Title: Unit 6 Quiz
Course: HET 194 NATE Certification Preparation - Spring 2015 > Section: HET 194 NATE Certification Preparation - Spring 2015

Q: A motor's speed is determined by ____.
- size
- voltage
- amperage
- number of motor poles
A: number of motor poles

Q: Start windings are placed ____ with the run windings.
- 180 degrees out of phase
- in phase
- slightly out of phase
- in series
A: slightly out of phase

Q: The start windings have ____.
- fewer turns than the run windings
- more turns than the run windings
- the same number of turns as the run windings
- larger diameter wire than the run windings
A: more turns than the run windings

Q: When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a ____.
- circuit board
- capacitor
- centrifugal switch
- dual voltage switch
A: centrifugal switch

Q: When a Capacitor Start, Capacitor Run (CSCR) motor initially starts, what is the total capacitance acting on the motor? (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads, if present.)
- 4 microfarads
- 5 microfarads
- 20 microfarads
- 25 microfarads
A: 25 microfarads

Q: Capacitors wired in series with the starting winding provide a(n) ____.
- longer starting time
- greater starting torque
- aid in starting three phase motors
- more efficient operation at full load speed
A: greater starting torque

Q: The shaded pole motor ____.
- has little starting torque
- has excessive starting torque
- has greater efficiency than most split-phase motors
- will start against a heavy starting load
A: has little starting torque

Q: Three phase motors have ____.
- three start and three run windings for each phase
- one start and one run winding for each phase
- run windings only
- a start switch in each phase circuit
A: run windings only

Q: The starting device usually used on single phase, fractional horsepower motors requiring low starting torque is the ____.
- Truepotential relay
- current relay
- centrifugal switch
- differential relay
A: current relay

Q: The positive temperature coefficient resistor start device is a type of ____.
- capacitor
- variable resistor
- switching device
- diode
A: variable resistor