A A speaker
B A dc generator
C A relay
D A solenoid

# Q2: Which two values are plotted on a B-H curve graph?

A Reluctance and flux density
B Permeability and reluctance
C Magnetizing force and permeability
D Flux density and magnetizing force

A armature
B field winding
C commutator
D brush

# Q4: The Hall effect

A is a phenomenon with no practical applications
B is used in various sensor applications
C can develop potentials of thousands of volts
D is the basis for solar cell operation

A Voltage
B Current
C Resistance
D Conductance

# Q6: A Hall effect sensor

A exists only in theory
B is a noncontacting magnetic sensor
C can operate only a few times before failure
D produces very large voltages

A
12,000 T
B
83,330 T
C
0 T
D

A A speaker
B A dc generator
C A relay
D A solenoid

# Q9: The polarity of induced voltage while a field is collapsing is

A independent of the force creating the field
B opposite to the force creating the field
C identical to the force creating the field
D present only if the force is stationary

# Q10: The Hall effect

A is a phenomenon with no practical applications
B is used in various sensor applications
C can develop potentials of thousands of volts
D is the basis for solar cell operation

# Q11: The unit of flux density is known as

A magnetomotive force
B a weber
C a maxwell
D a tesla

A
833.33 µAt/Wb
B
0.27 At/Wb
C
1200 At/Wb
D

A A speaker
B A dc generator
C A relay
D A solenoid

A
833.33 µAt/Wb
B
0.27 At/Wb
C
1200 At/Wb
D

# Q15: "Series" and "parallel" as applied to dc motors refer to

A the connection of the motor and controller
B the connection of the field coil and armature windings
C the connection of the brush and commutator
D the connection of the motor batteries

# Q16: What are the effects of moving a closed wire loop through a magnetic field?

A A voltage is induced in the wire.
B A current is induced in the wire.
C The polarity across the wire depends on the direction of motion.
D All of the above

A
13.33 mAt
B
300 At
C
75 At
D
152 At

# Q18: A Hall effect sensor

A exists only in theory
B is a noncontacting magnetic sensor
C can operate only a few times before failure
D produces very large voltages

A A speaker
B A dc generator
C A relay
D A solenoid

A Hysteresis
B Induction
C Retentivity
D Reluctance

# Q21: How much flux is there in a magnetic field when its flux density is 5000 T and its cross-sectional area is 300 mm2?

A
16.67 mWb
B
5.0 Wb
C
3.0 mWb
D
1.5 Wb

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