Title: Spec. Diodes and Transistor Basics
Course: Electronics Theory (IC 102-IC 102) > Section: Assessments

Q: The anode of a zener diode is the end that is marked in some way.
- True
- False
A: False

Q: Cutoff means that the emitter-base junction is properly biased.
- True
- False
A: False

Q: If I_e = I_b + I_c then, I_b = I_c + I_e
- True
- False
A: False

Q: When checking a NPN transistor with and ohmmeter, you find that when the black lead is on the collector and the red lead is on the base, you get a low reading and when you reverse the lead you get a high reading. this means that the BC junction is most likely good.
- True
- False
A: True

Q: With an NPN transistor, to forward bias the base-emitter junction, the negative lead of the battery must be on the emitter.
- True
- False
A: True

Q: A certain transistor has a collector current of 1.5mA and the emitter has a current of 1.6mA, the base current is
- 3.1mA
- 1.6mA
- 1.5mA
- 0.1mA
A: 3.1mA

Q: A no load condition means that
- the load has infinite resistance
- the output terminals are open
- the load has zero resistance
- answers A and B
A: the load has infinite resistance

Q: A varactor diode exhibits
- a variable capacitance that depends on reverse voltage
- a variable resistance that depends on reverse voltage
- a variable capacitance that depends on forward current
- a constant capacitance over a range of reverse voltages
A: a variable capacitance that depends on reverse voltage

Q: An LED
- emits light when reverse biased
- senses light when reverse biased
- emits light when forward biased
- acts as a variable resistance
A: emits light when reverse biased

Q: For operation as an amplifier, the base of an NPN transistor must be
- positive with respect to the emitter
- negative with respect to the emitter
- positive with respect to the collector
- 0 Volts
A: positive with respect to the emitter

Q: If the base-emitter junction is open, the collector voltage is
- equal to the supply voltage
- 0 volts
- floating
- 0.2 volts
A: equal to the supply voltage

Q: In  cuttoff, V_CE is
- 0 volts
- minimum
- maximum
- equal to supply voltage
- answers A and B
- answers C and D
A: 0 volts

Q: Once in saturation, a further increase in base current will
- cause the collector current to increase
- not effect the collector current
- cause the collector current to decrease
- turn the transistor off
A: cause the collector current to increase

Q: The approximate voltage across the forward-biased base-emitter junction of a silicon BJT is
- 0 volts
- 0.7 volts
- 0.3 volts
- supply voltage
A: 0 volts

Q: The BETA of a transistor can be expressed with which formula
- B = Ic/Ib
- B = E x C
- B = Ie/Ic
- B = Ic/Ie
A: B = Ic/Ib

Q: The cathode of a zener diode in a voltage regulator is normally
- more positive than the anode
- at +0.7 V
- more negative than the anode
- grounded
A: more positive than the anode

Q: The emitter current is always
- greater than the base current
- less than the collector current
- greater than the collector current
- answers A and C
A: greater than the base current

Q: The three terminals of a bipolar junction transistor are called
- p, n, p
- n, p, n
- input, output, ground
- base, emitter, collector
A: p, n, p

Q: When operated in cuttoff and saturation, the transistor acts like
- a linear amplifier
- a switch
- a variable capacitor
- a variable resistor
A: a linear amplifier

Q: Which of the following component(s) normally operate in forward bias
- photodiode
- LED
- varactor
- zener diode
A: photodiode