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? 120mA 12mA 1.2A 12A 2 / 50 What is the standard size of GI earth wire in domestic installation 8 SWG 12 SWG 14 SWG 10 SWG 3 / 50 For which motors DOL starter can be used Up to 5 H.P Up to 10 H.P Up to 20 H.P Up to 15 H.P 4 / 50 Moisture content in the soil earth soil resistance does not affect decrease none of the above increase 5 / 50 Differential relays use the principle of Time domain comparison Current magnitude comparison between incoming and outgoing feeder Frequency domain analysis 6 / 50 Fuse protection is used for current ratings up to 50A 10A 20A 100A 7 / 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 4 5 2 8 8 / 50 How much module box required for a single switch and socket 4m 1m 6m 3m 9 / 50 The speed of a synchronous motor none of the above always remain constant decreases as the load decreases increases as the load increases 10 / 50 Which of the following circuit element stores energy in the electromagnetic field resistance condenser variable resistor inductance 11 / 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 1200V 12000V 120V 12V 12 / 50 Permissible current density of GI .28A/mm2 48A/mm2 1.2A/mm2 118A/mm2 13 / 50 Laminated core in electrical machines are used to reduce copper loss eddy current loss hysteresis loss all of the above 14 / 50 Starters are used with D.C motors because These motors are not self-starting These motors have high starting torque To restrict armature current as there is no back emf while starting Back emf of these motors is initially zero 15 / 50 The frequency of domestic power supply in India is 50 Hz 200 Hz 60 Hz 100 Hz 16 / 50 Who typically performs Factory Acceptance Testing Developers End- users or stakeholders Project Managers Testers 17 / 50 Sag is independent of length of span tension in the conductor None of the above line voltage 18 / 50 Distribution lines in India generally use R.C.C poles Wooden poles None of the above Steel towers 19 / 50 Capacitors for power factor correction are rated in kVA kW kV kVAR 20 / 50 Size of wire required for a.c 2.5sqm 4sqm 1sqm 1.5sqm 21 / 50 Form factor for a sine wave is 0.707 1.11 1.414 0.637 22 / 50 The voltage of the single-phase supply to residential consumer is 210V 400V 230V 110V 23 / 50 The fuse rating is expressed in terms of voltage VAR kVA current 24 / 50 The operating voltage of extra high-tension cables is up to 66kV 6.6kV 33kV 11kV 25 / 50 A 3phase squirrel cage induction motor is started with star delta starter. What is the starting current of the motor 3 times the starting current with DOL 1/6 times the current with DOL 1/3 times the current with DOL None of the above 26 / 50 The filament of electric bulb is made of nickel tungsten aluminum carbon 27 / 50 What is QA it is the measurement of degree to which a product satisfies the need process of identifying defects any systematic process used to ensure quality in the process it is a corrective tool 28 / 50 For 66Kv lines the number of insulator disc are used 6 8 2 10 29 / 50 Sulphur hexafluoride is a conductor dielectric inactive gas semiconductor 30 / 50 H.R.C fuses provide best protection against overload reverse current open circuits short circuits 31 / 50 Which of the following does not change in an ordinary transformer Voltage all of the above Frequency Current 32 / 50 What is the insulation breakdown voltage of a cable 1100V 1000V 1200V 880V 33 / 50 Currently ISO 9001 is going through which revision cycle 2015 2000 2012 2014 34 / 50 A fuse is connected none of the above in parallel with the circuit either in series or parallel with the circuit in series with the circuit 35 / 50 The material commonly used for sheath of underground cables is Rubber Lead Copper Iron 36 / 50 Relation between phase voltage and line voltage in three phase delta connected system Vline= Vphase/1.73 Vline= Vphase Vline= 1.41Vphase Vline= 1.73Vphase 37 / 50 A series motor is best suited for driving cranes and hoists shear and punches none of the above machine tools 38 / 50 Which type of wiring system is suitable for multistorey building Tree system distribution board system looping out with junction box Ring main system 39 / 50 Transmission line insulators are made of porcelain iron glass P.V.C 40 / 50 Lamination of transformer core is made up of Aluminum Iron Silicon Steel Steel 41 / 50 Earth wire or ground wire is made up of Copper Al Galvanized steel Iron 42 / 50 The wooden poles well impregnated with creosote oil or any preservative compound have life 10 to 15 years 25 to 30 years 2 to 5 years 60 to 70 years 43 / 50 If the 4 bulbs having power ratings 5W,10W,25W,35W which one will have highest resistance 35W 5W 25W 10W 44 / 50 The operating voltage of high-tension cables is up to 66kV 6.6kV 11kV 33kV 45 / 50 A 3-phase 4-wire system is commonly used on Primary transmission Secondary transmission Primary distribution Secondary distribution 46 / 50 Transformer ratings are given in HP kVA KW kVAR 47 / 50 The chemical used in breather for transformer should have the quality of cleansing the transformer oil cooling the transformer oil absorbing moisture ionizing air 48 / 50 The algebraic sum of voltages around any closed path in a network is equal to negative polarity 1 infinity 0 49 / 50 Power factor of the following circuit will be unity resistance capacitance both (a) and (b) inductance 50 / 50 What will happen if DC motor is used without starter Heavy sparking at brushes Will not start at all Depends on load It will start smoothly Your score isThe average score is 55% 0% Restart quiz
