Objective Questions on DC Motor for Electrician Trade
| Sr. No. | Questions with options |
| 1 | Which instrument is used to measure armature winding resistance?
(a) Megger (b) Multi meter (c) Series type ohm meter (d) Kelvin bridge Ans –(d) |
| 2 | Which instrument is used to test armature of winding for short and open circuit?
(a) Tong tester (b) Internal growler (c) External growler (d) Digital multi meter Ans- (c) |
| 3 | Which winding wire is used for DC field coil?
(a) Super enameled copper wire (b) Single silk covered wire (c) Double silk covered copper wire (d) PVC covered copper winding wire Ans-(a) |
| 4 | How many parallel paths in duplex lap winding in the armature of 4 pole DC Motor?
(a) 2 (b) 4 (c) 6 (d) 8 Ans _- (a) |
| 5 | Which rule determines the direction of rotation of armature in D.C motor?
(a) Right hand grip rule (b) Right hand palm rule (c) Fleming’s left hand rule (d) Fleming’s right hand rule Ans –(c) |
| 6 | Which rule determines the direction of current in D.C motor?
(a) Right hand grip rule (b) Right hand palm rule (c) Fleming’s left hand rule (d) Fleming’s right hand rule Ans –(d) |
| 7 | What is the name of winding, if coil pitch is less than pole pitch?
(a) Full pitch winding (b) Half pitch winding (c) Long chorded winding (d) Short chorded winding Ans – (d) |
| 8 | What is the purpose of series resistor connected with holding coil in a D.C four point starter?
(a) Limit the current in holding coil (b) Increase the current in holding coil (c) Increase the voltage in holding coil (d) Decrease the voltage in holding coil Ans – (a) |
| 9 | Which speed control method of D.C series motor is used for electric train?
(a) Field diverter method (b) Field tapping method (c) Armature diverter method (d) Supply voltage control method Ans – (a) |
| 10 | Why shunt field coil is connected in series with holding coil in D.C three point starter?
(a) Increase the holding coil current (b) Decrease the holding coil current (c) Protect the shunt field from over current (d) Protect the motor in case of open in shunt field Ans – (d) |
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| 11 | Why the direction of rotation is changed only by changing the armature current direction in a D.C compound motor?
(a) Maintain rated speed (b) Maintain motor characteristics (c) Avoid armature reaction effect (d) Prevent motor from over loading Ans – (b) |
| 12 | Which speed control methods offers below normal speed in D.C shunt motor?
(a) Field control method (b) Voltage control method (c) Armature control method (d) Ward leonard system of speed control Ans – (c) |
| 13 | Why starters are required to start D.C motors in industries?
(a) Regulate the field voltage (b) Reduce the armature current (c) Control the armature reaction (d) Smooth operation of motors Ans – (b) |
| 14 | Which insulating material belongs to Class ‘B’ insulation?
(a) Cotton (b) Bamboo (c) Fiber glass (d) Leatheroid paper Ans –(c) |
| 15 | Which type of D.C motor is used for constant speed drives?
(a) DC series motor (b) DC shunt motor (c) Differential long shunt compound motor (d) Differential short shunt compound motor Ans – (b) |
| Data Collected By – Rashmi | |
| Published On – 30th May 2022 | |
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