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