Ramsay Test Motors and Controls

Question 1

What does the abbreviation 'FLA' mean on an electric motor nameplate?

Accepted Answer

Full Load Amperes

Answer

Frequency Load Adjustment

Answer

Full Line Amps

Answer

Forward Load Amps

Question 2

What is the synchronous speed of a 4-pole AC induction motor connected to a 60 Hz power supply?

Accepted Answer

1800 RPM

Answer

3600 RPM

Answer

900 RPM

Answer

1200 RPM

Question 3

A squirrel cage induction motor gets its name from the design of which component?

Accepted Answer

The rotor, which uses aluminum or copper bars short-circuited at both ends

Answer

The stator, which is wound with insulated copper coils

Answer

The end bells, which are shaped like a cage for ventilation

Answer

The capacitor bank, which resembles a cage structure

Question 4

What is the primary purpose of the overload relay in a motor starter?

Accepted Answer

To protect the motor from damage caused by sustained overcurrent

Answer

To limit the inrush current during motor startup

Answer

To regulate motor speed under varying load conditions

Answer

To provide short-circuit protection for the motor branch circuit

Question 5

A three-phase motor that was running normally suddenly begins running at reduced speed under full load. What is the most likely cause?

Accepted Answer

One phase of the three-phase supply has been lost (single-phasing)

Answer

The motor's cooling fan has failed

Answer

The supply voltage is too high

Answer

The motor bearings have seized partially

Question 6

On a dual-voltage motor, the high-voltage connection wires the stator coils in which configuration?

Accepted Answer

Series, providing higher impedance and lower current draw

Answer

Parallel, providing higher voltage with increased current draw

Answer

Delta, providing lower voltage and higher current

Answer

Wye, providing the highest available voltage

Question 7

What does a motor's 'service factor' (SF) indicate on the nameplate?

Accepted Answer

A multiplier showing how much above rated load the motor can carry intermittently without damage

Answer

The recommended maintenance interval in operating hours

Answer

The percentage of time the motor can run at full load continuously

Answer

The maximum ambient temperature rating for safe operation