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WorksheetsDC Motors
Total questions: 20
Worksheet time: 13mins
A motor is operating a load that requires 26 lb-ft of torque and is turning at a speed of 1,000 RPM. What is the HP output of the motor?
6.25 hp
7.62 hp
4.95 hp
5.26 hp
A motor rated at 100v 8a & 1 hp. What is the efficiency of the motor?
73.65%
87.62 %
100 %
93.25%
Which of the following is equal to one horsepower ?
550 lb-in/s
746 NM/s
33000 lb-ft/m
All of these answers are correct
Which DC motor wiring configuration is known to provide the best torque?
Horse
Compound Motor
Shunt motor
Series Motor
What is the proper terminal identification for a DC series motor?
A1,A2, S1,S2
R1,R2, F1,F2
A1,A2, F1,F2
A1,A2, S1,S2
R1,R2, F1,F2
A1,A2, F1,F2
L1,L2, S1,S2
A DC motor is connected to a 285v DC source and has a current draw of 25.5 A. The motor has a HP of 7.14 hp. What is the efficiency of the motor?
83.49 percent
73.29 percent
92.67 percent
68.52 percent
The Armature is the ________ part of the motor
Stationary
Field Winding
Rotating
Permanent Magnet
The torque of a DC motor is affected by the number of _______ in the armature.
Loops
Permanent Magnets
Pixies
RPMs
The motor that does not contain a wound armature, commutator, or brushes is the _____ motor.
Servo
Squirl Cage
Brushless
Permanent Magnet
A motor is operating a load that requires 28 lb-ft of torque and is turning at a speed of 1,150 RPM. What is the HP output of the motor?
6.13 hp
7.48 hp
5.64 hp
6.99 hp
What type of motor configuration should be avoided?
Steam Powered Motor
Differential Compound Motor
Any Motor! I only do plugs and switches
600v motors... I'm scared
What is this motor configuration?
Long Shunt
Short Shunt
Series
Shunt
A DC motor is connected to a 265v DC source and has a current draw of 27.0 A. The motor has a HP of 6.71 hp What is the efficiency of the motor?
69.96 percent
96.69 percent
72.56 percent
84.39 percent
When changing the direction of a DC motor it is best to change the polarity of the _______
Shunt Field
Series Field
Armature
Input Power
What is 24kilowatts in horsepower?
32.17 hp
42.63 hp
36.56 hp
39.89 hp
What is 20hp in in watts?
16.97 kw
4.94 kw
14.92 kw
22.65 kw
A commutator acts like a mechanical _______
Replicator
Bull
Engineer
Inverter
This type of field is made up of a few turns of larger gauge wire
Shunt
Series
Soccer
Football
The contacts of a field loss relay will open when the voltage drops below a certain level in which field?
Shunt Field
Series Field
Armature's Magnetic Field
CEMF Field
One method of speed control has us install a Shunt Field ______ connected in series, which reduces field current, increases armature current, and increases speed
Relay
Flux Capacitor
Contact
Rheostat
