|
To avoid formation of grooves in the ___
|
|
0
|
134
|
August 28, 2021
|
|
Which of the following is not a cross-field machine?
|
|
0
|
138
|
August 28, 2021
|
|
The ventilating ducts in most of the dc machines are ___
|
|
0
|
174
|
August 28, 2021
|
|
The efficiency of a dc machine can be determined without directly loading it ___
|
|
0
|
154
|
August 28, 2021
|
|
Generally the no-load losses of an electrical machine is represented in its ___
|
|
0
|
552
|
August 28, 2021
|
|
The overall efficiency of a well designed dc machine may be expected to ___
|
|
0
|
356
|
August 28, 2021
|
|
Reluctance torque in rotating machines is present, when ___
|
|
0
|
376
|
August 28, 2021
|
|
In a dc machine, ohmic or copper losses occur in ___
|
|
0
|
231
|
August 28, 2021
|
|
Before connecting the motor to the supply mains it is necessary to ensure that ___
|
|
0
|
128
|
August 28, 2021
|
|
Hysteresis loss in a dc machine is independent of ___
|
|
0
|
142
|
August 28, 2021
|
|
In Rosenberg generators ___
|
|
0
|
214
|
August 28, 2021
|
|
Field copper losses are constant in dc ___
|
|
0
|
222
|
August 28, 2021
|
|
In the field's test for dc series machines, the difficulty of obtaining readings at ___
|
|
0
|
119
|
August 28, 2021
|
|
The simplest form of a motor controller is ___
|
|
0
|
199
|
August 28, 2021
|
|
The main disadvantage of Hopkinson's test is that ___
|
|
0
|
127
|
August 28, 2021
|
|
If the handle of a three point starter goes back to OFF position, it may be due to ___
|
|
0
|
192
|
August 28, 2021
|
|
In Swinburne's test of determination of efficiency of a dc shunt machine the ___
|
|
0
|
160
|
August 28, 2021
|
|
At starting, the field excitation of a dc shunt motor is kept at its ___
|
|
0
|
190
|
August 28, 2021
|
|
DC machines are generally designed for maximum efficiency around ___
|
|
0
|
123
|
August 28, 2021
|
|
A cumulatively compounded long shunt motor is driving a load at ___
|
|
0
|
125
|
August 28, 2021
|
|
The armature resistance of a PMDC motor is ___
|
|
0
|
194
|
August 28, 2021
|
|
A dc series motor driving an electric train faces a ___
|
|
0
|
484
|
August 28, 2021
|
|
The core (or iron) losses, in a dc machine occur due to ___
|
|
0
|
114
|
August 28, 2021
|
|
In a Ward-Leonard drive, if the field current of the dc generator is ___
|
|
0
|
171
|
August 28, 2021
|
|
In a dc machine mechanical losses occur due to ___
|
|
0
|
124
|
August 28, 2021
|
|
The speed of a dc shunt motor supplying a load at its rated speed can be ___
|
|
0
|
119
|
August 28, 2021
|
|
Regenerative braking is based on that the back emf is ___
|
|
0
|
130
|
August 28, 2021
|
|
The speed of a dc shunt motor may be varied by varying ___
|
|
0
|
203
|
August 28, 2021
|
|
In plugging of a dc shunt motor, the resistance is inserted in the ___
|
|
0
|
291
|
August 28, 2021
|
|
Which of the following dc motors will have highest percentage increase of ___
|
|
0
|
103
|
August 28, 2021
|