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Testing Electric Appliances 93021

Customer Question

i need penn foster exams
Testing Electric Appliances 93021   
Solenoids, Relays, And Motors. 93031  
Electric Heating Appliances And Fans 93041    
Cooking Appliances 93051  
Motor-driven Small Appliances 93061
thank you
Submitted: 2 years ago.
Category: Homework
Expert:  akch2002 replied 2 years ago.
Kindly upload the questions. I may reply.
Customer: replied 2 years ago.
here's the first one
1.   If the current through a heater coil is 5 amp and the supply voltage is 120 volts, the coil resistance is
A. 0.04 ohm.
B. 24 ohms.
C. 110 ohms.
D. 575 ohms.
 
2.   The amount of current flowing in a circuit can be measured by
A. an ammeter.
B. a voltmeter.
C. a neon test lamp.
D. an ohmmeter.
 
3.   Which one of the following letters is used in formulas as the symbol for voltage?
A. P
B. W
C. I
D. E
 
4.   The conductors in electrical devices are commonly made of
A. iron.
B. nickel.
C. copper.
D. lead.
 
5.   The energy used by an appliance which operates at 240 volts at 15 amp for 4 hr. is
A. 0.92 kwhr.
B. 3.45 kwhr.
C. 14.4 kwhr.
D. 60.0 kwhr.
 
6.   What is the voltage in a circuit with a resistance of 12 ohms and a current of 20 amp?
A. 0.58 volt
B. 1.74 volts
C. 120 volts
D. 240 volts
 
7.   If an appliance does NOT work at all when you plug it in and turn the switch on, the appliance circuit is
A. shorted.
B. overloaded.
C. leaking.
D. open.
 
8.   To read the line voltage supplied to an appliance, you should connect the voltmeter
A. in series with the power supply.
B. between the grounded wire and the water pipe.
C. across the power supply.
D. between terminals of two adjacent circuit parts.
 
9.   The best method for testing the continuity of each part of an appliance uses
A. a voltmeter.
B. an ammeter.
C. an ohmmeter.
D. a wattmeter.
 
10.   A 2000-watt heater connected to a 120-volt circuit will draw a current of
A. 5.75 amp.
B. 15 amp.
C. 16.67 amp.
D. 23 amp.
 
11.   What type of fault causes an appliance to blow a fuse when the appliance is turned on?
A. An open circuit
B. Too much resistance
C. A short circuit
D. Too high a voltage
 
12.   Which one of the following conditions is unfavorable for the use of an ohmmeter?
A. Voltage is supplied to the appliance
B. The appliance is grounded
C. Moisture is in the insulation
D. The appliance circuit is shorted
 
13.   A series circuit in an appliance consists of
A. several branches carrying independent currents.
B. more than one part connected across the same terminals.
C. several parts connected end to end.
D. more than one path carrying the current.
 
14.   Which one of the following components is used to change an AC voltage to a lower or higher value?
A. Transistor
B. Transformer
C. Capacitor
D. Resistor
 
15.   A full-wave bridge rectifier uses how many diodes?
A. One
B. Two
C. Three
D. Four
 
16.   An NPN transistor is correctly biased and turned on if the
A. base is negative.
B. collector is negative.
C. collector is positive with respect to the emitter and negative with respect to the base.
D. collector is the most positive lead followed by the base.
 
17.   When an SCR turns ON, it acts like a(n)
A. transistor.
B. resistor and capacitor in series.
C. electronic switch and rectifier.
D. bridge rectifier.
 
18.   Which one of the following IC digital gates requires a high on both inputs to output a high?
A. AND
B. OR
C. NAND
D. NOR
 
19.   Which one of the following IC gates will have a low output if either of the inputs are high?
A. Buffer
B. NAND
C. NOR
D. OR
 
20.   A microprocessor runs an internal program called a(n)
A. operating system.
B. scratchpad memory.
C. instruction chain.
D. PAL.
 
