Description : When the potential difference of 4 volt is applied across resistance, 10J energy is converted. Find the charge flows. a. 0.20 C b. 2.5C c. 5C d. 10C
Last Answer : b. 2.5C
Description : The reverse current through semiconductor diode is due to (a) Minority carrier (b) majority carrier (c) electrons (d) holes
Last Answer : (a) Minority carrier
Description : A semiconductor formed by addition of trivalent impurity is : a) P–Type b) N–Type c) Q–type d) M–Type
Last Answer : d) M–Type
Description : On increasing the reverse bias to a large value in a p-n junction diode current (a) Increases slowly (b) Remains fixed (c) Suddenly increases (d) Decreases slowly
Last Answer : (c) Suddenly increases
Description : Which is the most important building block of electronic devices? (a) Diode (b) p-n junction (c) transistor (d) rectifier
Last Answer : b) p-n junction
Last Answer : Avalanche break down in a semiconductor diode occurs when Reverse bias exceeds a certain value
Description : A semiconductor device made up of a single p-n Junction is called a: w) transistor x) diode y) Fet z) integrated circuit
Last Answer : ANSWER: X -- DIODE
Description : An ac voltage is applied across a diode. The tube will conduct when
Last Answer : Positive.
Description : SI unit of gain of amplifier is (a) Volt (b) ampere (c) coulomb (d) dimensionless
Last Answer : (d) dimensionless
Description : The unit of inductance is: a. Volt b. Ampere c. Henry d. Ohm
Last Answer : c. Henry
Description : Farad is defined as: a. Coulomb / volt b. Ampere / volt c. Coulomb / joule d. Joule / Coulomb
Last Answer : d. Joule / Coulomb
Description : The SI unit of charge is: (a) Meter (b) Ampere (c) Coulomb (d) Volt
Last Answer : (c) Coulomb
Description : A modern power semiconductor device IGBT is combines the characteristics of a) BJT and MOSFET b) FCT and GTO c) SCR and MOSFET d) SCR and BJT
Last Answer : Ans: BJT and MOSFET
Description : Semiconductor germanium and silicon are (a) Pentavalent (b) trivalent (c) divalent (d) tetravalent
Last Answer : (d) tetravalent
Description : A doped semiconductor is called : a) Extrinsic b) Intrinsic c) Insulator d) Conductor
Last Answer : b) Intrinsic
Description : The process of addition of impurity in pure semiconductor is : a) Doping b) Radiating c) Mixing d) Insulating
Last Answer : d) Insulating
Description : A potential difference of V = 100 ± 2 volt, when applied across a resistance R gives a current of 10 ± 0.5 ampere.
Last Answer : A potential difference of V = 100 2 volt, when applied across a resistance R gives a current of 10 ... percentage error in R given by R = V/I.
Description : What type of PN diode is formed by using a fine metal wire and a section of N-type semiconductor material?
Last Answer : Point-contact.
Description : What is a zener diode?
Last Answer : A zener diode is a special kind of diode which allows current to flow in the forward direction in the same manner as an ideal diode, but will also permit it to flow in the reverse direction when ... is above a certain value known as the breakdown voltage, "zener knee voltage" or "zener voltage."
Description : What is a diode?
Last Answer : In electronics, a diode is a two-terminal electronic component with asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally ... a crystalline piece of semiconductor material with a p-n junction connected to two electrical terminals
Description : A device based on photo electric effect is called a) Photo sensitive b) Photo diode c) Photo synthesis d) Photo cell
Last Answer : d) Photo cell
Description : A light emitting diode emits light only when (a) Reversed biased (b) forward biased (c) unbiased (d) none
Last Answer : (b) forward biased
Description : Forward current through a semi-conductor diode circuit is due to ________ (a) Minority carriers (b) majority carriers (c) holes (d) electrons
Last Answer : (b) majority carriers
Description : A circuit which develops voltage across the horizontal deflection plates is known as a) Time base generator b) Electron gun c) Thermionic diode d) Zener diode
Last Answer : a) Time base generator
Description : In the reverse biased p-n junction, the current is of the order of (a) Ampere (b) Milliampere (c) Microampere (d) Nano-ampere
Last Answer : (d) Nano-ampere
Description : P-n junction when reversed biased acts as a (a) Capacitor (b) inductor (c) on switch (d) off switch
Last Answer : d) off switch
Description : In p-n-p transistor, collector current is (a) Equal to emitter current (b) slightly less than emitter current (c) greater than emitter current (d) any of above
Last Answer : (c) greater than emitter current
Description : In n-p-n transistor, p works as ________ (a) Collector (b) emitter (c) base (d) any of above
Last Answer : c) base
Description : In a P-N diode, assume that P-side is lightly doped and N-side is heavily doped. Based on this information, which of the following statement is true ? (A) Depletion region is more extended in ... (C) Depletion region would be equal on both sides (D) Not enough information provided to give answer
