Tech-Chek 6

Question 0

The strength of an electromagnet can be increased by __________.

Answer 0

Increasing the voltage, increasing the turns of the wire, and iron core.

Question 1

A burned out solenoid is normally evident by __________.

Answer 1

Pungent odor

Question 2

A(n) _______ is the number of locations within the valve in which the spool is placed to direct fluid through the valve.

Answer 2

Position

Question 3

A small air gap is left in the iron core armature circuit to ________.

Answer 3

Prevent the armature from staying in a sealed position

Question 4

Voltage should b at least _____% of a solenoid’s rated voltage.

Answer 4

+-10

Question 5

Without the ______, excessive noise, wear, and heat build up on the armature faces.

Answer 5

Shading coil

Question 6

______ magnets are magnets that can retain their magnetism after the magnetizing force has been removed.

Answer 6

Permanent

Question 7

_______ magnets are magnets that have extreme difficulty in retaining their magnetism after the magnetizing force has been removed.

Answer 7

Temporary

Question 8

A burned out solenoid is normally evident by _____.

Answer 8

Pungent odor

Question 9

A DC generator always has a(n) ______ armature and ______field windings.

Answer 9

Rotating, stationary

Question 10

The ______ is the relationship between the current in a conductor and the magnetic field existing around the conductor.

Answer 10

Left hand

Question 11

The output voltage of a shunt-wound generator may be controlled by means of a(n) _______ connected in series with the shunt field.

Answer 11

Rheostat

Question 12

The ______ theory of magnetism states that all substances are made up of an infinite number of molecular magnets.

Answer 12

Molecular

Question 13

A(n) _____ is a magnetic laminate assembly consisting of a coil of wire and a source of voltage.

Answer 13

Solenoid

Question 14

The _______ is used to determine the direction of motion of a current-carrying conductor on a magnetic field.

Answer 14

Electron flow rule

Question 15

_________ is unwanted current induced in the metal structure of a device.

Answer 15

Eddy current

Question 16

A(n) ______ is a single turn of conducting material mounted on the face of the magnetic laminate assembly or armature.

Answer 16

Shading coil

Question 17

The mechanical life of most coils is improved by encapsulating them in _______ or glass-reinforced alkyd material.

Answer 17

Epoxy resin

Question 18

______ voltage is the minimum control voltage which causes the armature to start to move.

Answer 18

Pick up

Question 19

______ voltage is the voltage which exists when the voltage has reduced sufficiently to allow the solenoid to open.

Answer 19

Drop out

Question 20

Manufacturers provide letters or _____ codes to indicate the voltages available for a given solenoid.

Answer 20

Number(s)

Question 21

_______ two-way valves are common in refrigeration equipment.

Answer 21

Direct acting

Question 22

DC series motors can develop _____ of full load torque upon starting.

Answer 22

500%

Question 23

A solenoid _____ when the voltage is excessive.

Answer 23

Over heats

Question 24

______ voltages may damage the insulation on the solenoid coil.

Answer 24

Excessive

Question 25

No movement of the needle on an analog meter or infinite resistance on a(n) ______ meter indicates the coil is open and defective.

Answer 25

Digital meter

Question 26

______ valves are used as shutoff, check, or quick-exhaust valves.

Answer 26

Two-way

Question 27

A(n) ______motors use magnets rather than a coil of wire for the field windings.

Answer 27

DC permanent

Question 28

A(n) ______ circuit is a circuit in which current leaves its normal path and travels to the frame of the motor.

Answer 28

Grounding

Question 29

A(n) ______ motor has the advantage of high torque and constant speed.

Answer 29

DC compound

Question 30

A(n) ______ connects a brush to the external circuit of a DC motor.

Answer 30

Pig tail