21.   A resistor with the color bands brown, red, red and silver will have a resistance of
A. 120 ohms.
B. 1,200 ohms.
C. 2,100 ohms.
D. 6,400 ohms.
 
22.   What type of diagram chart in a service manual can be used to easily service an electronic circuit board with ICs?
A. Exploded
B. Flowchart
C. Assembly
D. Pictorial
 
23.   An LED display device uses how many segments to create the number 8?
A. Three
B. Four
C. Seven
D. Eight
 
24.   When testing transistors, how much minimum voltage difference should be seen across the base-emitter junction?
A. 0.1 VDC
B. 0.4 VDC
C. 0.6 VDC
D. 0.9 VDC
 
25.   When you are forward-bias testing a diode with a digital VOM, the red test lead should be placed on which lead of the diode?
A. Anode
B. Cathode
C. Emitter
D. Drain
Expert:  akch2002 replied 2 years ago.
Thanks. I will try to reply today.
Expert:  akch2002 replied 2 years ago.
Here are answers marked in yellow color below each question in the following link.
word file
Kindly ACCEPT the answers. BONUS and POSITIVE feedback will be appreciated.
Customer: replied 2 years ago.
I can't see the yellow can you put these around the answers ( )? and I have 4 more exams
Expert:  akch2002 replied 2 years ago.

Answers marked in bold below each question.

1. If the current through a heater coil is 5 amp and the supply voltage is 120 volts, the coil resistance is
A. 0.04 ohm.
B. 24 ohms.
C. 110 ohms.
D. 575 ohms.

2. The amount of current flowing in a circuit can be measured by
A. an ammeter.
B. a voltmeter.
C. a neon test lamp.
D. an ohmmeter.

3. Which one of the following letters is used in formulas as the symbol for voltage?
A. P
B. W
C. I
D. E

4. The conductors in electrical devices are commonly made of
A. iron.
B. nickel.
C. copper.
D. lead.

5. The energy used by an appliance which operates at 240 volts at 15 amp for 4 hr. is
A. 0.92 kwhr.
B. 3.45 kwhr.
C. 14.4 kwhr.
D. 60.0 kwhr.

6. What is the voltage in a circuit with a resistance of 12 ohms and a current of 20 amp?
A. 0.58 volt
B. 1.74 volts
C. 120 volts
D. 240 volts

7. If an appliance does NOT work at all when you plug it in and turn the switch on, the appliance circuit is
A. shorted.
B. overloaded.
C. leaking.
D. open.

8. To read the line voltage supplied to an appliance, you should connect the voltmeter
A. in series with the power supply.
B. between the grounded wire and the water pipe.
C. across the power supply.
D. between terminals of two adjacent circuit parts.

9. The best method for testing the continuity of each part of an appliance uses
A. a voltmeter.
B. an ammeter.
C. an ohmmeter.
D. a wattmeter.

10. A 2000-watt heater connected to a 120-volt circuit will draw a current of
A. 5.75 amp.
B. 15 amp.
C. 16.67 amp.
D. 23 amp.

11. What type of fault causes an appliance to blow a fuse when the appliance is turned on?
A. An open circuit
B. Too much resistance
C. A short circuit
D. Too high a voltage

12. Which one of the following conditions is unfavorable for the use of an ohmmeter?
A. Voltage is supplied to the appliance
B. The appliance is grounded
C. Moisture is in the insulation
D. The appliance circuit is shorted

13. A series circuit in an appliance consists of
A. several branches carrying independent currents.
B. more than one part connected across the same terminals.
C. several parts connected end to end.
D. more than one path carrying the current.

14. Which one of the following components is used to change an AC voltage to a lower or higher value?
A. Transistor
B. Transformer
C. Capacitor
D. Resistor

15. A full-wave bridge rectifier uses how many diodes?
A. One
B. Two
C. Three
D. Four

16. An NPN transistor is correctly biased and turned on if the
A. base is negative.
B. collector is negative.
C. collector is positive with respect to the emitter and negative with respect to the base.
D. collector is the most positive lead followed by the base.

