⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs111
The capacity of a crane is expressed in terms of_______________?
Atype of drive
Bspan
Ctonnes
Dany of the above
112
Which of the following motors is preferred when quick speed reversal is the main consideration ?
ASquirrel cage induction motor
BWound rotor induction motor E. Synchronous motor
Cmotor
DD.
113
A pony motor is used for the starting which of the following motors ?
ASquirel cage induction motor
BSchrage motor
CSynchronous motor
DNone of the above
114
Besides a constant speed a synchronous rotor possesses which of the following advantages ?
ALower cost
BBetter efficiency
CHigh power factor
DAll of the above
115
For crane travel which of the following motors is normally used ?
ASynchronous motor
BD.
CWard-Leonard controlled
DAC. slip ring motor
116
The characteristics of drive for crane hoisting and lowering are which of the following ?
APrecise control
BSmooth movement
CFast speed control
DAll of the above
117
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
Aslop speed operation
Bhigh starting torque
Clow windage losses
Dall of the above
118
By the use of which of the following m D.C. can be obtained from AC. ?
ASilicon diodes
BMercury arc rectifier
CMotor generator set
DAny of the above
119
Heavy duty cranes are used in________________?
Aore handling plants
Bsteel plants
Cheavy engineering workshops
Dall of the above
120
At room temperature, an intrinsic semiconductor has_______________?
AMany holes only
BA few free electrons and holes
CMany free electrons only
DNo holes or free electrons