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Zener Diode Question & Answers

October 11, 2021 By WatElectronics

This article lists 100 Zener Diode MCQs for Engineering Students. All the Zener Diode Questions & Answers given below includes solution and link wherever possible to the relevant topic.

The Zener diodes are the special diodes that are widely used in voltage regulation. The avalanche breakdown and the Zener breakdown are the two types of breakdowns in the Zener diode. The working of a Zener diode is similar to the PN junction diode in forwarding biased conditions.

The avalanche breakdown occurs in lightly doped diodes, in the case of lightly doped diodes when you apply high reverse bias potential the electrons will gain the kinetic energy and they will break the covalent bond and collide with other electrons.

The avalanche and Zener breakdowns are the two types of reverse breakdown in the Zener diode. The Zener breakdown occurs in the thin region, in high doping materials whereas the avalanche breakdown occurs in a thick region. The Zener diode is also called the breakdown voltage of a diode or breakdown diode.

There are three types of Zener analysis are there they are fixed DC voltage & load resistor, fixed DC voltage & variable load resistor, and variable DC voltage & fixed load resistor. The fixed bias current, fixed bias with emitter resistor, collector to base bias circuit, and potential divider bias circuit are the various biasing circuits. The Zener diodes are used in electronic devices, voltage regulators, used as a voltage reference device, etc and they have very high efficiency, they are smaller in size, and less expensive.

1). Which one of the following breakdowns occurs in the thin region?
HintThe Zener breakdown occurs in the thin region, whereas the avalanche breakdown occurs in a thick region
2). Which one of the following breakdowns occurs in high doping material?
HintThe zener breakdown occurs in high doping material
3). Which one of the following breakdown voltages is directly proportional to the temperature?
HintThe avalanche breakdown voltage is directly proportional to the temperature
4). The existence of an electric field is more on the ______________ breakdown
HintThe existence of an electric field is more on the Zener breakdown
5). Which one of the following is a type of reverse breakdown in the zener diode?
HintThe avalanche and Zener breakdowns are the two types of reverse breakdown in the Zener diode
6). ______________ are the few applications of zener diode
HintThe Zener diodes used in electronic devices, voltage regulators, used as a voltage reference device, etc
7). What are the advantages of zener diode?
HintThe Zener diodes have very high efficiency, they are smaller in size, and less expensive
8). In which direction does the zener diode operate?
HintThe Zener diodes can operate in two bias that is in forward and reverse bias
9). In forward bias condition the zener diode will work as a ______________
HintIn forwarding bias condition the Zener diode will work as a conventional diode
10). The L or H is the measuring unit of ____________ parameter
HintThe L or H is the measuring unit of inductance
11). In which breakdown the breakdown voltage decreases with an increase in temperature?
HintIn Zener breakdown, the breakdown voltage decreases with an increase in temperature
12). Which one of the following breakdowns is caused by field ionization?
HintThe Zener breakdown is caused by field ionization
13). The electrons in ______________ breakdown, pulled from valance to conduction band
HintThe electrons in Zener breakdown pulled from valance to conduction band
14). What are the advantages of the series regulator?
HintThe advantages of the series regulator are it has higher current stability and it is simple to design
15). What are the disadvantages of three-terminal regulators?
HintThe disadvantages of three-terminal regulators are they are less efficient, and higher current require larger packages
16). What are the disadvantages of the series regulators?
HintThe disadvantage of the series regulators is they are inefficient
17). An ideal diode in forward bias have _________ resistance
HintAn ideal diode in forwarding bias have zero resistance
18). In which breakdown the breakdown voltage increase with an increase in temperature?
HintIn avalanche breakdown the breakdown voltage increase with an increase in temperature
19). Which one of the following breakdowns is caused by impact ionization?
HintThe avalanche breakdown is caused by impact ionization
20). The change in voltage is given by _______________
HintThe change in voltage is given by ΔVz=ΔIz*Zz
21). What are the advantages of the three-terminal regulators?
HintThe advantages of the three-terminal regulators are it has fewest parts, has lowest output noise, and lowest ripple
22). An ideal diode in reverse bias have _________ resistance
HintAn ideal diode in reverse bias have infinite resistance
23). The PN junction in forward bias offers ______________ resistance
HintThe PN junction in forwarding bias offers very low resistance
24). What are the disadvantages of the zener diode?
HintThe disadvantage of the Zener diode is they have fewer parts, low current, and they are simple in construction
Read more about Diodes
25). The depletion layer in reverse bias is _______________
HintThe depletion layer in reverse bias is thick

