Electrical Engineering- Electric Current and Ohm's Law
Electrical Engineering- Electric Current and Ohm's Law
71.
A cylindrical wire is compressed in length by 10%. The percentage decrease in the resistance will be
- 16%
- 19%
- 20%
- 25%.
73.
Ohm's law is not applicable in all the following cases except
- Electrolysis
- Arc lamps
- Insulators
- Vacuum radio valves.
74.
In which of the following circuits will the voltage source produce the most current?
- 10 V across a 10 ohm resistance
- 10 V across two 10 ohm resistance in series
- 10 V across two 10 ohm resistances in parallel
- 1000 V across Mohm resistance.
75.
A piece of sliver wire has a resistance of 1 ohm. A manganin wire has specific resistance 30 times that of silver. The resistance of a manganin wire of one fourth length and one third diameter will be
- 6 / 5 ohm
- 1 ohm
- 67.5 ohm
- 86.75 ohm.