Q1. A D-MOSFET can operate in the
(A) Depletion-mode only
(B) Enhancement-mode only
(C) Depletion-mode or enhancement-mode
(D) Low-impedance
Answer: Depletion-mode or enhancement-mode
Explanation:
Q2. The extremely high input impedance of a MOSFET is primarily due to the
(A) absence of its channel
(B) negative gate-source voltage
(C) depletion of current carriers
(D) extremely small leakage current of its gate capacitor
Answer: extremely small leakage current of its gate capacitor
Explanation:
Q3. A JFET is a driven by
(A) current
(B) voltage
(C) both current and voltage
(D) none of the above
Answer: voltage
Explanation:
Q4. A depletion MOSFET differs from a JFET in the sense that it has no
(A) channel
(B) gate
(C) P-N junction
(D) Substrate
Answer: channel
Explanation:
Q5. IGFET is a
(A) Square-law device
(B) Half-power device
(C) Linear device
(D) All of these
Answer: Square-law device
Explanation:
Q6. In a MOSFET, the polarity of the inversion layer is the same as that of the
(A) charge on the gate electrode
(B) minority carriers in the drain
(C) majority carries in the substrate
(D) majority carries in the source/drain
Answer: majority carries in the source/drain
Explanation:
Q7. The operation of JFET is similar to the valve
(A) diode
(B) pentode
(C) triode
(D) tetrode
Answer: pentode
Explanation:
Q8. In MOSFET devices the N-channel type is better than P-channel type in the following respects
(A) it has better noise immunity
(B) it is faster
(C) it is TTL compatible
(D) it has better drive capability
Answer: it is faster
Explanation:
Q9. MOSFET uses the electric field of
(A) gate capacitance to control the channel current
(B) barrier potential of p-n junction to control the channel current
(C) both of these
(D) none of these
Answer: gate capacitance to control the channel current
Explanation:
Q10. Input impedance of MOSSFET is
(A) less than that of FET but more than BJT
(B) more than that of FET and BJT
(C) more than that of FET but less than BJT
(D) less than that of FET and BJT
Answer: more than that of FET and BJT
Explanation:
Q11. A JFET has three terminals, namely
(A) cathode, anode, grid
(B) emitter, base, collector
(C) source, drain, gate
(D) none of these
Answer: source, drain, gate
Explanation:
Q12. A JFET has three terminals, namely
(A) cathode, anode, grid
(B) emitter, base, collector
(C) source, drain, gate
(D) none of these
Answer: source, drain, gate
Explanation:
Q13. Another name for zenar diode is
(A) voltage
(B) current
(C) power
(D) breakdown
Answer: breakdown
Explanation:
Q14. FET is a
(A) Current controlled device
(B) Voltage controlled device
(C) Both
(D) None
Answer: Voltage controlled device
Explanation:
Q15. FET is
(A) Bipolar
(B) Unipolar
(C) Polar
(D) None
Answer: Unipolar
Explanation:
Q16. A SCHOTTKY diode is a
(A) Majority carrier
(B) Minority carrier
(C) Fast recovery diode
(D) Both majority and a minority carrier diode
Answer: majority carrier
Explanation:
Q17. What is SCR
(A) series controlled rectifier
(B) serial controlled rectifier
(C) silicon controlled rectifier
(D) none of these
Answer: silicon controlled rectifier
Explanation:
Q18. what is UJT
(A) uni directional device
(B) bi directional device
(C) tri directional device
(D) none of these
Answer: uni directional device
Explanation: A silicon controlled rectifier or semiconductor-controlled rectifier is a four-layer solid-state current-controlling device. SCRs are unidirectional devices (i.e. can conduct current only in one direction) as opposed to TRIACs, which are bidirectional (i.e. current can flow through them in either direction). SCRs can be triggered normally only by currents going into the gate as opposed to TRIACs, which can be triggered normally by either a positive or a negative current applied to its gate electrode. There are three modes of operation for an SCR depending upon the biasing given to it: Forward blocking mode (off state), Forward conduction mode (on state), Reverse blocking mode (off state)
Q19. once scr start conducting a forward current, its gate losed control over
(A) amode circuit voltage only
(B) anode circuit current only
(C) anode circuit voltage and current
(D) anode circuit voltage ,current and time
Answer: anode circuit voltage and current
Explanation: A unijunction transistor (UJT) is a three-lead electronic semiconductor device with only one junction that acts exclusively as an electrically controlled switch. The UJT is not used as a linear amplifier. It is used in free-running oscillators, synchronized or triggered oscillators, and pulse generation circuits at low to moderate frequencies. It is widely used in the triggering circuits for silicon controlled rectifiers. The low cost per unit, combined with its unique characteristic, have warranted its use in a wide variety of applications like oscillators, pulse generators, saw-tooth generators, triggering circuits, phase control, timing circuits, and voltage- or current-regulated supplies.
Q20. A JFET is a
(A) Tripolar
(B) unipolar
(C) bipolar
(D) none of these
Answer: unipolar
Explanation:
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