MATH QUIZ 1

Question 1

1. The decimal equivalent for the fraction “1/2” is _____.
   (a) 0.50
   (b) 0.70
   (c) 2
   (d) 5

Answer 1

A

Question 2

2. The approximate decimal equivalent for the fraction “4⁄18” is
\_\_\_\_\_.
(a) 0.20
(b) 2.50
(c) 3.50
(d) 4.50

Answer 2

A

Question 3

3. To change a percent value to a decimal or whole number, drop
   the percentage sign and move the decimal point two places to
   the _____.
   (a) right
   (b) left
   (c) depends
   (d) none of these

Answer 3

A

Question 4

4. The decimal equivalent for “75 percent” is _____.
   (a) 0.075
   (b) 0.75
   (c) 7.50
   (d) 75

Answer 4

A

Question 5

5. The decimal equivalent for “225 percent” is _____.
   (a) 0.225
   (b) 2.25
   (c) 22.50
   (d) 225

Answer 5

A

Question 6

6. The decimal equivalent for “300 percent” is _____.
   (a) 0.03
   (b) 0.30
   (c) 3
   (d) 30.00

Answer 6

A

Question 7

7. The method of increasing a number by another number is done
by using a \_\_\_\_\_\_.
(a) percentage
(b) decimal
(c) fraction
(d) multiplier

Answer 7

A

Question 8

8. An overcurrent device (circuit breaker or fuse) must be sized no
   less than 125 percent of the continuous load. If the load is 16A,
   the overcurrent device will have to be sized at no less than
   _____.
   (a) 17A
   (b) 20A
   (c) 23A
   (d) 30A

Answer 8

A

Question 9

9. The maximum continuous load on an overcurrent device is
   limited to 80 percent of the device rating. If the overcurrent
   device is rated 100A, the maximum continuous load is _____.
   (a) 72A
   (b) 80A
   (c) 90A
   (d) 125A

Answer 9

A

Question 10

10. The feeder calculated load for an 8 kW load, increased by 20
percent is \_\_\_\_\_.
(a) 8 kW
(b) 9.60 kW
(c) 10 kW
(d) 12 kW

Answer 10

A

Question 11

11. What’s the reciprocal of 1.25?
    (a) 0.80
    (b) 1.10
    (c) 1.25
    (d) 1.50

Answer 11

A

Question 12

12. A continuous load requires an overcurrent device sized no
    smaller than 125 percent of the load. What’s the maximum
    continuous load permitted on a 100A overcurrent device?
    (a) 75A
    (b) 80A
    (c) 100A
    (d) 125A

Answer 12

A

Question 13

13. Squaring a number means multiplying the number by itself.
    (a) True
    (b) False

Answer 13

A

Question 14

What’s the power consumed in watts by a 12 AWG conductor
that’s 100 ft long and has a resistance (R) of 0.20 ohms, when
the current (I) in the circuit is 16A?
Formula: Power = I2 x R
(a) 50W
(b) 75W
(c) 100W
(d) 200W

Answer 14

A

Question 15

15. What’s the approximate area in square inches of a trade size 2
    raceway?
    Formula: Area = π x r2, π = 3.14, r = radius (½ of diameter)
    (a) 1 sq in.
    (b) 2 sq in.
    (c) 3 sq in.
    (d) 4 sq in.

Answer 15

A

Question 16

16. The numeric equivalent of 42 is _____.
    (a) 2
    (b) 8
    (c) 16
    (d) 32

Answer 16

A

Question 17

17. The numeric equivalent of 122 is _____.
    (a) 3.46
    (b) 24
    (c) 144
    (d) 1,728

Answer 17

A

Question 18

18. What’s the maximum distance that two 14 AWG conductors can
    be run if they carry 16A and the maximum allowable voltage
    drop is 10V?
    D = (Cmil x Evd)/(2 x K x I)
    The cmil area of 14 AWG = 4,110 cmil [Chapter 9, Table 8]
    D = (4,110 Cmil x 10V)/(2 x 12.90 ohms x 16A)
    (a) 50 ft
    (b) 75 ft
    (c) 100 ft
    (d) 150 ft

Answer 18

A

Question 19

19. What’s the current in amperes of an 18 kW, 208V, three-phase
load?
Current: I = VA/(E x √3)
Current: I = 18,000W/(208V x 1.732)
(a) 25A
(b) 50A
(c) 100A
(d) 150A

Answer 19

A

Question 20

20. Deriving the square root of a number is almost the same as
    squaring a number.
    (a) True
    (b) False

Answer 20

A

Question 21

21. What’s the approximate square root of 1,000?
    (a) 3
    (b) 32
    (c) 100
    (d) 500

Answer 21

A

Question 22

22. The square root of 3 is _____.
    (a) 1.50
    (b) 1.732
    (c) 9
    (d) 729

Answer 22

A

Question 23

23. The volume of an enclosure is expressed in _____, and is
    calculated by multiplying the length, by the width, by the depth
    of the enclosure.
    (a) cubic inches
    (b) weight
    (c) inch-pounds
    (d) none of these

Answer 23

A

Question 24

24. What’s the volume (in cubic inches) of a 4 x 4 x 1.50 in. box?
    (a) 20 cu in.
    (b) 24 cu in.
    (c) 30 cu in.
    (d) 33 cu in.

Answer 24

A

Question 25

25. What’s the kW of a 75W load?
    (a) 0.075 kW
    (b) 0.75 kW
    (c) 7.50 kW
    (d) 75 kW

Answer 25

A

Question 26

26. The approximate sum of 2, 7, 8, and 9 is equal to _____.
    (a) 20
    (b) 25
    (c) 30
    (d) 35

Answer 26

A

Question 27

27. The output power of a transformer is 100W and the transformer
efficiency is 90 percent. What’s the transformer input if
the output is lower than the input?
Formula: Input = Output/Efficiency
(a) 90W
(b) 100W
(c) 110W
(d) 125W

Answer 27

A