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WorksheetsMotor and Transformer Winding
Total questions: 25
Worksheet time: 50mins
Which material is used to insulate the winding lead connection and terminals?
Fiber glass tape
Millinex paper
Empire sleeve
Micanite paper
Which material is used for wedges in motor winding process?
Hemp thread
Fiber glass sleeve
Bamboo
Tesylene thread
Which type of winding are use in rotor?
Armature
stator
Field coil
Rotor
The figure shown the insulation scheme of the slot conductor in armature core, which protection of insulation is called 'packing streep'?
A
B
C
D
Which part is paper insulation ?
A
B
C
D
The insulating materials used for winding are classified according to their ability to withstand a particular range of temperature.
What is the maximum safe temperature of class "E"insulation?
90 deg
130 deg
120 deg
105 deg
Which one of following insulating materials belong to class "E "insulation ?
Cotton
Silicon elastomer
Leatheroid paper
Glass fiber
Which insulating materials belong to class "B "insulation.
Cotton
Silicon elastomer
Leatheriod paper
Mica
The permissible temperature rise of electrical machine is decidedby the type of
Material used for winding wire
Wedge used for winding
Insulating varnish used
Insulating materials used for winding
The electrical degree of 6 pole AC motor is .
1080
720
540
360
In a single layer winding the required number of coil is?
Equal of the no. of slot
1/2 of the no. of slot
1/4 of the no. of slot
Double of the no. of slot
What will be the slot displacement between the main and starting winding of ceiling fan having the no of pole as
14?
2 slot
1 slot
3 slot
4 slot
pole pitch is called by-
No of pole / Total no of slots
Total no of slots / No of pole
Total no of coil / No of pole
Total no of slots / Total no of coil
For a full pitch 3 phase winding what will be the coil throw , if the coil pitch is 12.
10
11
12
13
How many no of coil are required for 36 slots , 4 pole, 3 phase single layer distributed winding.
36 coil
28 coil
24 coil
18 coil
A 3 phase induction motor having 4 pole and 36 coils,
What are the no of coils in a group / phase / pole?
1
2
3
4
What is the total induction if three inductors (L1, L2 & L3) are connected in series?
Lt= L1 + L2 + L3
Lt = L1 * L2 * L3
Lt = 1/L1 + 1/L2 +1/L3
Lt = 1/L1+L2+L3
Which define the flux density is always lagging behind the magnetising force?
Hysteresis
Magnetic intensity
Magnetic induction
Residual magnetism
What is the effect of unbalance wait of wound armature , while the motor is ruining?
Make no effect
Armature produce vibration and noise
It take more current
It produces sparking
What are the two methode by which polarity of feild of a winding can be checked.
By internal glowler and external gloqler
Magnatic compass and serch coil
Magnatic compass and internal glowler
Serch coil and external glowler
What will happen in a multiple pole fan motor if the polarity of one or two coil are changed
Run in dangerous speed
Produce noise
Run slowiy and produce heat
Not run
What is the purpose of varnish in winding?
To grip in the winding coil
To increase the mechanical strength
To product from execssive heat
To increase the insulation property of winding
When the preheating is to be done while doing winding process.
Before impregnation process
Before varnishing the winding
After impregnation process
Before testing the winding
What is the recommended maximum preheating temperature allowed in winding?
60 deg
90 deg
200 deg
500 deg
What is the unit of flux density?
Weber / meter
Weber
Tesla
Ampere / turns
