MCQOPTIONS
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MCQOPTIONS
This section includes 130 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
*/*_In a bipolar transistor, the emitter base junction has? |
| A. | Forward bias |
| B. | Reverse bias |
| C. | Zero bias |
| D. | Zero or reverse bias |
| Answer» B. Reverse bias | |
| 102. |
*/*_As compared to bipolar junction transistor, a FET? |
| A. | Is less noisy |
| B. | Has better thermal stability |
| C. | Has higher input resistance |
| D. | All of the above |
| Answer» E. | |
| 103. |
*/*_Piezoelectric quartz crystal resonators find application where? |
| A. | Signal amplification is required |
| B. | Rectification of the signal is required |
| C. | Signal frequency control is required |
| D. | Modulation of signal is required |
| Answer» C. Signal frequency control is required | |
| 104. |
*/*_Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is? |
| A. | Normal to both current and magnetic field |
| B. | In the direction of current |
| C. | Antiparallel to magnetic field |
| D. | In arbitrary direction |
| Answer» B. In the direction of current | |
| 105. |
*/*_An electron in the conduction band? |
| A. | Has higher energy than the electron in the valence band |
| B. | Has lower energy than the electron in the valence band |
| C. | Loses its charge easily |
| D. | Jumps to the top of the crystal |
| Answer» B. Has lower energy than the electron in the valence band | |
| 106. |
_ The dynamic resistance of a forward biased p-n diode$? |
| A. | Varies inversely with current |
| B. | Varies directly with current |
| C. | Is constant |
| D. | Is either constant or varies directly with current |
| Answer» B. Varies directly with current | |
| 107. |
_ Which of the following has highest resistivity?$? |
| A. | Mica |
| B. | Paraffin wax |
| C. | Air |
| D. | Mineral oil |
| Answer» D. Mineral oil | |
| 108. |
_ Light dependent resistors are$? |
| A. | Highly doped semiconductor |
| B. | Intrinsic semiconductor |
| C. | Lightly doped semiconductor |
| D. | Either A or B |
| Answer» D. Either A or B | |
| 109. |
_ In a semiconductor diode, the barrier offers opposition to$? |
| A. | Holes in P-region only |
| B. | Free electrons in N-region only |
| C. | Majority carriers in both regions |
| D. | Majority as well as minority carriers in both regions |
| Answer» D. Majority as well as minority carriers in both regions | |
| 110. |
_ Which of the following could be the maximum current rating of junction diode by 126?$? |
| A. | 1 A |
| B. | 10 A |
| C. | 20 A |
| D. | 100 A |
| Answer» B. 10 A | |
| 111. |
_ In which of these is reverse recovery time nearly zero?$? |
| A. | Zener diode |
| B. | Tunnel diode |
| C. | Schottky diode |
| D. | PIN diode |
| Answer» D. PIN diode | |
| 112. |
_ For a P-N diode, the number of minority carriers crossing the junction depends on$? |
| A. | Forward bias voltage |
| B. | Potential barrier |
| C. | Rate of thermal generation of electron hole pairs |
| D. | None of the above |
| Answer» D. None of the above | |
| 113. |
_In an ideal diode there is no breakdown, no __________ current, and no forward __________ drop.$? |
| A. | Reverse, voltage |
| B. | Forward, current |
| C. | Forward, voltage |
| D. | Reverse, current |
| Answer» B. Forward, current | |
| 114. |
_If too large current passes through the diode$? |
| A. | All electrons will leave |
| B. | All holes will freeze |
| C. | Excessive heat may damage the diode |
| D. | Diode will emit light |
| Answer» D. Diode will emit light | |
| 115. |
_How many free electrons does a p type semiconductor has?$? |
| A. | Only those produced by thermal energy |
| B. | Only those produced by doping |
| C. | Those produced by doping as well as thermal energy |
| D. | Any of the above |
| Answer» B. Only those produced by doping | |
| 116. |
_Assertion (A): A VMOS can handle much larger current than other field effect transistors.Reason (R): In a VMOS the conducting channel is very narrow.$? |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» D. A is false but R is true | |
| 117. |
_Which one of the following is not a characteristic of a ferroelectric material?$? |
| A. | High dielectric constant |
| B. | No hysteresis |
| C. | Ferroelectric characteristic only above the curie point |
| D. | Electric dipole moment |
| Answer» D. Electric dipole moment | |
| 118. |
Assertion (A): A JFET can be used as a current source.Reason (R): In beyond pinch off region the current in JFET is nearly constant.$? |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not a correct explanation of A | |
| 119. |
A thermistor is a$? |
| A. | Thermocouple |
| B. | Thermometer |
| C. | Miniature resistance |
| D. | Heat sensitive explosive |
| Answer» D. Heat sensitive explosive | |
| 120. |
Assertion (A): In p-n-p transistor collector current is termed negative.Reason (R): In p-n-p transistor holes are majority carriers.$? |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 121. |
An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased$? |
| A. | The number of free electrons increases |
| B. | The number of free electrons increases but the number of holes decreases |
| C. | The number of free electrons and holes increase by the same amount |
| D. | The number of free electrons and holes increase but not by the same amount |
| Answer» D. The number of free electrons and holes increase but not by the same amount | |
| 122. |
The sensitivity of human eyes is maximum at$? |
| A. | White portion of spectrum |
| B. | Green portion of spectrum |
| C. | Red portion of spectrum |
| D. | Violet portion of spectrum |
| Answer» C. Red portion of spectrum | |
| 123. |
Forbidden energy gap in germanium at 0 K is about$? |
| A. | 10 eV |
| B. | 5 eV |
| C. | 2 eV |
| D. | 0.78 eV |
| Answer» E. | |
| 124. |
Permalloy is$? |
| A. | A variety of stainless steel |
| B. | A polymer |
| C. | A conon-ferrous alloy used in aircraft industry |
| D. | A nickel an iron alloy having high permeability |
| Answer» E. | |
| 125. |
A thermistor is a? |
| A. | Thermocouple |
| B. | Thermometer |
| C. | Miniature resistance |
| D. | Heat sensitive explosive |
| Answer» D. Heat sensitive explosive | |
| 126. |
An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased? |
| A. | The number of free electrons increases |
| B. | The number of free electrons increases but the number of holes decreases |
| C. | The number of free electrons and holes increase by the same amount |
| D. | The number of free electrons and holes increase but not by the same amount |
| Answer» D. The number of free electrons and holes increase but not by the same amount | |
| 127. |
Assertion (A): In p-n-p transistor collector current is termed negative.Reason (R): In p-n-p transistor holes are majority carriers.? |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 128. |
Forbidden energy gap in germanium at 0 K is about? |
| A. | 10 eV |
| B. | 5 eV |
| C. | 2 eV |
| D. | 0.78 eV |
| Answer» E. | |
| 129. |
The sensitivity of human eyes is maximum at? |
| A. | White portion of spectrum |
| B. | Green portion of spectrum |
| C. | Red portion of spectrum |
| D. | Violet portion of spectrum |
| Answer» C. Red portion of spectrum | |
| 130. |
Permalloy is? |
| A. | A variety of stainless steel |
| B. | A polymer |
| C. | A conon-ferrous alloy used in aircraft industry |
| D. | A nickel an iron alloy having high permeability |
| Answer» E. | |