666

Question 1

If asked to get a 1200 HMI par unit what items would you bring?

Answer 1

Head w/barn doors 
Scrims 
2 headers 
Ballast
Lens set
Stand (whichever one is asked for)
single

Question 2

List the following bases from smallest to largest?

Mogul
Medium
Candelabra
Intermediate

Answer 2

1 - Candelabra (E12 = 12mm)
2 - Intermediate (E17)
3 - Medium/standard (E26)
4 - Mogul (E39)

Question 3

What is the definition of harmonic balance?

Answer 3

A method used to calculate the steady-state response of nonlinear differential equations, and is mostly applied to nonlinear electrical circuits

(Google “power factor correction” and “capacitive and inductive reactance”)

(Our lord and savior has assured me this isn’t on the test)

Question 4

What is an ohmmeter?

Answer 4

Electrical instrument that measures electrical resistance, (the opposition to an electric current)

Question 5

In a 120v/240v single phase electrical system, how many “hot legs” are there?

Answer 5

2

sometimes 1

Question 6

What is the main difference between a Delta and WYE system?

Answer 6

A load placed on 2 phases in a WYE = 208v

Load placed on 2 phases in a Delta = 240v

Question 7

What is the voltage rating on cables we use?

Answer 7

600 volts

12/3 - 18/2 = 300 volts

Question 8

Standard wire gauges not in motion pictures?
22
16
18
2/0
12
4/0
#2
#6
#4

Answer 8

22

Question 9

List the wattages for the following:
PH 211
PH 212
PH 213
ECT
BCA
EBW
BBA
ECA

Answer 9

PH 211 – 75
PH 212 – 150
PH 213 – 250
ECT – 500
BCA – 250
EBW – 500
BBA – 250
ECA – 250

Question 10

What do each of these letters represent?
E
R
I
W

Answer 10

E = volts
R = ohms (resistance)
I = amps
W = watts

Question 11

List 4 gel types

Answer 11

CTS, CTO, CTB, Minus Green

Plus Green, Neutral Density, Heat shield, Diffusion

Question 12

You have a 480v AC electrical service with a 400a 3-phase step down to 208v AC. What is your available amperage?

Answer 12

800 amps????

step down = double amps

(double check this)

(480 x 400 / 208 = 923.1)

Question 13

The art dept designs a set piece with 2000 25w household bulbs. When on location you have a 350a power plant. Will it work? Why?

Answer 13

2000 x 25 = 50,000

50,000/120 = 417

350 < 417

No, not enough amps to power the many bulbs

[(350 x 120)/25 = 1,680 bulbs could potentially be powered]

Question 14

Name 4 types of meters

Answer 14

voltage, light, ohmmeter, frequency (Hz)

Color temperature meter, amp probe,

Question 15

Why is DC safer near water?

Answer 15

• DC needs 2 points, AC just needs one point and finds it’s ground
• AC gets you stuck, DC blows you off

DC does not have alternating polarity of voltage
AC can hit peaks up 170, DC stays constant
AC changes directions periodically

Question 16

List 3 genny instruments

Answer 16

Hz, volts, amps

water temp, oil pressure, fuel