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Which instrument is used to measure armature winding resistance? S3M2-57
Which instrument is used to test armature winding for short and open circuit? S3M2-58
What is the name of the speed control method of DC motor? S3M2-59
Which winding wire is used for DC field coil? S3M2-60
Which formula is used to calculate the speed of DC motor? S3M2-61
How many parallel paths in duplex lap winding in the armature of 4 pole D.C Motor? S3M2-62
Which rule determines the direction of rotation of armature in D.C motor? S3M2-63
What is the name of D.C motor? S3M2-64
Which rule determines the direction of current in D.C motor? S3M2-65
What is the formula to calculate the current taken by D.C shunt motor armature? S3M2-66
Which rule is applied to identify the direction of flux in DC motor? S3M2-67
Name the type of DC motor. S3M2-68
What is the formula to calculate back EMF in a DC motor? S3M2-69
What is the name of the equipment? S3M2-70
What is the name of winding, if coil pitch is less than pole pitch? S3M2-71
What is the purpose of series resistor connected with holding coil in a D.C four point starter? S3M2-72
Which speed control method of D.C series motor is used for electric train? S3M2-73
Why shunt field coil is connected in series with holding coil in D.C three point starter? S3M2-74
Why the direction of rotation is changed only by changing the armature current direction in a D.C compound motor? S3M2-75
Which speed control methods offers below normal speed in DC shunt motor? S3M2-76
Why starters are required to start D.C motors in industries? S3M2-77
Which insulating material belongs to class ‘B’ insulation? S3M2-78
What is the temperature value of class ‘F’ insulation? S3M2-79
Which type of D.C motor is used for constant speed drives? S3M2-80
Which type of DC motor is used in elevators? S3M2-81
Which method of speed control gives below the rated speed in DC series motor? S3M2-82
What is the effect, if a four point starter resistance is cutoff during running? S3M2-83
Why carbon composition brush requires in the armature circuit to operate the D.C motor? S3M2-84
Why series motor produce high torque and speed initially without load? S3M2-85
Why the series field is short circuited at the time of starting in differential compound motor? S3M2-86
Which is the most effective method of balancing armature? S3M2-87
Which material is used for starting resistance of DC starters? S3M2-88
Which DC compound motor is operated at constant speed under varying load? S3M2-89
How No volt coil is connected in a three point starter with DC shunt motor? S3M2-90
Which type of armature winding is illustrated? S3M2-91
Which growler test for armature is illustrated? S3M2-92
Which speed control method is applied to obtain both below normal and above normal speed in DC motor? S3M2-93
Why commutators are sparking heavily? S3M2-94
What is the action of the induced emf in a running D.C motor? S3M2-95
Which motor has this characteristics curve? S3M2-96
What is the purpose of resistor connected with holding coil in 4 point starter? S3M2-97
Why the D.C series motor field winding is wound with thick wire? S3M2-98
Which type of speed control of D.C series motor? S3M2-99
Which type of D.C motor is suitable for shearing machines? S3M2-100
Where D.C compound motors are preferred? S3M2-101
What is the necessity of starter for D.C motor? S3M2-102
Which type of instrument is used to test the armature winding? S3M2-103
Why the holding coil of a 3 point starter is connected in series with shunt field? S3M2-104
What is the best method to change the DOR of a compound motor without change of its characteristics? S3M2-105
What is the purpose of NVC connected in series with the field in 3 point starter? S3M2-106
Which type of DC motor is used for sudden application of heavy loads? S3M2-107
Which speed control method is used in food mixture motors? S3M2-108
Which speed control system provides a smooth variation of speed from zero to above normal? S3M2-109
What is the purpose of tapes in winding? S3M2-110
Which type of DC armature winding the front pitch ($$\rm{Y_F}$$) is greater than back pitch ($$\rm{Y_B}$$)? S3M2-111
What reduces the cross sectional area of core material for VA rating? S3M2-112
How to obtain opposite polarity in adjacent poles of a 4 pole DC motor? S3M2-113
What is the operation in the rewinding process? S3M2-114
Which insulating material used in winding is a highly non -hygroscopic and possess good electrical strength? S3M2-115
Which type of armature winding is illustrated? S3M2-116
Calculate the average pitch ($$\rm{Y_A}$$) for retrogressive wave winding, if No. of armature conductor = 14 No. of slots = 7 No. of poles = 2 S3M2-117
Which type of test is illustrated for the armature after rewound? S3M2-118
Why the newly rewound armature must be preheated before varnishing? S3M2-119
How the direction of rotation of a DC compound motor is changed? S3M2-120
What is the effect in a D.C shunt motor, if its supply terminals are interchanged? S3M2-121
What is the speed, if field winding of a DC shunt motor is in open circuit? S3M2-122
What is the reason for reduction in speed of a D.C shunt motor from no load to full load? S3M2-123
Which winding fault is determined by the test? S3M2-124
Which instrument is used to measure armature winding resistance? S3M2-57
Which instrument is used to test armature winding for short and open circuit? S3M2-58
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