L2 week3

Question 1

Degree

Answer 1

Angular measurement equal to 1/360 of the circumference of a circle.

Question 2

Radian (rad):

Answer 2

Angle formed when the distance along the circumference of a circle equal the radius of the circle.

Question 3

PI:

Answer 3

The ratio of the circumference of a circle to its diameter. Has a constant value ≈ 3.1416

Question 4

Angular measurements can be made in

Answer 4

degrees or radians.

Question 5

There are …… or …… radians in one complete revolution.

Answer 5

360 or 2pi

Question 6

rad =

Answer 6

(pi/180)*degree

Question 7

degree=

Answer 7

(180/pi)*rad

Question 8

The positive amplitude in the sine wave is equal to

Answer 8

90 degree

pi/2

Question 9

the middle of the sine wave is equal to

Answer 9

180 degree

pi

Question 10

the negative amplitude in the sine wave is equal to

Answer 10

270 degree

3pi/2

Question 11

Phase:

Answer 11

Angular measurement that specifies the position on the sine wave relative to a reference point.

Question 12

Sine wave shifted right

Answer 12

lags (-ve phase shift)

Question 13

Sine wave shifted left

Answer 13

leads (+ve phase shift)

Question 14

Phase shift

Answer 14

Occurs when a sine wave is shifted right or left in relation to the base/reference sine wave.

Question 15

An important application of phase-shifted sine waves is in

Answer 15

electrical power systems

Question 16

Electrical utilities generate ac with three phases that are separated by

Answer 16

120 degrees