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