STED COUNCIL ELECTRICAL QA\QC 2022 SCHEME 0% STED COUNCIL (QA/QC) Online Exam Your NameEmail-idPhone Number 1 / 50 1) How much current is produced by a voltage of 18kV across a 15-kilo ohm resistance? 120mA 12A 1.2A 12mA 2 / 50 2) Factors on which soil resistance depends depth of electrode moisture salt all of the above 3 / 50 3) Differential relays use the principle of Time domain comparison Current magnitude comparison between incoming and outgoing feeder Frequency domain analysis 4 / 50 4) Fuse protection is used for current ratings up to 100A 50A 20A 10A 5 / 50 5) The frequency of domestic power supply in India is 200 Hz 60 Hz 50 Hz 100 Hz 6 / 50 6) The chemical used in breather for transformer should have the quality of cooling the transformer oil ionizing air cleansing the transformer oil absorbing moisture 7 / 50 7) Form factor for a sine wave is 0.707 1.414 1.11 0.637 8 / 50 8) Which type of wiring system is suitable for multistorey building Ring main system distribution board system looping out with junction box Tree system 9 / 50 9) The fuse rating is expressed in terms of current VAR voltage kVA 10 / 50 10) The primary winding of a transformer has a 120V ac supply. What is the value of secondary voltage if the turns ratio is 10 12V 12000V 120V 1200V 11 / 50 11) A 3-phase 4-wire system is commonly used on Primary distribution Secondary distribution Primary transmission Secondary transmission 12 / 50 12) Starters are used with D.C motors because To restrict armature current as there is no back emf while starting Back emf of these motors is initially zero These motors are not self-starting These motors have high starting torque test wrong answer test right answer 13 / 50 13) For 66Kv lines the number of insulator disc are used 6 2 8 10 14 / 50 14) Moisture content in the soil _______ earth soil resistance increase none of the above decrease does not affect 15 / 50 15) Which of the following circuit element stores energy in the electromagnetic field inductance resistance condenser variable resistor 16 / 50 16) Permissible current density of GI These motors are not self-starting To restrict armature current as there is no back emf while starting These motors have high starting torque Back emf of these motors is initially zero test wrong answer test right answer 17 / 50 17) The algebraic sum of voltages around any closed path in a network is equal to 0 1 infinity negative polarity 18 / 50 18) H.R.C fuses provide best protection against short circuits reverse current overload open circuits 19 / 50 19) The medium employed for extinction of arc in air circuit breaker is SF6 vacuum air oil 20 / 50 20) Relation between phase voltage and line voltage in three phase delta connected system Vline= Vphase Vline= Vphase/1.73 Vline= 1.41Vphase Vline= 1.73Vphase test wrong answer test right answer 21 / 50 21) Pin type insulators are not used for voltages beyond 33kV 22kV 1kV 11kV 22 / 50 22) The conductors of the overhead lines are Solid None of the above Both (a) and (b) Stranded 23 / 50 23) The insulating material of a cable should have high dielectric strength all of the above low-cost high mechanical strength 24 / 50 24) The voltage of the single-phase supply to residential consumer is 110V 230V 400V 210V 25 / 50 25) A fuse is connected in series with the circuit none of the above in parallel with the circuit either in series or parallel with the circuit 26 / 50 26) Distribution lines in India generally use R.C.C poles None of the above Steel towers Wooden poles 27 / 50 27) 3-point starter is used to start the compound motor shunt motor series motor Both (b) and (c) 28 / 50 28) For which motors DOL starter can be used Up to 20 H.P Up to 10 H.P Up to 5 H.P Up to 15 H.P 29 / 50 29) The filament of electric bulb is made of nickel carbon aluminum tungsten 30 / 50 30) Capacitors for power factor correction are rated in kV kW kVA kVAR 31 / 50 31) In a cable immediately above, metallic sheath _______ is provided none of the above earthing connection armouring bedding 32 / 50 32) The operating voltage of high-tension cables is up to 33kV 11kV 6.6kV 66kV 33 / 50 33) The speed of a synchronous motor none of the above increases as the load increases always remain constant decreases as the load decreases 34 / 50 34) Laminated core in electrical machines are used to reduce hysteresis loss all of the above eddy current loss copper loss 35 / 50 35) What is the insulation breakdown voltage of a cable 1200V 1100V 1000V 880V 36 / 50 36) Transformer ratings are given in KW kVAR kVA HP 37 / 50 37) The operating voltage of extra high-tension cables is up to 6.6kV 33kV 11kV 66kV 38 / 50 38) Transmission line insulators are made of porcelain P.V.C glass iron 39 / 50 39) In an induction motor, rotor slots are usually not quite parallel to the shaft but are given a slight skew To reduce the magnetic hum To reduce the locking tendency of the rotor Both (a) and (b) To increase the speed of the rotor 40 / 50 40) Breaking capacity of a circuit breaker is usually expressed in terms of amperes MW volts MVA 41 / 50 41) Which of the following does not change in an ordinary transformer Voltage Frequency all of the above Current 42 / 50 42) What will happen if DC motor is used without starter It will start smoothly Heavy sparking at brushes Depends on load Will not start at all 43 / 50 43) The material commonly used for sheath of underground cables is Lead Copper Rubber Iron 44 / 50 44) Overhead system can be designed for operation up to 66kV 33kV 11kV 400kV 45 / 50 45) Power factor of the following circuit will be unity capacitance inductance both (a) and (b) resistance 46 / 50 46) What is the standard size of GI earth wire in domestic installation 10 SWG 12 SWG 8 SWG 14 SWG 47 / 50 47) A series motor is best suited for driving none of the above machine tools shear and punches cranes and hoists 48 / 50 48) The field coils of D.C generator are made of copper cast iron carbon mica 49 / 50 49) In which of the following motors the stator and rotor magnetic field rotate at the same speed synchronous motor universal motor reluctance motor induction motor 50 / 50 50) Sulphur hexafluoride is a conductor semiconductor inactive gas dielectric Your score is 0%
