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CWBi Acorn Red Seal book 1 > review Questions - Electrical Principles > Flashcards

review Questions - Electrical Principles Flashcards

1
Q

What is another term for DCEP?

  1. straight polarity
  2. direct current electromotive potential
  3. reverse polarity
  4. alternating current positive
A

reverse polarity

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2
Q

to initiate an arc requires:
1. high current
2. high voltage
3. high inductance
4. high resistance

A

high voltage

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3
Q

how much current will flow through a resistance of 200 ohms when 100 volts is applied?
1. 0.5 amps
2. 5.0 amps
3. 2.0 amps
4. 20 amps

A

0.5 amps

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4
Q

A generator consists of rotating conductors in a stationary magnetic field and alternator consists of a rotating magnetic field inside the conductor wings.

  1. true
  2. false
A

true

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5
Q

when using SMAW, the welding cables represent a series circuit. where should voltage be measured?

  1. at the power source
  2. anywhere in the circuit
  3. from the electrode holder to the work lead
  4. through the contact tip
A

from the electrode holder to the work lead

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6
Q

What type of power supply is required for GTAW?

  1. constant voltage
  2. high frequency
  3. variable current
  4. constant current
A

constant current

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7
Q

One of the simplest ways of controlling the output of a welding transformer is to change the efficiency of coupling. How can this be done?

  1. slide a piece of wood between the primary and the secondary
  2. design the transformer with either a moving core or moving primary coils
  3. design the transformer with a number of taps to select different output curves
  4. use the timed firing of SCR’s to control total conduction time
A

design the transformer with either a moving core or moving primary coils

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8
Q

what is the term for voltage measured across the output terminals of a welding machine when no current is being drawn?

  1. diode voltage
  2. operating voltage
  3. open circuit voltage
  4. terminal voltage
A

open circuit voltage

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9
Q

Which metal has the lowest electrical resistivity?

  1. aluminum
  2. tungsten
  3. copper
  4. iron
A

copper

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10
Q

A transformer with more windings in the primary than the secondary is what kind of transformer?

  1. step up
  2. isolator
  3. step down
  4. inverter
A

step down

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11
Q

A transformer works on what type of current?

  1. DCEP
  2. DCEN
  3. AC
  4. DC
A

AC

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12
Q

What is the unit of measure for electomotive force?

  1. amp
  2. volt
  3. ohm
  4. flux
  5. hertz
A

volt

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13
Q

what is the unit of measure for frequency?

  1. amp
  2. volt
  3. ohm
  4. flux
  5. hertz
A

hertz

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14
Q

in the constant voltage output system, increasing tip to work distance increases the resistance in the power circuit. What is the effect on current flow?

  1. no effect on current
  2. increase the current
  3. decreases the current
  4. pulsing of current
A

decreases the current

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15
Q

how much current will flow through a resistance of 50 ohms when 25 volts is applied?

  1. 0.2 amps
  2. 0.5 amps
  3. 2 amps
  4. 5 amps
A

0.5 amps

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16
Q

Which type of power is best suited for manual welding?

  1. constant voltage
  2. alternating current
  3. high frequency start
  4. constant current
A

constant current

17
Q

An arc welding power source which has an unchanging potential (voltage) is called what?

  1. constant current
  2. alternating current
  3. direct current
  4. constant voltage
  5. variable voltage
A

constant voltage

18
Q

What is the open circuit voltage (OCV)?

  1. Voltage measured across the arc.
  2. voltage input frommain supply
  3. voltage drop through the cables
  4. voltage duty cycle rating
  5. votage potential without power flowing
A

votage potential without power flowing

19
Q

Resistance is measured in which of the following terms?

  1. hertz
  2. volts
  3. amps
  4. ohms
A

ohms

20
Q

A rectifier is a device that is used to?

  1. convert DC to AC
  2. convert AC to DC
  3. switch polarity from negative to positive
  4. to step down high voltage to low voltage
A

convert AC to DC

21
Q

batteries produce what type of current?

  1. DC
  2. AC
  3. AC orDC
  4. OCV
A

DC

22
Q

Arc Blow caused by magnetic forces in the current flow can be greatly reduced or eliminating by?

  1. peening between weldswith a hammer
  2. relocating the location of the work lead
  3. switching weld current to AC
  4. using higher amperages than normal to overcome magnetic field
A

switching weld current to AC

23
Q

Residential power in Canada is supplied at what value?

  1. 120v and 240v 3 phase
  2. 575v sisingle phase
  3. 460v 3 phase
  4. 120v to 240v single phase
A

120v to 240v single phase

24
Q

How long can a welding machine rated at 60% Duty Cycle operating continuously at its rated duty output?

  1. 6 minutes out of 10 minutes
  2. 36 minutes out of 60 minutes
  3. 60 minutes out of 100 minutes
  4. continuously for 60 minutes
A

6 minutes out of 10 minutes

25
Q
A

CWBi Acorn Red Seal book 1 (6 decks)

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