Tech-Chek 6 Flashcards
The strength of an electromagnet can be increased by __________.
Increasing the voltage, increasing the turns of the wire, and iron core.
A burned out solenoid is normally evident by __________.
Pungent odor
A(n) _______ is the number of locations within the valve in which the spool is placed to direct fluid through the valve.
Position
A small air gap is left in the iron core armature circuit to ________.
Prevent the armature from staying in a sealed position
Voltage should b at least _____% of a solenoid’s rated voltage.
+-10
Without the ______, excessive noise, wear, and heat build up on the armature faces.
Shading coil
______ magnets are magnets that can retain their magnetism after the magnetizing force has been removed.
Permanent
_______ magnets are magnets that have extreme difficulty in retaining their magnetism after the magnetizing force has been removed.
Temporary
A burned out solenoid is normally evident by _____.
Pungent odor
A DC generator always has a(n) ______ armature and ______field windings.
Rotating, stationary
The ______ is the relationship between the current in a conductor and the magnetic field existing around the conductor.
Left hand
The output voltage of a shunt-wound generator may be controlled by means of a(n) _______ connected in series with the shunt field.
Rheostat
The ______ theory of magnetism states that all substances are made up of an infinite number of molecular magnets.
Molecular
A(n) _____ is a magnetic laminate assembly consisting of a coil of wire and a source of voltage.
Solenoid
The _______ is used to determine the direction of motion of a current-carrying conductor on a magnetic field.
Electron flow rule
_________ is unwanted current induced in the metal structure of a device.
Eddy current
A(n) ______ is a single turn of conducting material mounted on the face of the magnetic laminate assembly or armature.
Shading coil
The mechanical life of most coils is improved by encapsulating them in _______ or glass-reinforced alkyd material.
Epoxy resin
______ voltage is the minimum control voltage which causes the armature to start to move.
Pick up
______ voltage is the voltage which exists when the voltage has reduced sufficiently to allow the solenoid to open.
Drop out
Manufacturers provide letters or _____ codes to indicate the voltages available for a given solenoid.
Number(s)
_______ two-way valves are common in refrigeration equipment.
Direct acting
DC series motors can develop _____ of full load torque upon starting.
500%
A solenoid _____ when the voltage is excessive.
Over heats
______ voltages may damage the insulation on the solenoid coil.
Excessive
No movement of the needle on an analog meter or infinite resistance on a(n) ______ meter indicates the coil is open and defective.
Digital meter
______ valves are used as shutoff, check, or quick-exhaust valves.
Two-way
A(n) ______motors use magnets rather than a coil of wire for the field windings.
DC permanent
A(n) ______ circuit is a circuit in which current leaves its normal path and travels to the frame of the motor.
Grounding
A(n) ______ motor has the advantage of high torque and constant speed.
DC compound
A(n) ______ connects a brush to the external circuit of a DC motor.
Pig tail
