PDH Quiz - DC Generators, Armature, Commuters and DC Motors

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1.	_______________ completes the magnetic circuit between the poles and acts as a mechanical support for the other parts of the generator.
		Field frame
		Yoke
		Both A&B
2.	A practical DC generator uses electromagnets instead of permanent magnets.
		True
		False
3.	The following picture represents _____________.?
		Ring type
		Spiral type
		Drum type
4.	Which of the following figure shows where Armature is excited and field is unexcited?
		A
		B
		C
5.	_____________ are caused by the armature revolving in an alternating magnetic field.
		Hysteresis losses
		Eddy current losses
		Copper losses
6.	The armature resistance of a small, 28-volt DC motor is extremely low, about 0.1 ohm. When the armature is connected across the 28-volt source, current through the armature will apparently be__________.?
		2.8 amperes
		28 amperes
		280 amperes
		2800 amperes
7.	In the _________________, the field windings, consisting of a relatively few turns of heavy wire, are connected in series with the armature winding.
		Series motor
		Shunt motor
		Compound motor
		Ac motor
8.	The tendency of a force to produce rotation is called torque. The amount of torque developed in a coil depends upon which of the following factors?
		Strength of the magnetic field
		Number of turns in the coil
		Position of the coil in the field
		All the above
9.	The armature in a practical motor is placed between the poles of a permanent magnet but between those of an electromagnet, since a much stronger magnetic field can be furnished.
		True
		False
10.	The purpose of the pigtail is to conduct the current, rather than subjecting the brush spring to currents that would alter its spring action by overheating.
		True
		False

DC Generators, Armature, Commuters and DC Motors

Quiz Questions

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