17. When an SCR turns ON, it acts like a(n)
A. transistor.
B. resistor and capacitor in series.
C. electronic switch and rectifier.
D. bridge rectifier.

18. Which one of the following IC digital gates requires a high on both inputs to output a high?
A. AND
B. OR
C. NAND
D. NOR

19. Which one of the following IC gates will have a low output if either of the inputs are high?
A. Buffer
B. NAND
C. NOR
D. OR

20. A microprocessor runs an internal program called a(n)
A. operating system.
B. scratchpad memory.
C. instruction chain.
D. PAL.

21. A resistor with the color bands brown, red, red and silver will have a resistance of
A. 120 ohms.
B. 1,200 ohms.
C. 2,100 ohms.
D. 6,400 ohms.

22. What type of diagram chart in a service manual can be used to easily service an electronic circuit board with ICs?
A. Exploded
B. Flowchart
C. Assembly
D. Pictorial

23. An LED display device uses how many segments to create the number 8?
A. Three
B. Four
C. Seven
D. Eight

24. When testing transistors, how much minimum voltage difference should be seen across the base-emitter junction?
A. 0.1 VDC
B. 0.4 VDC
C. 0.6 VDC
D. 0.9 VDC

25. When you are forward-bias testing a diode with a digital VOM, the red test lead should be placed on which lead of the diode?
A. Anode
B. Cathode
C. Emitter
D. Drain

akch2002, Engineer
Category: Homework
Satisfied Customers: 2871
Experience: Home work expert
akch2002 and 4 other Homework Specialists are ready to help you
Customer: replied 2 years ago.
heres the next one
93031
1.   An electromagnet becomes stronger when the
A. current through the magnetizing coil is increased.
B. core of the magnet is removed.
C. size of wire in the coil is increased.
D. number of turns in the coil is reduced.
 
2.   The purpose of the shading coil in some appliance motors is to
A. increase the current flow through the rotor.
B. cause imbalance in the magnetic field.
C. place more weight on one pole.
D. strengthen the iron form of the motor.
 
3.   The rotor in a shaded-pole motor consists of
A. coils energized by alternating current.
B. a short-circuited loop of copper wire.
C. a permanent magnet.
D. an iron cylinder.
 
4.   Why does a shaded-pole motor run at a constant speed?
A. The lines of force do not change direction.
B. The current through the rotor circuit is constant.
C. The inertia of the load is at a minimum.
D. The frequency of the applied voltage is constant.
 
5.   What will happen if you place too many washers on the end of a shaded-pole motor shaft?
A. The motor will become noisy.
B. The rotor will jam.
C. The bearings will become too heavy.
D. The shaft will loosen.
 
6.   A shaded-pole motor coil will have a resistance of approximately
A. 2 to 4 ohms.
B. 5 to 10 ohms.
C. 15 to 40 ohms.
D. 100 to 200 ohms.
 
7.   The device which disconnects the start winding in some split-phase motor circuits after a preset speed is obtained is the
A. thermostat.
B. commutator.
C. brush spring.
D. relay.
 
8.   It is essential for a relay energized by alternating current to have
A. many turns of small wire.
B. a laminated core and a shading coil.
C. high resistance and light weight.
D. double-pole double-throw contacts.
 
9.   Which one of the following statements is true of a split-phase motor when it is starting?
A. The speed is high.
B. The torque is high.
C. The current is low.
D. The voltage is low.
 
10.   An important difference between a universal and a split-phase motor is that the split-phase motor has
A. two brushes attached to the stator.
B. a single coil formed on the rotor.
C. two windings on the stator.
D. an armature with a commutator.
 
11.   The function of a start winding in a split-phase motor is to
A. provide the starting torque.
B. reduce the starting current.
C. decrease the strength of the magnetic field.
D. improve the steady running at full speed.
 
