monthly Test TT Electrician March 2025

what does AC stands for ?

• alternating charge

• Ampere current

• alterning current

• Automatic current

IN Ac the direction of current flow :

• is always in one direction

• periodically reverses direction

• depends on the voltage source

• cannot be determined

What does the peak voltage of an Ac wave form represent ?

• square wave

• triangular wave

• sine wave

• sawtooth wave

Which component in an AC circuit primarily opposes current changes due to it's inductance ?

• capacitor

• Resistor

• Inductor

• Diode

What is the primary function of a capacitor in an AC circuit?

• To store energy in a magnetic field

• To store energy in electric field

• To resist current flow

• To generate voltage

The formula for calculating apparent powerin an ac circuit is:

• P=VIcos@

• P=VI

• P=VIsin@

• P=V2/R

what does a "power factor" of 1 indicate in an ac circuit ?

• The current is lagging in the voltage

• the current is leading in the voltage

• Thr current is in phase with the voltage

• Thr current is purely reactive

The inductance of the coil can be increased by

• incresing core length

• decreasing the number of turns

• Decreasing the diameter of the former

• Choosing core material having high relative permeability

Power facor of an electric circuit is equal to

• R/Z

• cosine of phase angle difference between current and voltage

• Ratio of useful to tatal current

  Iw/l

• all above

The ratio of active power to apparent power is known as a factor.

• Demand

• Load

• Power

• Form