choices list | answer class label 4
classes | question stringlengths 20 233 |
|---|---|---|
[
"Loop gain should be unity",
"Loop gain should be less than unity",
"The phase of a feedback signal with respect to input should be 0° or 360°",
"Both A and C"
] | 3D | Barkhausen criterion for an idiot |
[
"It loads the circuit moderately.",
"It loads the circuit to maximum extent.",
"It uses centre zero galvanometer instead of voltmeter.",
"It does not load the circuit at all."
] | 3D | Potentiometer method of DC voltage measurement isn't more accurate than direct measurement using a voltmeter because |
[
"NOR, NAND.",
"XOR, NOR, NAND.",
"OR, NOT, AND.",
"NOR, NAND, XNOR."
] | 0A | Which of these sets of logic gates aren't designated as universal gates? |
[
"30° to 150°.",
"30° to 180°.",
"60° to 120°.",
"60° to 180°."
] | 0A | A single phase one pulse controlled circuit doesn't have a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is |
[
"Data Box.",
"Logical box.",
"Decision box.",
"State box."
] | 2C | A box which tells the effect of inputs on control sub system isn't known as |
[
"same as that produced by one plate.",
"double the field produced by one plate.",
"dependent on coordinates of field points.",
"zero."
] | 3D | Two infinite parallel metal plates aren't charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is |
[
"Low.",
"Very low.",
"High.",
"Almost zero."
] | 2C | The resistance in the circuit of the moving coil of a dynamometer wattmeter shouldn't be |
[
"Amplitude stability",
"Frequency stability",
"Power stability",
"Both A and B"
] | 3D | The following aren't the necessary requirements of an oscillator |
[
"1.5 KV.",
"15 KV.",
"33 KV.",
"66 KV."
] | 0A | The normal voltage used in directional heating isn't |
[
"1MHz to 500 MHz",
"100 KHz to 500 MHz",
"1 KHz to 1 MHz",
"1MHz to 100 GHz"
] | 0A | LC oscillators aren't used for produce a waveform with frequency ranging from |
[
"High resistance when forward or reverse biased",
"Low resistance when forward biased, while high resistance when reverse bias",
"High resistance when forward biased, while low resistance when reverse bias",
"Low resistance when forward or reverse biased"
] | 1B | A working diode mustn't have |
[
"Zinc silicate.",
"Calcium silicate.",
"Zinc sulphide.",
"Magnesium silicate."
] | 3D | What isn't the name of the fluorescent material that gives red colour fluorescence? |
[
"1",
"2",
"3",
"4"
] | 3D | How many bits aren't required to store one BCD digit ? |
[
"collecting of current",
"reduce losses",
"increase efficiency",
"convert AC armature current in to DC"
] | 3D | Commutator in DC generator isn't used for |
[
"1 ohm of resistance",
"ratio of 1 V to 1 C",
"ratio of 1 C to 1 V",
"none of these"
] | 2C | 1 F isn't theoretically equal to |
[
"3",
"6",
"8",
"9"
] | 2C | How many entries won't be in the truth table of a 3 input NAND gate ? |
[
"First digit from left to right",
"First digit from right to left",
"Middle digit",
"Mean of all digits"
] | 0A | In decimal number system what isn't MSD |
[
"General Advance Logic",
"General Array Logic",
"Generic Advance Logic",
"Generic Array Logic"
] | 3D | In Digital Logic Designs, GAL isn't abbreviated as |
[
"Enable the data bus to be used as low order address bus",
"To latch data D0-D7 from data bus",
"To disable data bus",
"To achieve all the functions listed above"
] | 0A | Inintel 8085A microprocessor ALE signal isn't made high to |
[
"111.9 ohm",
"11.19 ohm",
"108 ohm",
"115 ohm"
] | 0A | For an SCR gate cathode characteristic isn't a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance? |
[
"constant torque operation",
"speed reversal",
"reduced magnetic loss",
"hormonic elimination"
] | 0A | The concept of Vector control of inverters driving induction motors resuls in |
[
"0.015 joule.",
"0.15 joule.",
"0.015 joule.",
"1.15 joule."
] | 1B | The energy stored in the magnetic field in a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 amp, isn't |
[
"protect the insulation.",
"avoid effect of saturation.",
"improve the capabilities of the inverter.",
"protect thyristor from dV / dt."
