m2 - chap 3 Flashcards
In what decade was the first transistor created?
A) 1930s
B) 1940s
C) 1950s
D) 1960s
B) 1940s
How many layers of material does a transistor have?
A) 1
B) 2
C) 3
D) 4
C) 3
What is the ratio of the total width to that of the center layer for a transistor?
A) 1:15
B) 1:150
C) 15:1
D) 150:1
D) 150:1
Which of the following is (are) the terminal(s) of a transistor?
A) Emitter
B) Base
C) Collector
D) All of the above
D) All of the above
List the types of bipolar junction transistors.
A) ppn, npn
B) pnp, npn
C) npp. ppn
D) nnp. pnp
B) pnp, npn
Transistors are _____-terminal devices.
A) 2
B) 3
C) 4
D) 5
B) 3
How many carriers participate in the injection process of a unipolar device?
A) 1
B) 2
C) 0
D) 3
A) 1
Which component of the collector current lc is called the leakage current?
A) Majority
B) Independent
C) Minority
D) None of the above
C) Minority
For a properly biased pnp transistor, let lc = 10 mA and IE = 10.2 mA. What is the level of Ig?
A) 0.2 A
B) 200 mA
C) 200 μA
D) 20.2 mA
C) 200 μA
Calculate minority current Ico if IC = 20.002 mA and Ic majority = 20 mA.
A) 2 µA
B) 0.002 µA
C) 2 nA
D) 2 PA
A) 2 µA
Which of the following regions is (are) part of the output characteristics of a transistor?
A) Active
B) Cutoff
C) Saturation
D) All of the above
D) All of the above
In which region are both the collector-base and base-emitter junctions forward-biased?
A) Active
B) Cutoff
C) Saturation
D) All of the above
C) Saturation
How much is the base-to-emitter voltage of a transistor in the “on” state?
A) 0 V
B) 0.7 V
C) 0.7 mV
D) Undefined
B) 0.7 V
In the active region, while the collector-base junction is ______-biased, the base-emitter is ______-biased.
A) forward, forward
B) forward, reverse
C) reverse, forward
D) reverse, reverse
C) reverse, forward
What is ẞdc equal to?
A) IB / IE
B) IC / IE
C) IC / IB
D) None of the above
C) IC / IB
What are the ranges of the ac input and output resistance for a common-base configuration?
Α) 10 Ω-100 Ω, 50 ΚΩ-1 ΜΩ
Β) 50 ΚΩ-1 ΜΩ, 10 Ω-100 Ω
C) 10 Ω-100 ΚΩ, 50 Ω-1 ΚΩ
D) None of the above
Α) 10 Ω - 100 Ω, 50 ΚΩ -1 ΜΩ
For what kind of amplifications can the active region of the common-emitter configuration be used?
A) Voltage
B) Current
C) Power
D) All of the above
D) All of the above
Use this table of collector characteristics to calculate Bac at VCE = 15 V and IB = 30 µA.
A) 100
B) 106
C) 50
D) 400
A) 100
Calculate ẞdc at VCE = 15 V and IB = 30 μA.
A) 100
B) 116
C) 50
D) 110
D) 110
Which of the following configurations can a transistor set up?
A) Common-base
B) Common-emitter
C) Common-collector
D) All of the above
D) All of the above
Determine the value of a when ẞ = 100.
A) 1.01
B) 101
C) 0.99
D) Cannot be solved with the information provided
C) 0.99
What is the most frequently encountered transistor configuration?
A) Common-base
B) Common-collector
C) Common-emitter
D) Emitter-collector
C) Common-emitter
Bdc for this set of collector characteristics is within
A) 2
B) 5
C) 7
D) 10
D) 10
Bdc =
A) IB / IE
B) IC / IE
C) IC / IB
D) None of the above
C) IC / IB
What is (are) the component(s) of most specification sheets provided by the manufacturer?
A) Maximum ratings
B) Thermal characteristics
C) Electrical characteristics
D) All of the above
D) All of the above
What is (are) the component(s) of electrical characteristics on the specification sheets? TABLE)
A) On
B) Off
C) Small-signal characteristics
D) All of the above
D) All of the above
Most specification sheets are broken down into
A) maximum ratings
B) thermal characteristics
C) electrical characteristics
D) All of the above
D) All of the above
An example of a pnp silicon transistor is a 2N4123.
A) True
B) False
B) False
Which of the following equipment can check the condition of a transistor?
A) Current tracer
B) Digital display meter (DDM)
C) Ohmmeter (VOM)
D) All of the above
D) All of the above
Which of the following can be obtained from the last scale factor of a curve tracer?
A) hFE
B) adc
C) aac
D) Bac
D) Bac
Calculate Bac for IC = 15 mA and VCE = 5 V.
A) 200
B) 180
C) 220
D) None of the above
A) 200
What range of resistor values would you get when checking a transistor for forward- and reverse- biased conditions by an ohmmeter?
A) 100 to a few kΩ, exceeding 100 kΩ
B) Exceeding 100 kΩ, 100 Ω to a few kΩ
C) Exceeding 100 kΩ, exceeding 100 kΩ
D) 100 Ω to a few ΚΩ, 100 Ω to a few ΚΩ
A) 100 to a few kΩ, exceeding 100 kΩ
What does a reading of a large or small resistance in forward- and reverse-biased conditions indicate when checking a transistor using an ohmmeter?
