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Electronic devices and circuits
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q41 ⇒ Discrete transistors T1 and T2 having maximum collector current rating of 0.75 amp are connected in parallel as shown in the figure, this combination is treated as a single transistor to carry a total current of 1 ampere, when biased with self bias circuit. When the circuit is switched on, T1 draws 0.55 amps and T2 draws 0.45 amps. If the supply is kept on continuously, ultimately it is very likely T1 Will get damaged and T2 will be safe [other wrong options] [Discuss in forum] Both T1, and T2 get damaged Both T1, and T2 will be safe. T2 will get damaged and T1, will be safe. |
Q42 ⇒ A varactor diode is reverse biased [other wrong options] [Discuss in forum] forward biased biased to breakdown unbiased |
Q43 ⇒ The number of doped regions in PIN diode is 2 [other wrong options] [Discuss in forum] 1 3 1 or 2 |
Q44 ⇒ Assertion (A): A high junction temperature may destroy a diode. Reason (R): As temperature increases the reverse saturation current increases. Both A and R are true and R is correct explanation of A [other wrong options] [Discuss in forum] Both A and R are true but R is not a correct explanation of A A is true but R is false A is false but R is true |
Q45 ⇒ Assertion (A): The conductivity of an n type semiconductor increases with increase in temperature and increase in density of donor atoms. Reason (R): Diffusion of carriers occurs in semiconductors. Both A and R are true but R is not a correct explanation of A [other wrong options] [Discuss in forum] Both A and R are true and R is correct explanation of A A is true but R is false A is false but R is true |
Q46 ⇒ If aac for transistor is 0.98 then βac is equal to 49 [other wrong options] [Discuss in forum] 51 47 45 |
Q47 ⇒ The most important set of specifications of transformer oil includes dielectric strength, flash point and viscosity [other wrong options] [Discuss in forum] dielectric strength and viscosity dielectric strength and flash point flash point and viscosity |
Q48 ⇒ At room temperature the current in an intrinsic semiconductor is due to holes and electrons [other wrong options] [Discuss in forum] holes electrons ions |
Q49 ⇒ In which condition does BJT behave like a closed switch? Saturation [other wrong options] [Discuss in forum] Cut off Forward active Reverse active |
Q50 ⇒ Secondary emission is always decremental. FALSE [other wrong options] [Discuss in forum] TRUE |
Q51 ⇒ Electrons can be emitted from a metal surface due to high electric field. TRUE [other wrong options] [Discuss in forum] FALSE |
Q52 ⇒ In the circuit of figure the function of resistor R and diode D to limit the current and protect LED against reverse breakdown voltage. [other wrong options] [Discuss in forum] to limit the current and to protect LED against over voltage to limit the voltage and to protect LED against over current none of the above. |
Q53 ⇒ Ferromagnetic materials exhibit a non-linear B-H behaviour [other wrong options] [Discuss in forum] a linear B-H behaviour an exponential B-H behaviour none of the above |
Q54 ⇒ In which region of a CE bipolar transistor is collector current almost constant? Active region [other wrong options] [Discuss in forum] Saturation region Breakdown region Both saturation and active region |
Q55 ⇒ GaAs has an energy gap 1.43 eV the optical cut off wavelength of GaAs would lie in the infrared region of the spectrum [other wrong options] [Discuss in forum] visible region of the spectrum ultraviolet region of the spectrum for ultraviolet region of the spectrum |
Q56 ⇒ As compared to an ordinary semiconductor diode, a Schottky diode has higher reverse saturation current and lower cut in voltage [other wrong options] [Discuss in forum] has higher reverse saturation current has higher reverse saturation current and higher cut in voltage has lower reverse saturation current and lower cut in voltage |
Q57 ⇒ Secondary emission occurs in tetrode [other wrong options] [Discuss in forum] diode triode pentode |
Q58 ⇒ Which of the following is used for generating time varying wave forms? UJT [other wrong options] [Discuss in forum] MOSFET PIN diode Tunnel diode |
Q59 ⇒ Which of these has a layer of intrinsic semiconductor? PIN diode [other wrong options] [Discuss in forum] Zener diode Photo diode Schottky diode |
Q60 ⇒ In a bipolar transistor which current is largest emitter current [other wrong options] [Discuss in forum] collector current base current base current or emitter current |
Or |