1
Q
with reference to induction motors state when a star delta starter would be used, describe the operation of a star delta starter
explain why the configuration is changed from star to delta
A
.
2
Q
with reference to battery lockers state the requirements for internal light fitting
explain why the requirements in part 1 are necessary
A
.
3
Q
Ex i
A
Intrinsically safe
4
Q
Ex e
A
Increased safety
5
Q
Ex d
A
Flameproof
6
Q
Ex n
A
Non-sparking
7
Q
Ex p
A
Pressurized
8
Q
Ex s
A
Special protection
9
Q
Temperature Class
A
T1 450 C T2 300 C T3 200 C T4 135 C T5 100 C T6 85 C This denotesthe maximumsurfacetemperatureof the equipmentundernormaland fault conditions
10
Q
Power in Watts=
A
Volts x Amps ( V x I ) or Watts / Volts
11
Q
One Horse power =
A
746 Watts
12
Q
1000 Watts is known as ?
A
One Kilowatt ( kw )
Engineering
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