Preparatory EM Qp-1 PDF

EM Question bank corr Sl...

EM Question bank corr Sl ect questions option 1 option 2 option 3 option 4 NO opti on Mater is a substance which ____________ and occupies sea, has 1 Occupies space, has vacuum occupies space, has mass Occupies land, has mass 2 ____________ vacuum Matter is made of smallest particle called 2 molecules material holes electrons 1 ____________ Molecules are made of smallest particle called 3 holes protons atoms neutrons 2 ____________ Nucleus consists of ____________ and 4 proton and neutron electron and neutron atom and neutron proton and electron 1 ____________ 5 The Electron revolve around the ____________ space nucleus nutron protron 2 neutrally charged or no neutrally charged or negative 6 Neutron is ____________ positively Negatively 1 charge charge 7 Electron are ____________ charged Neutrally Progressively charged negatively charged not charged 3 8 Protons are ____________ Positively charged Progressively charged negatively charged not charged 1 Electrons revolve around Nucleus in different 9 charges Orbit sizes bits 2 ____________ The Electrons in the outermost orbit is called 10 valance electrion last electron first electron orbit electron 1 ____________ The output stage of a multistage amplifier is also 11 mixer stage power amlifier stage detector stage R.F amplifier stage 2 called __________coupling is generally employed in 12 transformer RC direct impedance 1 power amplifier 13 A class A power amplifier uses two transistors three transistors one transistors none of the above 3 14 The maximum efficienty of class C amplifier is 78.50% 50% 30% 85% 4 The maximum efficiency of transformer coupled 15 30% 50% 80% 45% 2 class A power amplifier is Class_____power amplifier has the highest 16 C A B AB 1 collector efficiency Power amplifier handle________signals 17 small very small large none of the above 3 compared to voltage amplifiers In class A operation,the operating point is 18 at cut off point at the middle at saturation point none of the above 2 generally located________of the d.c.load line 19 Class C amplifiers are used as AF amplifiers detectors R.F.amplifiers none of the above 3 20 The number of levels in a digital signal are One Two Three Four 2 Which of the following can provide a digital Slow change in the value of 21 Gradual turning of a pot Sine wave Square wave 4 signal? resistor 22 IC stands for__________ Implemented circuit Inverted circuit Integrated Circuit Inter-connected 3 23 RTL, DTL and TTL are types of _________ Basic family Universal family Exclusive family Logic family 4 24 Which family of logic circuits uses FETs? TTL CMOS Both TTL & CMOS Neither TTL nor 2 25 Stereophony means ____________ Three dimensional sound Two dimensional sound Mono dimensional sound All dimensional 1 In_________ system one amplifier is used to 26 combine all signal from the different microphone Stereophonic Nan phonic Monophonic Quadraphonic 3 and produces one resultant signal The advantage of surround sound system is to 27 Amplification Noise Sound Cost 4 keep the ___________ within reasonable limit. The unit used in public address system to isolate 28 Microphone Mixer Process Ckt Power Amplifier 2 different channels from each Input is __________ The driver amplifier in the PAS is used to Amplifies the desired 29 Drive the Power Amplifier Amplifies the Mixer output None of these 1 ___________ power The outermost orbit in an atom is 30 earth Orbit Orbit Valence Orbit last Orbit 3 called____________ -19 Each Electron has a charge equal to 1.802 X 10 31 1.602 X 10-19 Coulomb 1.802 X 10-19 Coulomb 1.602 X 10-17 Coulomb 1 ____________coulombs Coulomb The maximum number of electrons in an orbit is 32 4n ² 2n ² 2n³ 4n³ 2 given by the relation ____________ The number of electrons in the 3rd orbit is 33 18 22 28 48 1 ____________ The number of electrons in the 4th orbit is 34 32 18 4 12 1 ____________ The number of protons or electrons in an atom is 35 Atomic energy Atomic mass Atomic weight Atomic number 4 known as ____________ The Atomic number is represented by the number neutrons or 36 Atoms or