Review Questions (Transformers)

If there are 20 turns in the primary and only 10 in the secondary and the transformer operates at 120V, the voltage in the secondary is ____.

60V

The least efficient type of transformer is the ____.

Open Core

Capacitor circuit conductors must have an ampacity of not less than ____.

135% of the rated current of the capacitor

Dry-type transformers rated at 112.5 kVA or less may be located out in the open provided they are separated from combustible material by a distance of ____.

12” (300mm)

If the power factor is improved by the addition of a capacitor, the motor running overcurrent device must be selected based on the ____.

reduced current

Except for motor starting service, insulated conductors used for connections between resistors and motor controllers must be rated at not less than ____.

90°C (194°F)

A transformer reads zero volts across the output terminals. The cause is most likely ____.

an open circuit

When performing maintenance on dry-type transformers, check for cracked insulators on transformers over ____.

1000V