Title: DC Motors
Course: Basic of Motor Theory (IC 105-IC 105) > Section: Assessments

Q: A __________ motor has the advantage of high torque and constant speed.
- DC series
- DC shunt
- DC compound
A: DC series

Q: A benefit of CEMF is that it causes speed regulation.
- True
- False
A: True

Q: A DC series motor has ___________ speed regulation.
- poor
- fair
- good
A: poor

Q: Arcing between brushes and the commutator is caused by armature reaction.
- True
- False
A: True

Q: As a motor is stalled, the torque it produces will ___________.
- increase
- decrease
A: increase

Q: If the armature of a DC motor is rotating in a clockwise direction, it will _____________ after the power leads are reversed.
- come to a stop
- come to a stop, then start turning counterclockwise
- continue running clockwise
- come to a stop and vibrate
A: come to a stop

Q: If the field coil of a DC shunt motor is opened, the armature speed will ________________.
- increase
- decrease
- stay the same
A: increase

Q: If the field coil of a shunt motor opens, the speed of the shaft will ____________.
- slow down
- speed up
- stay the same
A: slow down

Q: If the strength of the main field increases, the CEMF developed in the armature will ______________.
- increase
- decrease
- stay the same
A: increase

Q: The ____________ DC motor has the highest starting torque.
- series
- shunt
- compound
A: series

Q: The diameter of a pulley driven by a motor shaft ___________ have an influence on how much torque the motor supplies to the load.
- does
- does not
A: does

Q: The direction of rotation of a DC motor is changed by reversing the __________.
- brush position
- supply polarity
- field and armature connections
- field or armature connections
A: brush position

Q: The field coil of a series DC motor has _______________.
- many windings using fine wire
- few windings using thick wire
A: many windings using fine wire

Q: The shunt motor has ______________ speed regulation.
- poor
- fair
- good
A: poor

Q: Torque can be produced by a motor when its shaft is not turning.
- True
- False
A: True

Q: Which of the following conditions will cause a DC series motor to develop into a runaway condition?
- the armature coil opens
- the field coil opens
- the physical load which it drives becomes diconnected
A: the armature coil opens

Q: Identify the DC motor type.
- series
- shunt
- compound-differential
- compound-cumulative
A: series

Q: Identify the motor leads as A1, A2, S1, S2, F1, F2
A: 1 = A1; 2 = A2; 3 = F1; 4 = F2

Q: The expected reading of DMM1 with the motor Off, is __________ VDC.
A: 0

Q: The expected reading of DMM2 with the motor running at full speed is ___________ VDC.
A: 90