ESCO ELECCRICTY EXAM Part 1

1. What voltage is across the condenser fan mot? You are assuming that the system is operational, and the blower motor is set to auto.

• 240

• 120

• 140

• 300

 What is not controlling line 11?

• Line 11 in the low voltage area is not controlling the blower motor

• Line 12 in the low voltage area is not controlling the blower motor

• Line 11 in the low voltage area is controlling the blower motor

• Line 2 in the high voltage area is not controlling nothing

During troubleshooting you find that the thermostat is calling for cooling, but condenser fan motor and compressor are short cycling. The blower motor is not running. What might be the problem with this system? 

• The problem might be created by a faulty blower relay. If the blower is not working the low pressure in the system will drastically drop

• The problem might be created by a capititor . If the blower is not working the low pressure in the system will drastically drop

• There is no problem

Tags

NGSS.HS-PS3-4

 System thermostat contacts are closed calling for cooling, but the condenser fan motor and compressor are not running. The blower motor is running. What could be the cause?

• This can be created by a faulty contactor coil

• Bad contactor

• Bad transformer

 What would happen if you connected a contactor coil in series with other loads? 

• It is going to work good.

• It is not going to work

• You don't know what would happen.

What is T1, T2, T3 on a motor starter? 

• 1,L2,L3 are power supply to contactor or starter. T1,T2,T3 are load connections.

• 1,L2,L3 are power supply to contactor or starter. T1,T2,T3 are load connections.

What can create an excessive current draw?

• Short circuits

• Long circuits

• Bad circuit flow

 By looking at your schematic when do you think the crankcase heater will operate?

• Crankcase heaters are energized when the compressor is de-energized. 

• When crankcase heaters are flowing in the right way

Tags

NGSS.MS-PS3-3

What is a relay

• Relays are very small contactors that control inductive loads less than 10 amps.

• Relay is a circuit component that temporarily stores electrical energy through distributing charged particles

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What should you do when reading a capacitor

• the meter should; measure low resistance then return to a high reading.

• the meter should; measure high resistance then return to a high reading.

• the meter should read nothing