12.   Which one of the following parts of a universal motor does not move?
A. The armature
B. The field coil
C. The shaft
D. The commutator
 
13.   A universal motor uses brushes made of
A. steel.
B. brass.
C. copper.
D. carbon.
 
14.   Why should you not use emery cloth for polishing the commutator of an appliance motor?
A. It wears the surface too much.
B. Its dust conducts electricity.
C. It fails to remove oily, discolored spots.
D. Its material reacts chemically with copper.
 
15.   The commutator of a universal motor connects each armature coil to
A. the rotor.
B. the shaft.
C. the gearbox.
D. a brush.
 
16.   The part you should check first when you are servicing a sparking universal motor is the
A. commutator.
B. armature.
C. brushes.
D. field windings.
 
17.   The range of motion for most pull-type solenoids is approximately
A. 50 mm. (2 in.)
B. 2.5 cm. (1 in.)
C. 3.0 cm. (1.25 in.)
D. 3.5 cm. (1.5 in.)
 
18.   In a solenoid valve system, if the voltage on the coil is 118 VAC and a continuity test of the solenoid's coil measures 80 ohms, yet the solenoid will not allow water flow, the most likely cause of failure is a
A. broken spring.
B. stuck plunger.
C. faulty coil.
D. cracked disk.
 
19.   If, when a relay is energized, you measure 0.05 VAC across a set of normally open contacts, the
A. relay is operating properly.
B. contacts must be burnt.
C. contacts must be pitted.
D. coil is open.
 
20.   If a shaded-pole motor is chattering or buzzing while it is turning, the problem is most likely caused by
A. an open shading pole.
B. a faulty coil.
C. a shorted rotor winding.
D. a faulty or worn bearing.
 
21.   The centrifugal switch contacts on a split-phase motor will open when the motor reaches what percentage of full speed?
A. 20%
B. 50%
C. 70%
D. 90%
 
22.   What will be the normal rotating speed in RPM for a split-phase motor with six poles covered by each run winding?
A. 900
B. 1200
C. 2400
D. 3600
 
23.   The calculated speed of a four-pole split-phase motor is 1800 RPM. However, if you measure the shaft speed, you will find it to be 1725 RPM. What causes this loss of rotational speed?
A. Counter electromagnet force
B. Magnetic slip
C. Centrifugal mechanism loading
D. Power line frequency changes
 
24.   Which one of the following is NOT a method of universal motor speed control?
A. Tapped field windings with a switch selector.
B. Varying the voltage using semiconductor devices.
C. Dynamic braking of the motor's shaft.
D. Using an adjustable centrifugal switch in parallel with a resistor.
 
Expert:  akch2002 replied 2 years ago.
I will try to reply asap. If there is any dead line, kindly inform. Thanks.
Customer: replied 2 years ago.
there is no deadline I just have 3 more after this
Expert:  akch2002 replied 2 years ago.
Thanks for clarification.
Expert:  akch2002 replied 2 years ago.
THIS ANSWER IS LOCKED!

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Customer: replied 2 years ago.
here's the next one thanks


1.   In selecting the wire size for a line cord, you should remember that
A. No. 16 is larger than No. 12.
B. No. 14 carries more current than No. 18.
C. No. 8 is smaller than No. 10.
D. No. 4 carries less current than No. 6.
 
2.   Which one of the following appliance parts gets the hardest service?
A. Switch
B. Thermostat
C. Heating element
D. Line cord
 
3.   The color used for the hot side of house wiring is
A. green.
B. white.
C. gray.
D. black.
 
4.   An AWG No. 16 line cord with type HPN insulation has an ampacity of
A. 12 amp.
B. 13 amp.
C. 15 amp.
D. 17 amp.
 
5.   To heat a room quickly, some electric room heaters are provided with
A. a heavy metal case.
B. a motor-driven fan.
C. a push-button switch.
D. an automatic thermostat.
 
