DC Motors

What formula is used to calculate the magnitude of the force exerted on a current-carrying conductor in a magnetic field?

• F=B×I×L

• F=B+I-L

• F=B/I×L

• F=B-I+L

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which law is used to find the direction of force in electric motors?

• Fleming’s right-hand law

• Ohm's law

• Newton's second law

• Fleming’s left-hand law

Tags

NGSS.HS-PS3-5

What are the two main windings found in a d.c. motor?

• Inductor winding and resistor winding

• Rotor winding and stator winding

• Primary winding and secondary winding

• Field winding and armature winding

Tags

NGSS.HS-PS3-5

What type of d.c. motor is known for having high starting torque?

• Parallel-wound motor

• Shunt-wound motor

• Series-wound motor

• Compound-wound motor

Which d.c. motor has a relatively constant speed regardless of the load?

• Series-wound motor

• Compound-wound motor

• Shunt-wound motor

• Parallel-wound motor

What characteristic does a compound-wound motor combine?

• High starting torque and good speed regulation

• Low starting torque and constant speed

• Low starting torque and high speed regulation

• High starting torque and low speed regulation

Tags

NGSS.HS-PS3-5

What formula is used to calculate the magnitude of the EMF produced in a moving conductor cutting a magnetic field?

• E=B/L+v

• E=B-L-v

• E=B×L×v

• E=B+L×v

What type of d.c. generator has its field winding supplied from an independent external d.c. source?

• Self-excited d.c. generator

• Series-wound generator

• Shunt-wound generator

• Separately excited d.c. generator

In which type of d.c. generator is the field winding connected in series with the armature winding?

• Series-wound generator

• Shunt-wound generator

• Compound-wound generator

• Separately excited generator

What is a characteristic of a shunt-wound generator?

• It has high starting torque

• It is supplied from an external d.c. source

• It has many turns of fine wire having high resistance

• It is mainly used for boosters

Tags

NGSS.HS-PS3-3