1. When a DC motor starts, the generated counter emf across the armature is low.
a. True
b. False
2. A field accelerating relay is used with starters to control low-cost speed motors.
a. True
b. False
3. A field failure relay is a single-pole control relay.
a. True
b. False
4. Time limit acceleration has the disadvantage that the resistors might remain in the circuit and could burn out.
a. True
b. False
5. Time limit controllers can drive pumps, fans, and compressors.
a. True
b. False
Name: Class: Date:
Unit 46 Compensating and Definite Time Control Starting
6. A heavy load has more inertia for the motor to overcome; therefore, ____ is required to build up the counter emf.
a. a longer time b. more voltage
c. a shorter time d. less voltage
7. The field accelerating relay ____ the full field during the starting period and limits the armature current during
sudden speed changes.
a. displaces b. restricts
c. provides d. blocks
8. The definite time limit acceleration provided by the timing relays means that the resistors remain in the line for a
fixed time period ____ the motor is connected across the line.
a. after b. before
c. while d. if
9. The running contactor is closed ____ after a definite time interval.
a. completely b. partially
c. automatically d. manually
10. Time limit controllers can be used with series, shunt, or ____ wound DC motors.
a. split b. advanced
c. permanent d. compound
Name: Class: Date:
Unit 46 Compensating and Definite Time Control Starting