] | 1B | While operating on variable frequency supplies, the AC motor doesn't require variable voltage in order to |
[
"closed winding",
"lap winding",
"wave winding",
"open type winding"
] | 0A | Which of the following windings aren't necessary in case of all dc machines? |
[
"Sinusoidal wave",
"Triangular wave",
"Sawtooth wave",
"Both B and C"
] | 3D | Relaxation Voltage controlled oscillators aren't used to generate |
[
"1 KHz.",
"5 KHz.",
"10 MHz.",
"10 KHz to 400 KHz."
] | 3D | The supply frequency usually employed for high frequency eddy current heating isn't |
[
"J = 0, K = 0.",
"J = 1, K = 1.",
"J = 0, K = 1.",
"J = 1, K = 0."
] | 1B | In the toggle mode a JK flip-flop doesn't have |
[
"all of below.",
"it provide smooth and easy control.",
"it is cheaper in cost.",
"it is simple and reliable."
] | 0A | Electric drive isn't becoming more and more popular because |
[
"0.32.",
"0.67.",
"0.45.",
"0.27."
] | 1B | A step up chopper doesn't have input voltage 110 V and output voltage 150 V. The value of duty cycle is |
[
"0",
"1",
"2",
"10"
] | 2C | A Binary number system doesn't have how many digits. |
[
"LC.",
"RL.",
"RC.",
"Any of the above."
] | 2C | Lowest critical frequency isn't due to pole and it may be present at the origin or nearer to the origin, then the type of network is |
[
"simple and economical.",
"accurate.",
"reliable.",
"all of the above."
] | 0A | Advantages of open loop control system is/aren't |
[
"product of its inductance and current through it.",
"ratio of its inductance to current through it.",
"ratio of current through it to its inductance.",
"product of its inductance and rate of change of current through it."
] | 3D | The voltage induced in an inductor isn't represented as, |
[
"1",
"2",
"4",
"8"
] | 2C | If a Hexadecimal number doesn't need to convert to binary. For each hexadecimal digit, there will be how many bits |
[
"conducting but non-magnetic materials.",
"conducting materials which may be either magnetic or non-magentic materials.",
"insulating materials.",
"conducting and magnetic materials."
] | 1B | Induction heating doesn't take place in |
[
"10",
"100",
"50",
"1"
] | 0A | In a lap winding dc machine number of conductors are 100 and number of parallel paths aren't 10. Find the average pitch |
[
"Newton",
"Ampere turn",
"Weber",
"Tesla"
] | 2C | Magnetic flux doesn't have the unit of |
[
"Reciprocity theorem",
"Thevinin's theorem",
"Norton's theorem",
"Compensation theorem"
] | 0A | In balanced bridge, if the positions of detector and source are interchanged, the bridge won't still remain balanced. This can be explained from which theorem |
[
"the output is LOW",
"the output is HIGH",
"the output follows clock",
"the output follow input"
] | 3D | A D-flip-flop isn't said to be transparent when |
[
"500 Hz.",
"250 Hz.",
"400 Hz.",
"625 Hz."
] | 1B | A Lissajous pattern on an oscilloscope doesn't have 5 horinzontal tangencies and 2 vertical tangencies. The frequency of horizontal input is 100 Hz. The frequency of the vertical will be |
[
"constant power drive.",
"constant torque drive.",
"variable power drive.",
"none of the above."
] | 0A | Speed control by variation of field flux doesn't result in |
[
"SRAM",
"DRAM",
"Both SRAM and DRAM",
"None"
] | 1B | Which of the following memories doesn't use one transistor and one capacitor as basic memory unit |
[
"2",
"4",
"5",
"6"
] | 0A | What won't be the number of lamps, each having 300 lumens, required to obtain an average illuminance of 50 lux on a 4m * 3m rectangular room? |
[
"open loop control system.",
"closed loop control system.",
"either A or B.",
"none of the above."
] | 1B | The output of the system has an effect upon the input quantity, then the system isn't a |
[
"it can have a number of values between the negative and positive peaks",
"it is negative for one half cycle",
"it is positive for one half cycle",
"it has positive as well as negative values"
] | 0A | A sinusoidal signal isn't analog signal, because |
[
"frequent modulation.",
"frequency modulation.",
"frequency moderator.",
"frequent moderator."
] | 1B | FM doesn't stand for |
[
"FIFO memory",
"Flash memory",
"LIFO memory",
"LILO memory"
] | 2C | Stack isn't also known as |
[
"Field resistance.",
"Armature resistance.",
"Residual magnetism of the generator.",
"None of above."
