Diodes and Applications Questions and Answers

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Showing 10 of 64 questions
Q1
What is a varistor?
  • A a voltage-dependent resistor
  • B a voltage-dependent diode
  • C a current-dependent resistor
  • D a current-dependent diode
Answer: Option A
Q2
Which type of transformer is required to create a 180 degree input to a rectifier?
  • A center-tapped secondary
  • B step-down secondary
  • C stepped-up secondary
  • D split winding primary
Answer: Option A
Q3
What circuit activity may shift a characteristic curve so that diode operating points are different?
  • A higher power (heat)
  • B higher resistance
  • C lower voltage
  • D lower current
Answer: Option A
Q4
The dc current through each diode in a bridge rectifier equals:
  • A the load current
  • B half the dc load current
  • C twice the dc load current
  • D one-fourth the dc load current
Answer: Option A
Q5
When matching polarity connections have been made and the potential difference (PD) is above 0.7 V, the diode is considered to be:
  • A not working
  • B forward biased
  • C reverse biased
  • D an open switch
Answer: Option B
Q6
In a power supply diagram, which block indicates a smooth dc output?
  • A transformer
  • B filter
  • C rectifier
  • D regulator
Answer: Option D
Q7
If a 169.7 V half-wave peak has an average voltage of 54 V, what is the average of two full-wave peaks?
  • A 119.9 V
  • B 108.0 V
  • C 115.7 V
  • D 339.4 V
Answer: Option B
Q8
The characteristic curve for the complex model of a silicon diode shows that
  • A the barrier potential is 0 V
  • B the barrier potential stays fixed at 0.7 V
  • C the barrier potential increases slightly with an increase in current
  • D the barrier potential decreases slightly with an increase in current
Answer: Option C
Q9
Since diodes are destroyed by excessive current, circuits must have:
  • A higher voltage sources
  • B current limiting resistors
  • C more dopants
  • D higher current sources
Answer: Option B
Q10
A diode for which you can change the reverse bias, and thus vary the capacitance is called a
  • A varactor diode
  • B tunnel diode
  • C zener diode
  • D switching diode
Answer: Option A

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