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