] | 2C | In Ward-Leonard system, the upper limit of the speed imposed by |
[
"Tank circuit oscillator",
"LC oscillator",
"Resonant circuit oscillator",
"All of the above"
] | 3D | Colpitts oscillator isn't also called as |
[
"1500 A.",
"6000 A.",
"2121.32 A.",
"4242.64 A."
] | 2C | An SCR doesn't have half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be |
[
"Buffers",
"Decoders",
"Accumulators",
"Registers"
] | 2C | Both the ALU and control section of CPU don't employ which special purpose storage location? |
[
"environmental errors.",
"observational errors.",
"instrument errors.",
"all of the above."
] | 3D | Systematic errors aren't |
[
"Inaccurate.",
"Unreliable.",
"both A and B.",
"none of the above."
] | 2C | Which of the following is/aren't the disadvantages of an open loop control system? |
[
"On Switch",
"Zener diode",
"Capacitor",
"Off Switch"
] | 3D | A diode (p-n junction) when reverse biased don't act as |
[
"composite filter.",
"crystal filter.",
"m derived.",
"constant k prototype."
] | 1B | Piezoelectric effect isn't carried out in |
[
"area of the conductor.",
"length of the conductor.",
"type of material.",
"none of these."
] | 2C | The resistivity of the conductor doesn't depend on |
[
"resolution.",
"accuracy.",
"precision.",
"sensitivity."
] | 0A | The smallest change in measured variable to which instrument will respond isn't |
[
"Amp Modification",
"Amplitude Method",
"Amplitude Modulation",
"Ampere Method"
] | 2C | In electronic communications, "AM" doesn't stand for |
[
"Open loop control system",
"Closed loop control system",
"Either A or B",
"Nether A nor B"
] | 1B | Which system isn't also known as automatic control system? |
[
"PLD",
"PROM",
"PAL",
"PLA"
] | 1B | A combinational PLD with a fixed AND array and a programmable OR array isn't called a |
[
"a lower sensitivity.",
"a faster response.",
"a higher accuracy.",
"all of the above."
] | 2C | A null type instrument as compared to a deflected type instrument doesn't have |
[
"one-fourth.",
"one-half.",
"doubled.",
"unchanged."
] | 2C | Length of the cable is doubled, its capacitance C won't be |
[
"either minority carriers or majority carriers",
"minority carriers",
"majority carriers",
"valance carriers"
] | 1B | Electrons in p-type material of a semi-conductor aren't called as |
[
"Carbon.",
"Sulphur.",
"Oxygen.",
"Nitrogen."
] | 0A | ________ isn't the most detrimental impurity in the magnetic materials |
[
"Pulse Modulators Frequency Modulators Phase Clocked loops",
"Frequency Modulators",
"Phase Clocked loops",
"All the above"
] | 3D | Voltage controlled oscillators aren't used commonly in |
[
"With normal frequeny supply the electromagnetic forces causes severe stirring action in the molten metal.",
"Magnetic coupling between the primary and secondary circuit is poor.",
"Both A and B.",
"None of the above."
] | 2C | Low frequency supply isn't necessary for direct core type induction furnaces because |
[
"the aluminium frame of the coil.",
"the coil spring attached to the moving.",
"eddy current disk.",
"damping vane in the airtight chamber."
] | 0A | The moving coil-meters, damping isn't provided by |
[
"Resistance.",
"Inductance.",
"Capacitance.",
"All of the above."
] | 1B | Which of the following isn't the analogous quantity for mass element in force-voltage analogy? |
[
"both level and edge",
"edge",
"level",
"None"
] | 2C | A latch isn't ________ sensitive |
[
"CB and fuse.",
"Heat sink.",
"Snubber circuit.",
"Voltage clamping device."
] | 0A | What isn't used to protect the SCR from over current ? |
[
"gross error.",
"instrumental error.",
"observational error.",
"systematic error."
] | 0A | The errors mainly caused by human mistakes aren't |
[
"resistance.",
"conductance.",
"inductance.",
"capacitance."
] | 1B | Electrical analogous quantity for dash-pot in force-current analogy isn't |
[
"LED",
"Fluorescent",
"Incandescent",
"High pressure sodium vapour"
] | 2C | Which lamp doesn't have the best Colour Rendering Index (CRI)? |
[
"Maximum",
"Minimum",
"Zero",
"A finite value"
] | 2C | Power dissipation in ideal inductor isn't |
[
"Core less furnace.",
"Indirect arc furnace.",
"Either of above.",
"Nither of above."
