⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs81
In squirrel cage induction motors which of the following methods of starting cannot be used ?
AResistance in rotor circuit
BResistance in stator circuit
CAuto-transformer starting
DStar-delta starting
82
Heat control switches are used in__________________?
Atransformers
Bcooling ranges
Cthree phase induction motors
Dsingle phase
83
In jaw crushers a motor has to often start against ____________________ load?
Aheavy
Bmedium
Cnormal
Dlow
84
For which of the following applications D.C. motors are still preferred ?
AHigh efficiency operation
BReversibility
CVariable speed drive
DHigh starting torque
85
___________________is not a part of ball bearing ?
AInner race
BOuter race
CCage
DBush
86
The starting torque in case of centrifugal pumps is generally_________________?
Aless than running torque
Bsame as running torque
Cslightly more than running torque
Ddouble the running torque
87
Which part of a motor needs maximum attention for maintenance ?
AFrame
BRearing
CStator winding
DRotor winding
88
Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?
AStarting characteristics
BOperating speed
CHorse power
DSpeed control
89
Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
ALight duty
BMedium duty
CHeavy duty
DAll of the above
90
For a particular application the type of electric-and control gear are determined by which of the following considerations ?
AStarting torque
BConditions of environment
CLimitation on starting current
DSpeed control range and its nature E. All of the above