Description : The process of conversion of AC into DC is called (a) Amplification (b) rectification (c) purification (d)magnification
Last Answer : (b) rectification
Description : Depletion region of a junction is formed _________ (a) during the manufacturing process (b) under forward bias (c) under reverse bias (d) when temperature varies
Last Answer : (a) during the manufacturing process
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 : In forward bias, the width of potential barrier __________ (a) Increases (b) decreases (c) remains same (d) no effect
Last Answer : (b) decreases
Description : Photo diode operates in the _______ condition (a) Forward bias (b) null (c) both a & d (d) reverse bias
Last Answer : (d) reverse bias
Description : For which one of the following, 'Diodes' are generally used for? (1) Rectification (2) Amplification (3) Modulation (4) Filtration
Last Answer : (1) Rectification Explanation: In electronics, a diode is an electronic device that allows current to flow in one direction only. It is mainly used as a rectifier diode that lets ... used for power supply operation. Rectifier diodes are used for changing alternating current into direct current.
Description : For which one of the following, "Diodes' are generally used for? (1) Rectification (2) Amplification (3) Modulation (4) Filtration
Last Answer : (1) Rectification Explanation: A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
Description : For which one of the following, ‘Diodes’ are generally used for? (1) Rectification (2) Amplification (3) Modulation (4) Filtration
Last Answer : Rectification
Description : When using an ohmmeter to test a semiconductor diode, you find a low resistance in both the forward and reverse bias directions. This indicates that the diode has a/an ____________. A. open B. short C. good resistive quality D. good capacitive quality
Last Answer : Answer: B
Description : Which of the following statement is false (a). Enzymes are differentiated by electrophoresis method (b). While DNA sequencing both forward and reverse primers are used (c). Amplification is done through PCR (d). ABO blood grouping is mainly used for differentiating individuals
Last Answer : Ans: (b). While DNA sequencing both forward and reverse primers are used
Description : For normal operation of a transistor, the collector base junction is kept (a) Unbiased (b) forward biased (c) reverse biased (d) none
Last Answer : (c) reverse biased
Description : Junction breakdown occurs: a) With forward bias b) With reverse bias c) Under high temperature condition d) Because of excess heating of the diode
Last Answer : Ans: B
Description : Laser is the acronym for a) Light Amplification by Stimulated Emission of Radiation b) Light Amplification by Spontaneous Emission of Radiation c) Light Amplified by Stimulated Emission of Radiation d) Light Amplification by Standard Emission of Radiation
Last Answer : a) Light Amplification by Stimulated Emission of Radiation
Description : In the illustration, the small battery and Rb are in the circuit to apply ________. EL-0022 A. forward bias to the emitter-base B. reverse bias to the emitter-base C. a 'reference charge' on the input capacitor D. a buffer between the input ground and the emitter ground
Last Answer : Answer: A
Description : In the illustration, the large battery and R(L) are in the circuit to ________. EL-0022 A. forward bias the emitter-base B. reverse bias the emitter-base C. forward bias the emitter/collector D. reverse bias the emitter/collector
Last Answer : Answer: D
Description : A device used to avoid the relay destroying the op-amp is A. diode B. LED C. reverse bias diode D. forward biased diode
Last Answer : reverse bias diode
Description : Both LEDs and ILDs operate correctly with ∙ A. forward bias ∙ B. reverse bias ∙ C. neither forward nor reverse bias ∙ D. either forward or reverse bias
Last Answer : A. forward bias
Description : Photodiodes operate properly with ∙ A. forward bias ∙ B. reverse bias ∙ C. neither forward nor reverse bias ∙ D. either forward or reverse bias
Last Answer : ∙ B. reverse bias
Description : Photodiodes operate property with ∙ a. Forward bias ∙ b. Reverse bias ∙ c. Neither A or B ∙ d. Either A or B
Last Answer : ∙ b. Reverse bias
Description : Both LEDs and ILDs operate correctly with ∙ a. Forward bias ∙ b. Reverse bias ∙ c. Neither A or B ∙ d. Either A or B
Last Answer : a. Forward bias
Description : Avalanche breakdown in a diode occurs when a. Potential barrier is reduced to zero. b. Forward current exceeds certain value. c. Reverse bias exceeds a certain value. d. None of these
Last Answer : c. Reverse bias exceeds a certain value.
Description : Define i)P-N junction diode ii) Depletion layer iii)Forward bias iv)Reverse bias of P-N junction diode
Last Answer : i)P-N junction diode: It is a semiconductor device in which half of its region is P-type and other half is N-type. ii) Depletion layer: The region where free electrons and free holes are absent ... and negative terminal is connected to p-side of p-n junction diode, it is said to be reverse bias.
Description : What is the difference between forward and reverse bias?
