motors II Word Scramble

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Question	Answer
A ? motor is a DC motor that has the field wiring connected in parallel with the armature.	shunt
The interpoles are connected in series with the ? windings.	armature
? motors are used in moderate starting conditions and where constant or adjustable speed is required.	Shunt
DC shunt motors can develop about ? to ? of full-load torque upon starting.	250% / 300%
With a(n) ? shunt field, the speed can be regulated by varying the field current, the armature current, or both	self-excited
A ? winding is a small series field winding that improves stability of the fields while running with reduced current in the field circuit.	stabilizing field
true/false DC compound motors have shared characteristics of series motors and shunt motors.	true
DC ? motors are used mostly for special applications that require constant speed under load and high starting torque.	compound
what are examples of a common DC compound motor	DC cumulative-compounded motor and DC differential-compounded motor
true/false DC permanent-magnet motors use magnets and coils of wire for the field windings.	false not coils of wire
Negative voltage regulation occurs only with ? generators.	series
A DC ? -wound generator provides a source of positive and zero voltage regulation to the load.	shunt
A DC ? operates on the principle that voltage is induced in a coil of wire when the coil is rotated in a magnetic field.	generator
? voltage regulation occurs when the countervoltage at no load is greater than the terminal voltage at full load.	Positive
When connected to 240 volts, a DC motor that has a winding resistance of 3.2 ohms at standstill draws ? .	75A
The field windings in a ? -wound generator consist of a few turns of low-resistance wire because the large load current flows through them.	series
An external ? applies mechanical torque to the armature and series field circuit, which induces voltage and current in the generator.	prime mover
True/false In a compound-wound generator, the series field is normally stronger than the shunt field.	false the shunt filed is normally the stronger of the two
When a DC motor connected to 235 volts accelerates to a speed that generates a countervoltage of 115 volts, the total voltage in the motor is ? .	120 volts
A motor connected to 280 volts has a resistance of 7 ohms. When the motor accelerates to full speed, the counter voltage is 245 volts; the total voltage in the motor is 35 volts and the current drawn is ? .	5.0 A
true/false Connecting voltage directly to the field and armature windings of a DC motor allows the motor to produce higher torque in a smaller frame than with an AC motor.	true
Interpoles reduce sparking at the ? of some DC motors.	brushes
A(n) ? connects a brush to either the positive or negative terminal of the DC source.	pigtails
The function of a(n) ? is to keep armature windings in the correct polarity to interact with the main fields of a motor.	commutator
The ? rule gives the direction of motion for current-carrying wire interacting with a stationary magnetic field.	right-hand motor
The neutral plane is ? to the field flux when there is no current in the armature.	perpendicular
Torque is exerted on the ? when the plane of the armature loop is parallel to the field and the armature loop sides are at right angles to the magnetic field.	armature
true/false The fields in a DC motor often change in polarity.	false
When the power is removed, DC ? motors provide some self-braking and produce relatively high torque at low speeds.	permanent-magnet

Created by: Yusosweet1