WorksheetsDC Motors Quiz
Total questions: 15
Worksheet time: 8mins
What type of current do DC motors convert into mechanical energy?
Alternating Current (AC)
Direct Current (DC)
Pulsating Current
Static Current
In a DC shunt motor, how are the field windings connected?
In a star configuration
In parallel with the armature
In series with the armature
In a delta configuration
What is the primary advantage of a DC shunt motor?
High starting torque
Good speed regulation
Low cost
Compact size
Which component in a DC shunt motor is responsible for generating torque?
Field Winding
Commutator
Armature Winding
Brushes
What happens to the speed of a DC shunt motor when the load increases?
Speed increases significantly
Speed becomes unpredictable
Speed decreases slightly
Speed remains constant
What is a common application for DC shunt motors?
Electric trains
Cranes and hoists
Lathe machines
Elevators
In a DC series motor, how are the field windings connected?
In series with the armature
In a delta configuration
In parallel with the armature
In a star configuration
What is the characteristic of the torque in a DC series motor?
Constant regardless of load
Proportional to the square of armature current
Proportional to armature current
Inversely proportional to load
Which of the following is a key characteristic of a DC series motor?
Good speed regulation
Constant speed
High starting torque
Low efficiency
What is a potential risk when operating a DC series motor without a load?
Overheating
Increased speed to dangerous levels
Electrical failure
Loss of torque
Which application is best suited for a DC series motor?
Electric trains
Conveyors
Lathe machines
Blowers and fans
What is the effect of increasing field resistance in a DC shunt motor?
Increases torque
Decreases speed
Increases speed
No effect on speed
What is the relationship between speed and load in a DC series motor?
Speed is independent of load
Speed remains constant
Speed decreases with load
Speed increases with load
Which component helps facilitate current flow to the rotating armature in a DC motor?
Resistor
Armature Winding
Commutator and Brushes
Field Winding
What is the primary difference in field connection between DC shunt and series motors?
Shunt motors have parallel connections
Both have the same connection
Series motors have parallel connections
Shunt motors have series connections
