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WorksheetsQuiz DC generator.c EEE430
Total questions: 10
Worksheet time: 5mins
In the DC generator experiment, the motor used to drive the generator is:
Series motor
Shunt motor
DC Machine MV1028 or MV1034
Power Pack MV1300
Which type of generator connection uses both series and shunt field windings?
Shunt generator
Compound generator
Series generator
Separately excited generator
What is the main role of the Power Pack MV1300 in the experiment?
To measure torque
To provide DC supply for field excitation and load circuits
To vary load current
To control motor speed
What happens to the induced voltage E if field current Im increases in a separately excited generator?
E increases
E decreases
E remains constant
E fluctuates randomly
Which factor mainly causes voltage drop in a loaded DC generator?
Commutator reaction
Armature resistance and load current
Brush friction
Air-gap length
The relationship between terminal voltage (V), induced EMF (E), and armature current (IB) is:
V=E+IBRA
V=E−IBRA
V=E×IB
V=E/IB
What will happen if the excitation current in a separately excited DC generator is reduced?
Output voltage decreases
Torque increases
Load current increases
Field flux remains unchanged
What precaution should be taken before switching on the Power Pack MV1300?
Set the load to maximum
Ensure the variable DC control is at zero
Set excitation current to 1A
Switch on from right to left
What is the typical effect of magnetic saturation on the E vs Im curve?
Curve becomes linear
Curve flattens at higher Im values
Voltage becomes unstable
Voltage decreases
Why should the same speed be maintained throughout the experiment?
To ensure fair comparison of voltage readings
To protect the field winding
To stabilise field resistance
To maintain constant torque