Zener Diode Important MCQs

26). The rectifier diode forward voltage drop is between _________________
HintThe rectifier diode forward voltage drop is between 0.7 to 0.9 Volts
27). How many types of zener analyses are there?
HintThere are three types of Zener analysis are there they are fixed DC voltage & load resistor, fixed DC voltage & variable load resistor, and variable DC voltage & fixed load resistor
28). What are the advantages of the three-terminal regulators?
HintThe advantages of the three-terminal regulators are they are lightweight, has higher efficiency, and are small in size
29). The PN junction in reverse bias offers ______________ resistance
HintThe PN junction in reverse bias offers very high resistance
30). Which one of the following has only diodes?
HintThe uncontrolled rectifier have only diodes whereas other rectifiers have thyristors
31). Which one of the following breakdowns occurs in both rectifier and zener diodes?
HintThe avalanche breakdown occurs in both rectifier and Zener diodes
32). The uni-junction transistor is a simple _____________ layer transistor
HintThe uni-junction transistor is a simple two-layer transistor
33). The uni-junction transistor used to trigger _________________
HintThe uni-junction transistor used to trigger SCR, and used within pulse circuitry
34). The depletion layer in forward bias is _______________
HintThe depletion layer in forwarding bias is very thin
35). How many types of MOSFET’S are there?
HintThere are two types of MOSFET’s are there they are enhancement type and depletion type
36). Which one of the following is the unit of DC?
HintThe R=V÷I is the unit of direct current
37). The FET devices are divided into _________________ types
HintThe FET devices are divided into three types they are junction FET, depletion mode, and enhancement mode MOSFET’s
38). ______________ are the various biasing circuits
HintThe fixed bias current, fixed bias with emitter resistor, and collector to base bias circuit, and potential divider bias circuit are the various biasing circuits
39). The three-layer semiconductor devices consists _____________ layers of material
HintThe three-layer semiconductor devices consists of 2-N & 1-P type, and 2-P & 1-N type layers of material
40). The simple PN junction has _____________ types of bias
HintThe simple PN junction has two types of bias they are forward and reverse bias
41). How many types of bias does two PN junction device have?
HintThe two PN junction devices have four types of bias
42). The half-wave rectifier output DC voltage calculated by ____________ formula
HintThe half-wave rectifier output DC voltage calculated by Vpeak/π
43). How many types of resistances are there?
HintThe resistances are of three types they are DC, AC, and average AC resistance
44). The common zener voltages are from ___________
HintThe common Zener voltages are from 1.8 to 200 V
45). The zener operated in reverse bias at PIV is known as ___________
HintThe Zener operated in reverse bias at PIV is known as Zener voltage
46). The current controllable type and voltage controllable type are the two types of ___________ device
HintThe current controllable type and voltage controllable type are the two types of negative resistance device
47). The avalanche breakdown occurs at ____________ volts
HintThe avalanche breakdown occurs at greater than five volts
48). Which one of the following breakdowns occurs in highly doped diodes?
HintThe zener breakdown occurs in highly doped diodes
49). Which one of the following breakdowns has a sharp curve in VI characteristics?
HintThe Zener breakdown has a sharp curve in VI characteristics
50). In _____________ breakdown, when the temperature increases the breakdown voltage decreases
HintIn Zener breakdown, when the temperature increases the breakdown voltage decreases

Zener Diode MCQs for Quiz

51). The temperature coefficient in zener breakdown is _________
HintThe temperature coefficient in Zener breakdown is negative
52). The zener breakdown occurs at ____________ volts
HintThe zener breakdown occurs at less than five volts
53). The doping density is high in ___________ breakdown
HintThe doping density is high in Zener breakdown
54). Which one of the following breakdowns doesn’t affect the voltage?
HintThe zener breakdown doesn’t affect the voltage
55). The advantages of zener diode are ___________
HintThe advantages of Zener diode are it has fewer parts and the construction is simple
Read more about Zener Diode
56). Which one of the following breakdowns occurs in lightly doped diodes?
HintThe avalanche breakdown occurs in lightly doped diodes
57). In _____________ breakdown, when the temperature increases the breakdown voltage increases
HintIn avalanche breakdown, when the temperature increases the breakdown voltage increases
58). The temperature coefficient in avalanche breakdown is _________
HintThe temperature coefficient in avalanche breakdown is positive
59). The production of a pair of holes & electrons takes place in __________ breakdown
HintThe production of a pair of holes & electrons takes place in avalanche breakdown
60). The doping concentration is high in ______________ breakdown
HintThe doping concentration is high in Zener breakdown
61). The electric field is strong in ____________ breakdown
HintThe electric field is strong in Zener breakdown
62). The temperature of zener breakdown and the breakdown voltage is inversely proportional to each other in ______________ breakdown
HintThe temperature of Zener breakdown and the breakdown voltage is inversely proportional to each other in the Zener breakdown
63). Which one of the following is a type of solid dielectric breakdown?
HintThe electrical & thermal breakdown, electrochemical & electromechanical breakdown, and erosion breakdown are the types of solid dielectric breakdown
64). ______________ are the subtypes of electrical breakdown
HintThe intrinsic and avalanche breakdown are the subtypes of electrical breakdown
65). _____________ are the characteristics of intrinsic breakdown
HintThe intrinsic breakdown is valid at low temperature, independent of sample thickness & electrode configuration, and time delay from picosecond to nanosecond
66). ________________ are the few applications of avalanche diode
HintThe voltage reference, microwave frequency generator, and RF noise generator are the few applications of avalanche diode
67). The production of electrons takes place in __________ breakdown
HintThe production of electrons takes place in Zener breakdown
68). ________________ are the few applications of Schottky diode
HintThe power OR circuits, power rectifier, solar cell applications are the few applications of Schottky diode
69). The avalanche breakdown occurs in ________________
HintThe avalanche breakdown occurs in the semiconductor material and insulating materials
70). Which one of the following breakdowns is a type of electron avalanche?
HintThe avalanche breakdown is a type of electron avalanche
71). The zener diode is also called as _____________ diode
HintThe Zener diode is also called the breakdown voltage of a diode or breakdown diode
72). In zener diode the voltage tolerance is typically ___________
HintIn the Zener diode, the voltage tolerance is typically ±5%
73). The maximum power rating in zener diode is _________________
HintThe maximum power rating in zener diode is 2W
74). The avalanche breakdown voltage is ____________ volts for the zener
HintThe avalanche breakdown voltage is six volts for the Zener
75). The voltage after the breakdown is known as ___________ voltage
HintThe voltage after the breakdown is known as Zener voltage