Electrons Electrons or Electrons Protons or Electrons 3 of ____________or ____________ in an atom Electrons  The Atomic mass in an atom is the total number neutrons or 37 Proton and Neutron Electrons or Electrons Protons or Electrons 1 of ____________and ____________ Electrons The total number of protons and neutrons in an Atomic Mass or Atomic Atomic energy or Atomic number or Atomic Atomic Mass or 38 1 atom is known as ____________ Weight Atomic Weight Weight Atomic number 39 The atomic number of silicon is ____________ 18 12 10 14 4 A power amplifier has 40 small large very large none of the above 1 comparatively_________beta The maximum collector efficiency of class B 41 50% 90% 60.50% 78.50% 4 operation is A 2-transistor class B power amplifier is 42 dual push pull symmetrical differential 2 commonly called ___________amplifier If a transistor is operated in such a way that 43 output current flows for 50% of the input class A class B class C none of the above 2 signal,then it is ___________operation If the zero signal power disipation of a transistors 44 is 1W,then power rating of the transistor should 0.5 W 0.33 W 0.75 W 1W 4 be atleast maximum voltage appears maximum voltage appears 45 When a transistor is cutoff_________ maximum current flows none of the above 1 across transistor across load In __________ amplifier the current at the 46 class A class B class C none of the above 1 output flows for the full input signal Class _________operation gives the maximum 47 A B C AB 3 distortion The output stage of a multistage amplifier usually 48 push pull amplifier preamplifier class A power amplifier none of the above 1 employes_________ DC forward voltage is needed to emit light in case 49 LED LCD Both LED & LCD Neither LED nor LCD 1 of Following is a digital circuit with one or more 50 Logic gate Rectifier Regulator none of these 1 inputs but only one output 51 Following are the basic gates AND ,OR,NOT AND,NAND,NOT NOR, NOT, OR all of these 1 52 NAND and NOR are ___ gates. Basic Universal Exclusive both (a) and (b) 2 53 Examples for Exclusive gates are NAND,NOR EX-OR,EX-NOR AND,NAND all of these 2 The Requirement of the PA system is Dynamic Range limitation& Reverberation & Acoustic feedback & phase 54 All of these. 4 ___________ &_________ Matching grounding delay 55 ILS stands for Instruction Landing System Instrument Landing Instruction Loading System Instrument Loading 2 ILS is used to when the visibility of the runway is 56 Good Poor clear at all times. 2 ________ 57 The abbreviated form of VRF __________ Vision radio frequency very high radio frequency Visual flight rules all of these 3 58 ILS system comprises of The localizer glide slope path marker beacons all of these 4 The atomic number of Germanium is 59 30 34 32 36 3 ____________ The silicon atom has 14 proton and 14 neutrons, 60 4 8 28 32 3 so it Atomic mass is ____________ The silicon atom has 14 proton and 14 neutrons, 61 28 1 4 14 4 so it Atomic number is ____________ The hydrogen atom has 1 proton and 1electron, 62 1 2 4 14 1 so it Atomic number is ____________ 63 The charges at rest is known as ____________ electric charges negative charges positive charges static charges 4 When an electron is removed or added in an atom 64 Nil charged uncharged charged discharged 3 the body gets ____________ If the electron is less than proton the in an atom 65 positive charge negative charge neutrally charged no charge 1 it become ____________ charged 66 The impurity atom donates electrons , is called carrier majority carrier donor none of these 3 If the electron is more than proton then the atom, 67 Negative charge positive charge neutrally charged no charge 1 is said to be ____________charged If the proton is less than electron then the atom 68 Neutral charge Nil charge Negative charge No charge 3 is said to be ____________ charged The size of a power transistor is made 69 provide easy handling dissipate heat facilitate connections none of the above 2 considerably large to Low efficiency of a power amplifier results in 70 low forward bias less battery consumption more battery consumption none