Electrical Engineering Questions and Answers


21)

If there is 6 A of current through the filament of a lamp, how many coulombs of charge move through the filament in 1.75 s?


Answer: Option A

Explanation:

Charge(Q) = current/time(sec)=i/t
so i = Q/t
Q = i*t=(6*1.75)
Q = 10.5

22)

A multimeter measures


Answer: Option D

23)

A material that does not allow current under normal conditions is a(n)


Answer: Option A

24)

The colored bands for a 4,700 ohm resistor with a ten percent tolerance are


Answer: Option C

Explanation:

BLACK-0
BROWN-1
RED -2
ORANGE-3
YELLOW-4
GREEN-5
BLUE -6
VIOLET-7
GREY -8
WHITE-9

The first band gives the first digit.
The second band gives the second digit.
The third band indicates the number of zeros.
The fourth band is used to shows the tolerance (precision) of the resistor

4700 means,

4 =yellow
7 =violet
00 =red(10^2)
Ten percent tollerance =silver
So, =4700.

25)

Eight-tenths coulomb passes a point in 4 s. The current in amperes is


Answer: Option D

Explanation:

Q = 8/10 given;
t = 4 s

Now current i = Q / t 
i = (8/10)/4
i = 2/10;
i = 0.2 A