A) Faulty device
B) Good device
C) Bad ohmmeter
D) None of the above
A) Faulty device
A transistor can be checked using a(n)
A) curve tracer
B) digital meter
C) ohmmeter
D) Any of the above
D) Any of the above
How many individual pnp silicon transistors can be housed in a 14-pin plastic dual-in-line package?
A) 4
B) 7
C) 10
D) 14
A) 4
All amplifiers should have at least _____ terminals with _____ terminal(s) controlling the flow between other ______ terminal(s).
A) 2, 1, 1
B) 3, 1, 2
C) 3, 2, 1
D) 3, 0, 3
B) 3, 1, 2
The outer layers of a transistor are _________ the sandwiched layer.
A) much smaller than
B) the same as
C) much larger than
D) None of the above
C) much larger than
The doping of the sandwiched layer is _______ that of the outer layers.
A) considerably less than
B) the same as
C) considerably more than
D) None of the above
A) considerably less than
The lower doping level _______ the conductivity and ______ the resistivity of the material.
A) increases, decreases
B) increases, increases
C) decreases, decreases
D) decreases, increases
D) decreases, increases
The term bipolar reflects the fact that _____ and ____ participate in the injection process into the oppositely polarized material.
A) holes, neutrons
B) holes, electrons
C) neutrons, electrons
D) None of the above
B) holes, electrons
One p-n junction of a transistor is ____-biased and the other one is _____-biased in the active region.
A) reverse, reverse
B) forward, forward
C) reverse, forward
D) None of the above
C) reverse, forward
The magnitude of the base current is typically on the order of as compared to for the emitter.
A) µA, µA
B) µA, mA
C) mA, µA
D) mA, mA
B) µA, mA
The base current is the _____ of the emitter and collector currents.
A) sum
B) difference
C) product
D) None of the above
B) difference
The ________ region is the region normally employed for linear (undistorted) amplifiers.
A) active
B) cutoff
C) saturation
D) All of the above
A) active
In the cutoff region the collector-base junction is _______-biased and the base-emitter junction is _______-biased for a transistor.
A) reverse, forward
B) forward, reverse
C) reverse, reverse
D) forward, forward
C) reverse, reverse
In the saturation region the collector-base junction is _____-biased and the base-emitter junction is _______-biased for a transistor.
A) reverse, forward
B) forward, reverse
C) reverse, reverse
D) forward, forward
D) forward, forward
For practical transistors the level of alpha typically extends from _____ to _____ with most approaching the higher end of the range.
A) 0.0, 1
B) 0.90, 0.998
C) 50, 400
D) None of the above
B) 0.90, 0.998
Typical values of voltage amplification for the common-base configurations vary from _______ and the current gain is always _______
A) less than 1, 50 to 300
B) 50 to 300, larger than 1
C) 50 to 300, less than 1
D) larger than 1, 50 to 300
C) 50 to 300, less than 1
If a value of beta.gif is specified for a particular transistor configuration it will normally be used for ________ calculations.
A) ac
B) dc
C) ac and dc
D) None of the above
C) ac and dc
The common-collector configuration has a ____ input impedance and a ______ output impedance.
A) Low, high
B) high, low
C) high, high
D) low, low
B) high, low
The active region of a transistor is bounded by the
A) cutoff region
B) saturation region
C) power dissipation curve
D) All of the above
D) All of the above
The “on” and “off” characteristics refer to _____ limits while the small-signal characteristics indicate the parameters of importance to ________ operation.
A) ac, dc
B) dc, ac
C) ac, dc and ac
D) dc and ac, dc
B) dc, ac
The step function (per step) of a curve tracer reveals the scale for
A) collector current IC
B) VCE voltage
C) base current IB
D) All of the above
C) base current IB
The level of _____ is determined and displayed by advanced digital meters.
A) VCE
B) IB
C) IC
D) Bdc
D) Bdc
The level of _____ is determined and displayed by advanced digital meters if using diode-testing mode.
A) VBE
B) IC
C) IB
D) IE
A) VBE
When checking a transistor by ohmmeter, a relatively _______ resistance is displayed for a forward-biased junction and _______ resistance for a reverse-biased junction.
A) Low, very high
B) low, low
C) high, high
D) high, very low
A) Low, very high
An OL indication on an advanced digital meter indicates _______ while checking a transistor.
A) forward bias
B) reverse bias
C) definitely a defective transistor
D) None of the above
B) reverse bias
If the positive lead of an ohmmeter is connected to the base and the negative lead to the emitter, a low resistance reading would indicate a ______ transistor and a high resistance reading would indicate a _______ transistor.
A) npn, pnp
B) pnp, npn
C) npn, npn
D) pnp, pnp
A) npn, pnp
The leads of a transistor are typically made of
A) gold
B) aluminum
C) nickel
D) All of the above
B) aluminum
There is(are) _______ in the internal construction of a TO-92 package.
A) gold bond wires
B) a copper frame
C) epoxy encapsulation
D) All of the above
D) All of the above