Zener Diode Important MCQ’s for Exams

76). How many types of power supplies are there?
HintThere are two types of power supplies they are regulated and unregulated power supplies
77). The doping density is low in ___________ breakdown
HintThe doping density is low in avalanche breakdown
78). The temperature of avalanche breakdown and the breakdown voltage is inversely proportional to each other in ______________ breakdown
HintThe temperature of avalanche breakdown and the breakdown voltage is inversely proportional to each other in avalanche breakdown
79). ______________ are the basic parts of automatic voltage regulator
HintThe error detecting, stabilizing, and correcting elements are the basic parts of an automatic voltage regulator
80). How many terminals does the zener diode have?
HintThe positive and negative or anode and cathode are the two terminals of the Zener diode
81). Which one of the following is a correct formula for zener maximum current?
HintThe correct formula for Zener maximum current is Pzmax/Vz i.e maximum power dissipation of a Zener divided by Zener voltage
82). Which one of the following breakdowns occurs at relatively low reverse voltage?
HintThe Zener breakdown occurs at a relatively low reverse voltage
83). _____________ formula is used to calculate the minimum zener voltage
HintThe Vz(min)=Vz-ΔVz formula is used to calculate the minimum Zener voltage
84). The electrons in ______________ breakdown, pulled from conduction to valance band
HintThe electrons in avalanche breakdown, pulled from conduction to valance band
85). The minimum value of load resistance is calculated by _____________
HintThe minimum value of load resistance is calculated by Zener voltage divided by maximum load current
86). _____________ formula is used to calculate the minimum zener current
HintThe Iz(max)=Vin-Vz(min)/R formula is used to calculate the minimum Zener current
87). Which one of the following is a correct formula for maximum power dissipation of a zener?
HintThe correct formula for maximum power dissipation of a Zener is Vz*Izmax
88). _____________ formula is used to calculate the maximum zener current
HintThe Iz(max)=Vin-Vz(max)/R formula is used to calculate the maximum Zener current
89). Which one of the following has both diodes and thyristor?
HintThe half controlled rectifier has both diodes and a thyristor
90). Which one of the following is a formula for maximum zener current?
HintThe formula for maximum Zener current is power rating by Zener voltage
91). The R or Ω is the measuring unit of ____________ parameter
HintThe R or Ω is the measuring unit of resistance
92). Which one of the following diodes conducts only in one direction?
HintThe PN junction diode conducts only in one direction
93). Which one of the following is the unit of electrical charge?
HintThe Q=C*V is the unit of electrical charge
94). The FET was known as a _____________ transistor
HintThe FET was known as a unipolar transistor
95). How many types of zener diode regulators are there?
HintThe Zener diode regulators are of two types they are line and load regulation
96). The doping at the junction is minimum in _____________ breakdown
HintThe doping at the junction is minimum in avalanche breakdown
97). The tunneling effect takes place in __________ breakdown
HintThe tunneling effect takes place in Zener breakdown
98). _____________ formula is used to calculate the maximum zener voltage
HintThe Vz(max)=Vz+ΔVz formula is used to calculate the maximum Zener voltage
99). Which one of the following doesn’t have units or dimensions?
HintThe dielectric constant has no dimensions or units
100). In normal diodes, the doping intensity is ____________ compare to zener diode
HintIn normal diodes, the doping intensity is low compare to Zener diodes
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