NETA III exam questions with correct answers

NETA III exam questions with correct
answers

What is the approximate sum of the following two vectors? Magnitude 23 at 62° and magnitude 17 at
k k k k k k k k k k k k k k k k k




10°.
k




magnitude 40 at 72° k k k k




k magnitude 5 at 52° k k k k




k magnitude 40 at 52° k k k k




k magnitude 36 at 40° - ANSWER: ➡ magnitude 40 at 72***
k k k k k kk k k k k




Which is the correct definition of THD as put forth in IEEE 1159?
k k k k k k k k k k k k




k THD is the power factor under the condition of no load.
k k k k k k k k k k k




k THD is the total hysteresis distortion of a selected transformer.
k k k k k k k k k k




k THD is the ratio of the rms of the harmonic content to the rms value of the fundamental quantity,
k k k k k k k k k k k k k k k k k k




k expressed as a percent of the fundamental.
k k k k k k k




k THD is the total rms harmonic current distortion, in percent of the maximum demand load current (15
k k k k k k k k k k k k k k k k




k or 30 min demand). - ANSWER: ➡ THD is the total rms harmonic current distortion, in percent of the
k k k k k kk k k k k k k k k k k k k




k maximum demand load current (15 or 30 min demand).***
k k k k k k k k




When power is interrupted in a health care facility, what is the maximum amount of time allowed
k k k k k k k k k k k k k k k k




before power should restored by an alternate source?
k k k k k k k k

,k 5 seconds
k k




k 10 seconds
k k




k 30 seconds
k k




k 60 seconds - ANSWER: ➡ 5 seconds***
k k k kk k k




Temporary protective grounds should be placed to create an equipotential zone ______.
k k k k k k k k k k k




k if concern for unexpected re-energization exists
k k k k k k




k on the incoming lines
k k k k




k near each energy source
k k k k




k at the work location
k k k k




k before any testing is performed - ANSWER: ➡ if concern for unexpected re-energization exists ***
k k k k k k kk k k k k k k k




In a circuit containing resistance and inductance, the time required for current to reach its full value
k k k k k k k k k k k k k k k k




involves which of the following?
k k k k k




k R/L k




k R2 k

, k R/C k




k L/R - ANSWER: ➡ L/R***
k k kk k




An internal fault in a transformer can be discovered earliest using which test method?
k k k k k k k k k k k k k




k Interfacial tension k k




k Visual condition k k




k Power-Factor k




k Dissolved-gas analysis k k




k Oxygen Content - ANSWER: ➡ ***dissolved-gas analysis
k k k kk k k




Which of the following is grounded in a 3-phase, 4-wire wye connected system having a voltage range
k k k k k k k k k k k k k k k k




between 50V and 1000V:
k k k k




k Neutral Conductor k k




k Mid point of one phase winding
k k k k k k




k One phase conductor
k k k




k None of the above - ANSWER: ➡ neutral conductor***
k k k k k kk k k