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