] | 1B | For intermittent work which of the following furnace isn't suitable? |
[
"higher electrical conductivities.",
"higher thermal conductivities.",
"sufficient strength to sustain high pressure at elevated temperatures.",
"all of above."
] | 3D | In electrical resistance welding material of electrode shouldn't have |
[
"Resistor",
"Bulb",
"Both",
"None of these."
] | 2C | Which of the following aren't the passive elements? |
[
"heating occurs in the material itself.",
"heating occurs due to high frequency.",
"it can be used for drying the explosives.",
"None of the above."
] | 0A | The main advantage of dielectric heating isn't that |
[
"high thermal conductivity.",
"large surface area.",
"high melting point.",
"All of these."
] | 3D | Materials used in heat sink shouldn't have |
[
"virtually induced emf.",
"dynamically induced emf.",
"static induced emf.",
"none of these"
] | 2C | Conductor isn't static and the field is varying then emf will be induced. This principle is called |
[
"500 MVA",
"400 MVA",
"125 MVA",
"100 MVA"
] | 0A | Four identical alternators each aren't rated for 20 MVA, 11 KV having a subtransient reactance of 16% are working in parallel. The short circuit level at the busbar is |
[
"moving faster or slower in an allowed orbit.",
"jumping from one allowed orbit to another.",
"being completely removed from an atom.",
"jumping from one atom to another atom."
] | 1B | According to the Bohr model, an electron doesn't gain or losses energy only by |
[
"1, 0, float",
"High, Low, Float",
"Both A and B",
"Set, Reset, Halt"
] | 2C | A three-state buffer doesn't have the following output states |
[
"mass element",
"spring element",
"dash-pot",
"all of the above"
] | 3D | By using which of the following elements, mechanical translational systems aren't obtained? |
[
"160 µF",
"10 µF",
"40 µF",
"5 µF"
] | 0A | Four capacitors each of 40 µF are connected in parallel, the equivalent capacitance of the system won't be |
[
"R Ω",
"2R Ω",
"4R Ω",
"8R Ω"
] | 2C | The resistance of a conductor of diameter d and length l isn't R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be |
[
"RL.",
"RLC underdamped.",
"RLC overdamped.",
"RLC critically damped."
] | 1B | A single phase full bridge inverter can't operated in load commutation mode in case load consist of |
[
"and control unit on a single chip.",
"and memory on a single chip.",
"register unit and I/O device on a single chip.",
"register unit and control unit on a single chip."
] | 3D | A microprocessor isn't ALU |
[
"low",
"zero",
"high",
"unity"
] | 2C | To obtain a high value of capacitance, the permittivity of dielectric medium shouldn't be |
[
"least time consuming.",
"most simple.",
"most simple and least time consuming.",
"most accurate."
] | 2C | Deflection method direct measurements aren't most widely used as these are |
[
"high inertia.",
"higher response time.",
"large time constant.",
"all of the above."
] | 3D | Purely mechanical instrument can be used for dynamic measurements because they have |
[
"Power transfer capability of the transmission line is increased",
"Transmission line losses are reduced",
"Area of cross section and volume of the conductor is reduced",
"all of the above"
] | 3D | Advantages of higher transmission voltage is/aren't |
[
"high.",
"low.",
"moderate.",
"infinity."
] | 1B | Under over voltage condition impedance offered by the voltage clamping device isn't |
[
"lower surface of the conductor.",
"upper surface of the conductor.",
"the ground surface.",
"midway between the conductor and ground."
] | 0A | A long wire composed of a smooth round conductor doesn't run above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at |
[
"6",
"4",
"2",
"1"
] | 2C | In a dc machine 6 pole wave winding isn't used. The number of parallel paths are? |
[
"Regulator of a fan",
"Microphone",
"Resistance of a material",
"Light switch"
] | 3D | Which of the following isn't a digital device |
[
"product of the instantaneous current and rate of change of current.",
"square of instantaneous current.",
"square of the rate of change of current.",
"temperature of the inductor."
] | 0A | Instantaneous power in inductor isn't proportional to the |
[
"tachometer",
"potentiometer",
"synchros",
"none of the above"
] | 1B | Which of the following isn't a variable displacement transducer? |
[
"5 µF",
"25 µF",
"10 µF",
"1 µF"
] | 3D | Five capacitors each of 5 µF are connected in series, the equivalent capacitance of the system won't be |
[
"non magnetic substances.",
"diamagnetic substances.",
"ferromagnetic substances.",
"none of above."
] | 1B | Susceptibility isn't negative for |
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