Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

None of these
The ac voltage lags the current by 90 degree
Combinations of resistance and inductive reactance provide any opposition to current flow
Inductive reactance provides the only opposition to current flow
Resistances provide the only opposition to current flow

ANSWER DOWNLOAD EXAMIANS APP

Electronic Principles
The core of an electromagnet is said to be in saturation when:

the core is permitted to move freely within the coil
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
frequent changes in the direction of current through the coil causes heating effects in the core material
None of these
an increase in current through the coil causes no further increase in the mmf

ANSWER DOWNLOAD EXAMIANS APP

Electronic Principles
What is a negative ion?

An atom that contains more electrons than protons
An atom that contains more electrons than neutrons
An atom that contains more protons than neutrons
An atom that contains more protons than electrons
None of these

ANSWER DOWNLOAD EXAMIANS APP

Electronic Principles
Which one of the following statements applies to common auto batteries?

Auto batteries are secondary dry-cell batteries
Auto batteries are primary dry-cell batteries
Auto batteries are primary wet-cell batteries
Auto batteries are secondary wet-cell batteries
None of these

ANSWER DOWNLOAD EXAMIANS APP