6.   If the current flowing through an electric heater increases from 6 to 12 amp while the voltage remains the same, the heat produced by the heater will be
A. reduced one-half.
B. unchanged.
C. two times the original heat.
D. four times the original heat.
 
7.   The wires used in a heating element are usually made of
A. copper.
B. steel.
C. aluminum.
D. Nichrome.
 
8.   Why does a thermostat blade bend when heated or cooled?
A. It is made of two different materials.
B. There is a difference in temperature between the blade ends.
C. Different currents are applied to each end.
D. Mechanical pressure is caused by the high resistance.
 
9.   When you are checking an electric heating appliance, the first test made should be for
A. excessive leakage.
B. the normal voltage supply.
C. an open circuit.
D. low resistance.
 
10.   Why should you NOT repair heating elements by soldering?
A. Solder does not conduct electric current.
B. Solder joints are mechanically too weak.
C. Solder melts at the operating temperature of the heater.
D. Soldered joints have too high a resistance.
 
11.   What type of selector switch can be used to control the heat output of three elements connected in parallel?
A. SPST switch
B. DPST switch
C. DPDT switch
D. Shorting-bar-type switch
 
12.   Thermostats used in electric irons differ from those in small room heaters in that they are
A. smaller in size.
B. operative at higher temperatures.
C. connected directly to the appliance plug.
D. mechanically more fragile.
 
13.   How can you clean out the scales in an electric iron without taking the iron apart?
A. By blowing out the holes with compressed air
B. By scraping the tank and tubes with a drill bit
C. By brushing the clogged tubes with a stiff wire brush
D. By rinsing the tank and holes with a water-diluted chemical
 
14.   Bus bars are used in an electric iron as
A. thermostat supports.
B. heat-adjusting resistors.
C. connectors between the thermostat and the element.
D. electrical terminals.
 
15.   The water in a spray iron is prevented from returning to the tank by the action of a
A. suction tube.
B. check valve.
C. water pump.
D. pressure spring.
 
16.   The heating element in an electric iron is in good working order if the resistance across the terminals of the element reads approximately
A. 0 ohms.
B. 15 ohms.
C. 120 ohms.
D. 1000 ohms.
 
17.   Why does the heat of the heating element stop when the desired temperature in an electric iron is reached?
A. The thermostat blade opens electrical contacts.
B. The circuit through the element is closed.
C. The switch bypasses the thermostat.
D. The contacts on the blade touch.
 
18.   Jumpering out the resistors in a resistance-controlled three-speed fan will cause the motor to
A. run at highest speed.
B. run at medium speed.
C. run at lowest speed.
D. stop immediately.
 
19.   A fan equipped with a gearbox is capable of
A. running at three speeds.
B. being tilted downward.
C. oscillating from side to side.
D. reversing the direction of the motor.
 
20.   If the fan blades rattle while the fan is turning, you can stop the noise by
A. oiling the blades.
B. adjusting the blade angles and the blade tip position.
C. tightening the motor end bells and motor mounts.
D. cleaning the blade surfaces.
 
21.   The recommended way to hold a loose hub on a fan is by
A. riveting.
B. soldering.
C. welding.
D. cementing.
 
22.   Quiet operation of a fan depends mostly upon the
A. weight of the blades.
B. material of the blades.
C. motor balance.
D. balance of the blades.
 
23.   The blades of small fans are made of
A. aluminum.
B. steel.
C. tin.
D. copper.
 
24.   A modern variable-speed fan does NOT use
A. a tapped inductor.
B. a multiple-winding motor.
C. an electronic speed control.
D. a dropping resistor.
 
25.   An attic fan, or power ventilator, may have its power inadvertently tapped from
A. an upstairs bathroom.
B. an attic lighting circuit.
C. a basement service.
D. an air conditioning circuit.
 

Expert:  akch2002 replied 2 years ago.
What about the answers submitted for 2nd set? Kindly give your response before I try to reply 3rd set.
Expert:  akch2002 replied 2 years ago.
THIS ANSWER IS LOCKED!

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