75 = I2 x 1 x 1000 or I = 27.386 mA.