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4th Year Electrical - Electronics > Rectifiers and Battery Chargers Part A > Flashcards

Rectifiers and Battery Chargers Part A Flashcards

1
Q 
What does a typical DC meter measure?
A) Average
B) Instantaneous
C) RMS
D) Maximum
A

A) Average

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2
Q 
What does a typical AC meter measure?
A) Average
B) Instantaneous
C) RMS
D) Maximum
A

C) RMS

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3
Q

What type of meter performs a continuity check on a circuit?

A

Ohmmeter

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4
Q

Does a digital ohmmeter with a reading OL indicate a short circuit or an open circuit?

A

Open Circuit

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5
Q

What type of ammeter doesn’t require the wiring of the circuit to be opened up and connected to the meter to measure the current?

A

Clamp-On Ammeter

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6
Q

What two things does a oscilloscope graph display?

A

Voltage and Time

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7
Q

If two scope leads each have a reference lead, should both reference leads be connected to the circuit or should one reference lead be isolated from the circuit?

A

One isolated

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8
Q

An AC voltage sine wave takes 8 divisions to complete one cycle. What is the period of the waveform?

A

8 ms

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9
Q

How many electrons does a semiconductor have in its valence shell?

A

4

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10
Q

What are the two types of doped semiconductive material called?

A

P-Type

N-Type

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11
Q

When light shines on a LDR what happens to its resistance?

A) Increases
B) Decreases
C) Stays the same

A

B) Decreases

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12
Q

Conventional current is considered to flow through a diode from:

A) Anode to Cathode
B) Cathode to Anode

A

A) Anode to Cathode

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13
Q

What is the barrier voltage of a silicone PN junction?

A

0.7 V

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14
Q

When is a diode forward biased?

A) When it is more positive on the Anode
B) When it is more positive on the Cathode

A

A) When it is more positive on the Anode

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15
Q

What is Vrrm?

A

Repetitive reverse maximum voltage

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16
Q

What is I f(av)

A

Average current when forward biased

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17
Q

What is I fsm

A

Instantaneous maximum forward surge current

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18
Q

What application of a diode prevents the destructive effects of CEMF When an inductive DC circuit is opened up?

A) Light emitting
B) Rectifier
C) Blocking
D) Freewheeling

A

D) Freewheeling

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19
Q

What application of a diode is used in a fire bell?

A) Light emitting
B) Rectifier
C) Blocking
D) Freewheeling

A

C) Blocking

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20
Q

In a P-type material the minority current carriers are the electrons.

True or False?

A

True

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21
Q

What is the purpose of a free wheeling diode?

A) prevent arcing at switches in inductive dc circuits.

B) absorb the cemf spike when a dc circuit is opened.

C) supply current to dc inductors when the supply is switched off.

D) suppress inductive reactance in ac circuits.

A

A) prevent arcing at switches in inductive dc circuits.

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22
Q

Electrons in the outermost shell are known as ____________ electrons.

A

Valence

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23
Q

Conductors have a very ______ electrical resistance.

A

Low

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24
Q

Electrons only loosely bound to the atom are called ______ _________.

A

Free electrons

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25
Q

Insulators have a very ______ electrical resistance.

A

High

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26
Q

Semiconductors posses four valence electrons and are referred to as ______________ elements.

A

Tetravalent

27
Q

What are two common tetravalent elements found in semiconductors?

A

Silicon (Si)

Germanium (Ge)

28
Q

What is covalent bonding?

A

Each atom shares its four valence electrons with the adjoining atoms, causing the material to act as if each atom had eight electrons in the outer shell.

29
Q

Once intrinsic material has been doped, the result is __________ material.

A

Extrinsic

30
Q

_____________ materials contain five valence electrons.

A

Pentavalent.

N-Type

31
Q

_____________ materials contain three valence electrons.

A

Trivalent

P-Type

32
Q

The bond between silicon atoms are called a _________ bond, and together the atoms form a _________ __________ structure.

A

The bond between silicon atoms are called a COVALENT bond, and together the atoms form a CRYSTAL LATTICE structure.

33
Q

Silicon and germanium are __________ materials.

A

Tetravalent

34
Q

Silicon is doped with ____________ atoms to form N-Type material.

A

Pentavalent

35
Q

Silicon is doped with ____________ atoms to form P-Type material.

A

Trivalent

36
Q

For a half-wave single phase rectifier, the DC current through the diode is _______ _____ the load current.

A

Equal too

37
Q

Intrinsic silicon is doped with trivalent material the crystal lattice structure has a _________ charge.

A

Neutral

38
Q

A PN junction is reversed biased. This PN junction develops a large ___________ region.

A

Barrier region;

Depletion region

39
Q

For a diode to begin to conduct it must overcome the ________ ___________.

A

Barrier potential

40
Q

A photo-diode is placed ________-bias in the circuit.

A

Reverse

41
Q

A series ammeter has a ______ resistance.

A

Low

42
Q

A voltmeter has a ______ resistance.

A

High

43
Q

_______________ is the property of a material that exhibits a lower resistance when exposed to light energy.

A

Photoconduction

  • Devices made of this material are photoconductive cells (photocells).
44
Q

What is a MOV device?

A

Metal-Oxide-Varistor

  • Type of surge suppressor; filters out voltage spikes that can occur on the AC supply.
45
Q

____________ ___________ ____________ is instantaneous reverse bias voltage that can safely be applied to the diode.

A

Repetitive reverse maximum (Vrrm)

46
Q

Press fit diodes are also known as __________ current diodes.

A

Medium

47
Q

Diodes in the 150A to 500A range are usually ______ ________ with a pigtail

A

Stud mounted

48
Q

Low current diodes are rated ___A or less

A

3A

49
Q

Heat sinks are usually mounted vertically to make use of the ________ ________ in which air moves by convection over the fins.

A

Chimney effect

50
Q

The largest current rating diodes are available in a shape called a _________ ____.

A

Hockey puk

51
Q

The four most important electrical rating of diodes are:

A
  • Maximum forward bias average current; I f(max)
  • Repetitive reverse maximum; Vrrm
  • Maximum instantaneous forward surge current; Ifsm or Ifm surge
  • Forward voltage drop at rated current; Vf at rated If
52
Q

The nucleus contains what two subatomic particles?

A

Protons and neutrons

53
Q

What subatomic particle has a negative charge?

A

Electrons

54
Q

How many electrons does an insulator have?

A

5 to 8

55
Q

P-Type material has a net ________ charge.

A

Neutral

56
Q

N-Type material is doped with ________-valent atoms

A

Pentavalent

57
Q

When P-Type material is joined with N-Type material what device is created?

A

Diode (PN Junction)

58
Q

Name two semiconductors materials

A

Silicon (0.7V)

Germanium (0.3V)

59
Q

The term intrinsic means the material is _________.

A

Pure

60
Q

The term extrinsic means the material has been _________.

A

Doped

61
Q

Silicon is doped with trivalent atoms to form __-type material.

A

P-type

62
Q

When an impurity is added to an intrinsic material it becomes ________ material.

A

Extrinsic

63
Q

What is used to control the destructive effect of a Cemf spike caused by an inductive circuit?

A

Freewheeling diode

4th Year Electrical - Electronics (5 decks)

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