AC CIRCUITS

Which is not the property of AC quantity_____

• frequency

• rms value

• peak value

• none

time period is ____________

• the time taken for half cycle

• the time taken for one full cycle

• the time taken for two cycles

• the time taken for 50 cycles

if the frequency of ac voltage is 100hz , then the time period is __________

• 0.01sec

• 10ms

• 100ms

• both 1 and 2

frequency is defines as (a)  

RMS value of ac voltage V(t)= 100sin(330t) is __________

• 70.7

• 707.7

• 7.07

• 0.707

In a RL series circuit the impedance is _____

• $\sqrt{r^2+X^2}$

• $\sqrt{r^2-x^2}$

• $r^2+x^2$

• $r^2-x^2$

In RC series circuit current is _____________ the voltage

• 90 deg leading

• 90 deg lagging

• 180 deg leading

• less than 90 deg leading

In three-phase system, the three voltages (currents) differ in phase by __________electrical degrees from each other in a particular sequence.

• 30

• 60

• 90

• 120

Power in a Three Phase Circuit = _________.

• P = 3 VPh IPh CosФ .

• P = √3 VL IL CosФ

• Both 1 & 2

• None of The Above

n a circuit containing R, L and C, power loss can take place in___________

• c only

• L only

• r only

• all the above