Last Answer : Forward bias is a PN junction bias which allows current to flow through the junction. Forward bias decreases the resistance of the depletion layer. Reverse bias is a PN junction bias that allows only ... Positive polarity on the n-type material and negative polarity to the p-type material.
Description : The reverse process of photo-electric effect is called: a) Annihilation of matter b) Compton effect c) Pair production d) X-rays
Last Answer : d) X-rays
Description : The operational amplifier is _______ (a) High gain amplifier (b) high power amplifier (c)high resistance amplifier (d)low resistance amplifier
Last Answer : a) High gain amplifier
Description : Non-inverting amplifier circuits have _______ (a) Very high input impedance (b) very low input impedance (c) low output impedance (d) none of above
Last Answer : (a) Very high input impedance
Description : A diode in which the change in reverse bias voltage varies the capacitance is called as A) Varactor diode B) Switching diode C) Tunnel diode D) Zener-diode
Last Answer : A diode in which the change in reverse bias voltage varies the capacitance is called as Varactor diode
Description : The width of depletion layer of a P-N junction – (1) decreases with light doping (2) increases with heavy doping (3) is independent of applied voltage (4) is increased under reverse bias
Last Answer : (4) is increased under reverse bias Explanation: The total width of the depletion region is a function of applied reverse-bias and impurity concentration. Forward bias decreases the depletion region width whilst reverse bias increases it.
Description : The width of depletion layer of a P-N junction (1) decreases with light doping (2) increases with heavy doping (3) is independent of applied voltage (4) is increased under reverse bias
Last Answer : is increased under reverse bias
Description : Photodiodes used as fiber optic directors are a. Unbiased to generate a voltage same as a solar cell b. Forward bias c. Reversed bias d. Thermoelectrically cooled
Last Answer : c. Reversed bias
Description : A, when there is an increase in the input voltage, the forward bias of Q1 increases/decreases (which one).
Last Answer : Increases.
Description : Photodiodes used as fiber optic directors are ∙ a. Unbiased to generate a voltage same as a solar cell ∙ b. Forward bias ∙ c. Reversed bias ∙ d. Thermoelectrically cooled
Last Answer : ∙ c. Reversed bias
Description : How do you test reverse power trip, high current trip, preferential trip?
Last Answer : Reverse power trip - refer answer for question 11. Also ask E/O. High current (over load trip) - Set your overload relay high current trip setting to say 75% of the rated current. Run the ... loads to overload the generator. Preferential trip will trip all the non-critical loads. Also ask E/O.
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 : For a binary mixture with low relative volatility, continuous rectification to get pure products will require (A) Low reflux ratio (B) Less number of trays (C) Small cross-section column (D) High reflux ratio
Last Answer : (D) High reflux ratio
Description : Why is this reverse power used instead of reverse current in alternators?
Last Answer : It is extremely difficult to detect reverse current with an alternating current system, reverse power can be detected and protection can be provided by reverse power relay.
Description : How do you test reverse power trip?
Last Answer : When two generators are running in parallel and one generator can carry the load, reverse power trip can be tested by load shifting using governor control. When the load has shifted sufficiently and the off ... (using the test push button on the relay) to see if it initiates a trip signal.
Description : How is the protection against reverse power given?
Last Answer : Reverse power protection is used for anti-motoring. This function is used for protection of prime mover not generator. It can cut-off the fuel supply and stop the prime mover.
Description : What is the harm if reverse power flows?
Last Answer : Assume that the generator normally produces an amount of power equal to P, and that when operating as a motor, it will absorb a similar amount, P. Therefore, the net effect on the grid will ... change on the grid. There could be prime mover damage in some instances (especially steam turbines).
Description : When does Reverse power flow?
Last Answer : Situation of a generator is feeding a system through switchgear having several generators connected in parallel with this generator. The flow of current, when the system is running normally, is from the ... minor to extreme in the event of a complete mechanical failure of the generator which fails.
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 : 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 : Which of the following steps is/are not required for analog to digital conversion ? (a) Sensing (b) Conversion (c) Amplification (d) Conditioning (e) Quantization Codes : (A) (a) and (b) (B) (c) and (d) (C) (a), (b) and (e) (D) None of the above
Last Answer : (D) None of the above
Description : If PN junction is forward biased its resistance is (a) Zero (b) Infinity (c) A few ohm (d) A few kilo ohms
Last Answer : c) A few ohm
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
Last Answer : 10 ohm
Description : A fuse is placed in series with the cireuit to protect against a. high power b. high voltage c. high current d. over heating
Last Answer : d. over heating
Description : Why is it cheaper to transmit electrical energy at high voltage?
Last Answer : Because of the electrical energy was step upped by transformers the transformer have high efficiency than the electric energy is cheaper
Description : An OP-AMPs can amplify _______ (a) D.C (b) A.C (c) both A.C & D.C (d) none of above
Last Answer : b) A.C