Review unit 6 part-3

In a snap action overload relay, what happens to the bimetallic strip when heated?

• Form into a curved disc

• Form into a plate disc

• Form into a spiral disc

• Form into a straight disc

What happens to a bimetallic temperature switch with snap action if it will be used to make or break large currents needing fast overload response?

• The respond quickly

• The strip is bonded together

• They arc and burn

• They are fast to react

Refer to figure below. Identify the operating mechanism of magnetic starter?

• Clapper type

• Horizontal action type

• Bell crank type.

• Mechanical Linkage

Refer to figure below. Identify the operating mechanism of magnetic starter?

• Clapper type

• Horizontal action type

• Bell crank type

• Mechanical Linkage

Refer to figure below. Identify the operating mechanism of magnetic starter?

• Clapper type

• Horizontal action type

• Bell crank type.

• Mechanical Linkage

Using the table , what will be the NEMA starter size for a single phase motor with 15 HP and 240 V?

• 2

• 3

• 4

• 5

Using the table in Figure 33, what will be the NEMA starter size for a single phase motor with 7 1/2 HP and 208 V?

• 2

• 3

• 4

• 5

Using the table in Figure 33, what will be the NEMA starter size for a 3 phase motor, 200 HP and 480 V?

• 2

• 3

• 4

• 5

Using the table in Figure 33, what will be the NEMA starter size for a 3 phase motor, 50 HP and 240 V?

• 2

• 3

• 4

• 5

Refer the schematic diagram below .what is the eliminate used to keep the start button is holding circuit?

• magnetic starter coil

• Overload contacts

• Auxiliary contact

• Latching relay