0% 0 Electrical Engineering Quiz 53 1 / 50 The selection of an electric motor for any application depends on which of the following factors ? All of the above Mechanical characteristics Size and rating of motors Electrical characteristics 2 / 50 In a lead-acid battery the energy is stored in the form of___________? chemical energy charged ions electromagnetic energy electrostatic energy 3 / 50 Electric pressure is also called________? resistance voltage power energy 4 / 50 capacitors can be used only for D.C ? Paper Electrolytic Air Mica 5 / 50 Which of the following cell has a. reversible chemical reaction ___________? Lead-acid Mercury oxide Silver-oxide Carbon-zinc 6 / 50 Negative feedback in an amplifier____________? Reduces gain Increases noise Reduces bandwidth Increase frequency &phase distortion 7 / 50 What is/are the configurable functions of each and every IOBs connected around the FPGA device from the operational point of view ? All of the above Input operation Tristate output operation Bi-directional I/O pin access 8 / 50 ____________are used for construction of core of electromagnets? None of the above All Hard magnetic materials Soft magnetic materials 9 / 50 Insulating materials have the function of______________? preventing a short circuit between conducting wires preventing an open circuit between the voltage source and the load storing very high currents conducting very large currents 10 / 50 A nuclear power plant is invariably used as a__________? peak load plant spinning reserve plant base load plant stand-by plant 11 / 50 The material commonly used for sheaths of underground cables is______________? rubber lead iron copper 12 / 50 In D.C. machines the number of slots per pole usually lies___________? between 2 to 4 between 20 to 30 between 6 to 8 between 9 to 16 13 / 50 Zero initial condition for a system means_______________? input reference signal is zero ne initial movement of moving parts zero stored energy system is at rest and no energy is stored in any of its components 14 / 50 A star circuit has element of resistance R/2. The equivalent delta elements will be_____________? R/6 4R 2R fi? 15 / 50 When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle? will depend on the radius of the circle will be infinite will be zero will depend on the amount of e.m.f. applied 16 / 50 Evaporative type of condenser has___________? steam in pipes surrounded by water water in pipes surrounded by steam All none of the above 17 / 50 Hysteresis loss least depends on____________? ambient temperature frequency steinmetz coefficient of material volume of material 18 / 50 Which of the following motors is preferred for tape-recorders ? Shaded pole motor Hysteresis motor Universal motor Two value capacitor motor 19 / 50 At transition temperature the value of critical field is____________? zero complex value negative real value positive real value 20 / 50 In a capacitor start single-phase motor, when capacitor is replaced by a resistance____________? the motor will consume less power motor will run in reverse direction torque will increase motor will continue to run in same direction 21 / 50 The superposition theorem requires as many circuits to be solved as there are____________? nodes sources, nodes and meshes sources and nodes sources 22 / 50 Thermal voltage VT can be given by____________? (K2/q)(T + 1/T ? 1) KT/q Kq/T qT/K 23 / 50 Which of the following has the highest value of thermal conductivity ? Melting ice Steam Water Sold ice 24 / 50 A synchronous motor develops maximum power when load angle is____________? 120? 90? 45? 60? 25 / 50 For starting a D.C. motor a starter is required because___________? none of the above it starts the motor it limits the speed of the motor it limits the starting current to a safe value 26 / 50 Which of the following are not repayable after a stipulated period? Fixed deposits Shares Bonds Cash certificates 27 / 50 A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of______________? 50KHz 1000/7.07KHz 1000/17KHz 100KHz 28 / 50 In a certain common-source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is_______________? 3.2 8.75 1 11.4 29 / 50 The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________? 6 2 4 8 30 / 50 Resistances can be measured with the help of_______________? wattmeters ammeters voltmeters ohmmeters and resistance bridges 31 / 50 Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will_______________? remain constant depends upon composition of dielectric increase decrease 32 / 50 When a 1.6 k? resistor and a 120? resistor are connected in parallel, the total resistance is____________? greater than 1.6 k? less than 120 but greater than 100 ? less than 100 ? greater than 120 but less than 1.6 k? 33 / 50 The disadvantage of base resistor method of transistor biasing is that it_________________? Is complicated Provides high stability None of the above Is sensitive to changes in ? 34 / 50 Which of the following statements regarding hysteresis motor is in incorrect? It is extremely quiet in operation It accelerates from rest to full-speed almost instantaneously Its high starting torque is due to its high rotor hysteresis loss It is extremely sensitive to fluctuations in supply voltage 35 / 50 The function of conservator in a transformer is___________________? to project against?internal fault to reduce copper as well as core losses to cool the transformer oil to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings 36 / 50 The point of intersection of d.c. and a.c. load lines represents __________________? Operating point None of the above Current gain Voltage gain 37 / 50 The square waveform of current has following relation between r.m.s. value and average value? r.m.s. value of current is less than average value none of the above r.m.s. value of current is greater than average value r.m.s. value is equal to average value 38 / 50 The property of a conductor due to which it passes current is called___________? inductance conductance reluctance resistance 39 / 50 If a square wave is fed to a differentiating circuit, the output will be _____________? Sine wave Triangular wave Sharp narrow pulses Rectangular wave 40 / 50 A no-load test is performed on a transformer to determine_______________? copper loss efficiency core loss magnetising current and loss 41 / 50 In a full wave rectifier, the rectification ratio is approximately equal to____________? 71% 91% 61% 81% 42 / 50 Under over voltage condition impedance offered by the voltage clamping device is__________? High low infinity moderate 43 / 50 When the load is above _______________ a synchronous motor is found to be more economical? 20 kW 2 kW 50 kW 100 kW 44 / 50 Heat control switches are used in__________________? cooling ranges transformers three phase induction motors single phase 45 / 50 A zener diode is________________ device? an amplifying a non-linear a linear none of the above 46 / 50 If firing angle in an SCR circuit is increased, the output _____________? Is decreased None of the above Remains the same Is increased 47 / 50 When the crystal current diode current is large, the bias is ______________? poor inverse reverse forward 48 / 50 is the property of absorbing moisture from atmosphere_____________? Hygroscopicity Porosity Viscosity Solubility 49 / 50 A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________? A torque about horizontal axis No resultant force An upward force along the axis A torque about vertical axis 50 / 50 SF6 gas______________? is lighter than air has pungent small is nontoxic is yellow in colour Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevElectrical Engineering Quiz 52 Electrical Engineering Quiz 54Next
