問題一覧
1
the normally open contacts of the above relay would be which terminal contacts?
5 and 3 6 and 4
2
what could this switch be use for
high limit safety control on a furnace
3
what does this symbol represent
single pole double throw
4
what is another name for a schematic diagram
ladder
5
wiring and schematic diagrams are generally shown in the ____state
De-energized
6
what does this symbol represent
single pole single throw
7
what does point represent on the above diagram
24 volt control circuit power
8
how are relay coil rates
voltage and frequency
9
what does this symbol represent
close on rise in pressure switch
10
what could this switch be use for
both a and b
11
an example of a power consuming device would be a ____ while and examoke of a non power consuming device would be a _____
ligh bulb single pole single throw switch
12
what does this symbol represent
N.O contact
13
an ____ is the easiest diagram to use to follow a circuit. this diagram normally can be studied briefly and the circuit function should become obvious.
ladder diagram
14
what does point b represent on the above diagram
push button control circuit switch
15
what does this symbol represent
open on rise in level float switch
16
what could this switch be use for
high pressure cut out safety control
17
the continuity through a heat relay is checked using
ohmmeter
18
what does this schematic symbol represent
normally open disconnect switch
19
when a contactor coil is energized how much resistance should be measured between terminal L1 and T1
zero ohms
20
what does this symbol represent
double pole single throw
21
indentify the N.O contacts of this relay
1 and 3 9 and 11 6 and 7
22
what does this symbol represent
make on rise in level float switch
23
an electrical power consuming component
uses power and is normally wired in parallel
24
schematic diagram represent the ______of operation
Logical sequence
25
the best type of dwitch to detect airmovement is called
sail switch
26
select one
N.O start switch
27
an electrical diagram showing the approximate location of the components is called ________
pictorial diagram
28
what does this symbol represent
normally closed contact
29
how are schematic diagram generally read?
left to right
30
what does this symbol represent
sail/flow switch that make on rise
31
what does this symbol represent
double throw double throw
32
what does this symbol represent
relay coil
33
use above diagram what terminal are the coil powered from?
2 and 7