STED COUNCIL ELECTRICAL QA\QC 2022 SCHEME STED COUNCIL (QA/QC) Online Exam 1 / 50 The voltage of the single-phase supply to residential consumer is 210V 110V 230V 400V 2 / 50 Moisture content in the soil earth soil resistance decrease increase none of the above does not affect 3 / 50 What is the standard size of GI earth wire in domestic installation 10 SWG 8 SWG 12 SWG 14 SWG 4 / 50 Fuse protection is used for current ratings up to 20A 50A 100A 10A 5 / 50 Currently ISO 9001 is going through which revision cycle 2000 2012 2015 2014 6 / 50 Lamination of transformer core is made up of Aluminum Iron Steel Silicon Steel 7 / 50 The frequency of domestic power supply in India is 100 Hz 200 Hz 60 Hz 50 Hz 8 / 50 Sulphur hexafluoride is a conductor inactive gas dielectric semiconductor 9 / 50 A fuse is connected none of the above in parallel with the circuit in series with the circuit either in series or parallel with the circuit 10 / 50 For 66Kv lines the number of insulator disc are used 10 8 2 6 11 / 50 A 3phase squirrel cage induction motor is started with star delta starter. What is the starting current of the motor 1/6 times the current with DOL 3 times the starting current with DOL 1/3 times the current with DOL None of the above 12 / 50 Differential relays use the principle of Current magnitude comparison between incoming and outgoing feeder Frequency domain analysis Time domain comparison 13 / 50 Who typically performs Factory Acceptance Testing Project Managers End- users or stakeholders Testers Developers 14 / 50 The speed of a synchronous motor increases as the load increases decreases as the load decreases always remain constant none of the above 15 / 50 Power factor of the following circuit will be unity resistance capacitance inductance both (a) and (b) 16 / 50 Transmission line insulators are made of iron P.V.C porcelain glass 17 / 50 A 3-phase 4-wire system is commonly used on Primary distribution Secondary transmission Secondary distribution Primary transmission 18 / 50 The primary winding of a transformer has a 120V ac supply. What is the value of secondary voltage if the turns ratio is 10 120V 12000V 1200V 12V 19 / 50 The wooden poles well impregnated with creosote oil or any preservative compound have life 25 to 30 years 10 to 15 years 2 to 5 years 60 to 70 years 20 / 50 Which type of wiring system is suitable for multistorey building Tree system looping out with junction box distribution board system Ring main system 21 / 50 The operating voltage of high-tension cables is up to 6.6kV 66kV 11kV 33kV 22 / 50 Permissible current density of GI .28A/mm2 1.2A/mm2 118A/mm2 48A/mm2 23 / 50 The filament of electric bulb is made of tungsten carbon nickel aluminum 24 / 50 A 3-phase induction motor runs at 1500rpm at no load and 750rpm at full load when connected to 60Hz 3 phase line. Calculate the number of poles the motor has 2 5 4 8 25 / 50 The chemical used in breather for transformer should have the quality of cleansing the transformer oil ionizing air absorbing moisture cooling the transformer oil 26 / 50 Sag is independent of line voltage None of the above tension in the conductor length of span 27 / 50 Size of wire required for a.c 1sqm 1.5sqm 4sqm 2.5sqm 28 / 50 Which of the following does not change in an ordinary transformer Frequency Voltage Current all of the above 29 / 50 What is QA any systematic process used to ensure quality in the process process of identifying defects it is a corrective tool it is the measurement of degree to which a product satisfies the need 30 / 50 H.R.C fuses provide best protection against short circuits reverse current overload open circuits 31 / 50 What is the insulation breakdown voltage of a cable 1000V 1200V 1100V 880V 32 / 50 The fuse rating is expressed in terms of current voltage VAR kVA 33 / 50 Which of the following circuit element stores energy in the electromagnetic field condenser variable resistor resistance inductance 34 / 50 Relation between phase voltage and line voltage in three phase delta connected system Vline= 1.41Vphase Vline= Vphase Vline= Vphase/1.73 Vline= 1.73Vphase 35 / 50 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 have high starting torque These motors are not self-starting 36 / 50 What will happen if DC motor is used without starter Heavy sparking at brushes It will start smoothly Will not start at all Depends on load 37 / 50 Distribution lines in India generally use None of the above Steel towers R.C.C poles Wooden poles 38 / 50 The material commonly used for sheath of underground cables is Iron Lead Copper Rubber 39 / 50 Capacitors for power factor correction are rated in kVAR kW kV kVA 40 / 50 Transformer ratings are given in kVA HP KW kVAR 41 / 50 For which motors DOL starter can be used Up to 15 H.P Up to 20 H.P Up to 5 H.P Up to 10 H.P 42 / 50 Laminated core in electrical machines are used to reduce hysteresis loss copper loss all of the above eddy current loss 43 / 50 Form factor for a sine wave is 0.637 1.11 1.414 0.707 44 / 50 If the 4 bulbs having power ratings 5W,10W,25W,35W which one will have highest resistance 10W 25W 5W 35W 45 / 50 The algebraic sum of voltages around any closed path in a network is equal to 0 infinity 1 negative polarity 46 / 50 How much current is produced by a voltage of 18kV across a 15-kilo ohm resistance? 12A 12mA 1.2A 120mA 47 / 50 A series motor is best suited for driving none of the above machine tools shear and punches cranes and hoists 48 / 50 How much module box required for a single switch and socket 3m 4m 6m 1m 49 / 50 The operating voltage of extra high-tension cables is up to 6.6kV 11kV 66kV 33kV 50 / 50 Earth wire or ground wire is made up of Al Galvanized steel Iron Copper Your score isThe average score is 66% 0% Restart quiz