of the above 3 ______________ 71 The amplifier used in pre amplifier stage Direct coupled RC couplec Transfomer Coupled none of the above 1 If the power rating of a transistor is 1W and 72 collector current is 100mA,then maximum 1V 100V 20V 10V 4 allowable collector voltage is 73 The conduction angle of class B amplifer is 360 degree 180 degree 180 degree 2  What will be the collector efficiency of a power 74 amplifier having input of 5 watts and a.c.power 20% 80% 40% 50% 3 output of 2 watts The output signal voltage and current of a power 75 amplifier are 5 V and 200 mA; the values being 1W 2W 4W none of the above 1 r.m.s.What is the power output? The output of a Full wave recitifier is 5V, then the 76 10V 20V 5V none of the above 1 diode PIV should be minimum of The Push- Pull circuit must used in 77 class A class C class B class AB 3 _____operation Using a single gate all other gates can be 78 Basic gates Logic gates Exclusive gates Universal gates 4 constructed is called? The output of a OR gate is LOW only when all of 79 HIGH infinity LOW all of these 3 its inputs are An OR gate has inputs A and B, then logical 80 A+B AB A-B A%B 1 expression for output Y= ___________ The output of an OR gate with 3 inputs, A, B, C is 81 A=1, B=1, C=0 A=0, B=0, C=1 A=1, B=1, C=1 all of the above 4 HIGH if when The output of an OR gate with 3 inputs, A, B, C is 82 A=1, B=1, C=0 A=0, B=0, C=0 A=1, B=1, C=1 A=1, B=0, C=1 2 LOW if when The localizer helps the Airplane to pass through 83 Centre line Marker Beacon 3 End none of these 1 the ___________of the runway. 84 The localizer operates in __________ frequency. 88 MHz - 108MHz 30MHz- 300 MHz 108MHz - 110MHz 300MHz -3GHz 3 The Glide Slope transmitter Ensures Aircraft Land on centre line of the speed 85 Correct angle of descent With visual flight rules 1 _____________ runway reduction. When a aircraft is landing ___________ ensures glide slope path 86 The localizer Marker beacons all of these 2 the aircraft has the correct angle of decent. equipment In ILS system glide path equipment operates in 87 339.3MHz-335MHz 339.3KHz-335KHz 339.3Hz-335KHz 39.3KHz-335MHz 1 the frequency range of The imaginary lines of force which exist in a 88 Force Flux Field Feet 2 electrostatic field are called ____________ According to columb’s 1st law like charges 89 Repel, attract attract, Repel Repel, Repel attract, attract 1 ____________ and unlike charges ____________ According to Columb’s 2nd law, the force of Product of the three Product of the two Product of the two Product of the two charges, attraction or repulsion between two charges is charges, Square of the charges, cube of the charges, and of the 90 Square of the distance 3 directly proportional to the ____________and distance between the distance between the distance between between the charges inversely proportional to ____________ charges charges the charges According to Cloumb’s 2nd law, the force of 91 F= k (q1q2/d2) F= 2k (q1q2/d2) F= 3k (q1q2/d2) F= 4k (q1q2/d2) 1 attraction or repulsion is ____________ If the distance between the two charges 92 decreases Remains same none of these increases 1 increases the force ____________ Difference in the electric pressure between the 93 electric difference charge difference potential difference pressure difference 3 two different charges is called ____________ 94 The unit of potential difference is Volts watt current capacitance 1 The force which moves the electrons in a 95 EEF FFM MMF EMF 4 conductor is known as ____________ 96 Unit of EMF is Watts Volts current capacitance 2 According to Ohms law the current through a conductor is directly proportional to 97 Conductance and Resistance current and Resistance Voltage and Resistance Voltage and current 3 ____________and inversely proportional to ____________ In __________ cirucuit two center tapped RC coupled 98 Centre tapped rectifier Bridge rectifier Push pull amplifier 3 transformers are used amplifier In case of Amplifiers which coupling give the 99 Direct coupled RC couplec Transfomer Coupled none of these 3 highest gain 100 In a Stepup transfomer ___________ N1>N2 N2>N1 N21 =