EDC - MID-II PRACTICE QUESTIONS
MULTIPLE CHOICE QUESTION AND ANSWERS
======================================================================1. Which of the following type of transistor is preferred in digital and analog electronic circuits?.
Answer is C)
Explanation:MOSFET is preferred in digital and analog electronic circuits because it is faster than all other transistors. Also, it has a very high input impedance.
2. Which one of the following is called as a voltage controlled device
Answer is B)
Whereas the bipolar transistor can be considered a current-controlled device (the current in the base),
the field effect transistor is a voltage-controlled device.
3. Which of the following is true about Zener diode?
Answer is B)
Zener diode is a heavily doped diode. It is used in reverse bias. It has Zener breakdown.
It is used in voltage regulators because it passes an excess amount of current in breakdown mode
by maintaining constant voltage across the load..
4. α is the current gain of __________ configuration .
Answer is A)
Alpha gain (α): In the common-base configuration, the current gain that is defined as the ratio of change in collector current to change in emitter current is known as alpha gain.5. β is the current gain of __________ configuration.
Answer is D)
Beta (β) is the current gain in the common emitter (CE) configuration of a transistor. It's defined as the ratio of the transistor's collector current to its base current: β =Ic/Ib.6. In which region does BJT act as the OFF switch in electronic circuits?
Answer is B)
In the saturation region, the emitter-base junction is forward biased, the collector-base junction is also forward biased. This is the operating mode when no current flows through BJT.7. Which of the following is true about the depletion layer channel in an NMOS electronic circuit?
Answer is C)
When the depletion layer starts moving into the channel, due to the reverse bias of drain and substrate voltage, the inverted charge in the channel decreases from source to drain..8 Which of the following is the correct order of turn-off times?
Answer is A)
Explanation: Electronic devices like MOSFET have the lowest turn-off times (nanoseconds). BJT has turn-off times in between nanoseconds to microseconds. IGBT and SCR have turn-off times of about 1 and 5 microseconds respectively.9.Avanche breakdown occurs when the reverse bais voltage above_______ volts.
Answer is B)
Avalanche breakdown occurs in a p-n junction when the reverse bias voltage (VBR) is greater than 8 volts.10. UJT can be used as ________________________
Answer is C)
Explanation: It is widely used in the triggering circuits for silicon controlled rectifiers..11. SCR turned off when ______
Answer is C)
Explanation:To turn OFF the conducting SCR, the anode or forward current of SCR must be reduced to zero.12. SCR is a __________ device.
Answer is B)
Explanation:The SCR is a semi-controlled device. Turn-on time can be controlled by using a gate pulse but commutation circuit is required to turn off the device.13. Depletion MOSFET can operate in ______
Answer is C)
Explanation: Depletion MOSFET can work in both depletion and enhancement mode.14. A solar cell works on the principle of _________________ effect.
Answer is D)
Explanation:Solar cell works on the principle of photovoltaic effect according to which free electrons are produced when light of certain wavelength is incident on semiconductors.15. A solar cell converts :
Answer is D)
Explanation: A solar cell converts solar energy into electrical energy.16. The control element of an SCR _______________
Answer is A)
Explanation: Gate the control element in the Silicon Controlled Resistor. Gate is used to trigger the device into conduction by the application of a small voltage.17. In the breakdown region, a zener diode behaves like a _______ source.
Answer is A)
Explanation:In the breakdown region, a zener diode behaves like a constant voltage source..18. A zener diode is destroyed if it ________.
Answer is C)
Explanation: A zener diode is destroyed if it Carries more than rated current.19. A PN junction that radiates energy as light instead of as heat is called a_____
Answer is A)
Explanation: A PN junction that radiates energy as light instead of as heat is called a LED20. The transistor acts as an amplifier in the __________ region.
Answer is D)
Explanation: Transistor acts as an amplifier in the active region of its output characteristics.21. The capacitance of a varactor diode increases when reverse voltage across it
Answer is A)
Explanation: The capacitance of a varactor diode increases when reverse voltage across it decreases.22. The device associated with voltage controlled capacitance is a___
Answer is C)
Explanation: The device associated with voltage controlled capacitance is a Varactor diode23. Photo Diode can be used in ______________________
Answer is C)
Explanation: photodiodes can be used in fiber optic receivers to convert weak light signals into electrical signals for processing information..24.In case of enhancement n-channel MOSFETs ______
Answer is C)
Explanation: MOSFETs are commonly used as switches. For example, an enhancement-mode N-channel MOSFET can be used to switch a lamp on and off by adjusting the input gate voltage (Vgs) to a positive voltage to turn it on, and a negative voltage or zero to turn it off.25. What is the main advantage of FET which makes it more useful in industrial applications?
Answer is C)
Explanation: Because of its small size, the IC chips can be made even smaller which reduces the wear and tear. The process technology used with process technology constant a which is the ratio of Width and Length, the FET is made more advantageous.26. BJT is a ___________________ controlled device.
Answer is D)
BJT's are current-driven devices i.e. It is a current-controlled device.
No comments:
Post a Comment