Last Answer : In a P-N diode, assume that P-side is lightly doped and N-side is heavily doped. Based on this information, which of the following statement is true ? (A) Depletion region is more extended ... (C) Depletion region would be equal on both sides (D) Not enough information provided to give answer
Description : When a reverse bias is applied to a diode, it will a. Raise the potential barrier b. Lower the potential barrier c. Increases the majority-carrier a current greatly d. None of these
Last Answer : a. Raise the potential barrier
Description : A forward potential of 10V is applied to a Si diode. A resistance of 1 KΩ is also in series with the diode. The current is a. 10 mA b. 9.3 mA c. 0.7 mA d. 0
Last Answer : b. 9.3 mA
Description : A forward potential of 10V is applied to a Si diode. A resistance of 1 KΩ is in series with the diode. The current through the diode is
Last Answer : A forward potential of 10V is applied to a Si diode. A resistance of 1 KΩ is in series with the diode. The current through the diode is 9.3 mA
Description : Turn ratio of a transformer is 5. If 220 V AC is applied to its primary coil, voltage in the secondary coil will be: a. 44V b. 4.4 V c. 220V d. 1100V
Last Answer : c. 220V
Description : When a uniform magnetic field B is applied to a current carrying coil, the coil will rotate in such a manner that its plane a) becomes parallel to B b) becomes anti-parallel to B c) makes an angle of 600 with B d) becomes perpendicular to B
Last Answer : d) becomes perpendicular to B
Description : When an iron piece is placed in a magnetic field (a) the magnetic lines of force will bend away from their usual paths in order to go away from the piece (b) the magnetic lines of force will bend ... to pass through the piece (c) the magnetic field will not be affected (d) the iron piece will break
Last Answer : (b) the magnetic lines of force will bend away from their usual paths in order to pass through the piece
Description : The substance which undergo plastic deformation until break is a) Brittle b) Ductile c) Hard d) Soft
Last Answer : d) Soft
Description : The substance which break just after elastic limit: a) Ductile b) Brittle c) Soft d) Hard
Last Answer : d) Hard
Description : The ionisation potential of hydrogen atom is `13.6` volt. The energy required to remove an electron in the `n = 2` state of the hydrogen atom is
Last Answer : The ionisation potential of hydrogen atom is `13.6` volt. The energy required to remove an electron in the `n = 2` ... . 13.6 eV C. 6.8 eV D. 3.4 eV
Description : As shown in the illustration, the circuit has been on the line for several days when component 'E1' burns out. The operator receives an alarm, switches over 'B' to energize the standby ... than required for the circuit therefore limiting the current through the alarm relay which will not pick up
Last Answer : Answer: D
Description : Which of the following is a vector quantity ? (a) Relative permeability (b) Magnetic field intensity (c) Flux density (d) Magnetic potential
Last Answer : (b) Magnetic field intensity
Description : If energy of incident photon is greater than the rest mass energy of electron positron pair, the surplus energy is shared by the pair as, a) Potential energy b) Thermal energy c) Electronic energy d) Kinetic energy
Last Answer : d) Kinetic energy
Description : The potential difference set up across the depletion region is called (a) Absolute potential (b) neutral potential (c) reverse potential (d) potential barrier
Last Answer : (d) potential barrier
Description : In forward bias, the width of potential barrier __________ (a) Increases (b) decreases (c) remains same (d) no effect
Last Answer : (b) decreases
Description : The potential barrier for germanium is _______ (a) 0.6 V (b) 0.2 V (c) 0.3 V (d) 0.5 V
Last Answer : (c) 0.3 V
Description : Alternating current generator converts.......... energy into electrical energy? a. mechanical energy b. chemical energy c. solar energy d. potential energy
Last Answer : a. mechanical energy
Description : The anodes in a CRO are at ___________ potential with respect to the cathode a) negative b) high negative c) high positive d) positive
Last Answer : c) high positive
Description : A multipurpose instrument for measuring current, potential difference and resistance is a) Ohmmeter b) Astatic galvanometer c) Rheostat d) AVO Meter
Last Answer : d) AVO Meter
Description : Terminal potential difference of a battery is greater than its emf when a. the internal resistance of battery is infinite b. the internal resistance of battery is zero c. the battery is charged d. the battery is discharged
Last Answer : c. the battery is charged
Description : All electrical appliances are connected in parallel to each other between the main line and neutral wire to get a. same current b. same current and potential difference c. different current but same potential difference d. different current and potential differences
Last Answer : c. different current but same potential difference
Description : In the following figure, the terminal potential is a. zero b. 2V c. 12V d. 36V
Last Answer : a. zero