Electrical Machines Starting Polyphase Induction Motors I Online Exam Quiz
Electrical Machines Starting Polyphase Induction Motors I GK Quiz. Question and Answers related to Electrical Machines Starting Polyphase Induction Motors I. MCQ (Multiple Choice Questions with answers about Electrical Machines Starting Polyphase Induction Motors I
For a 4-pole, 50 Hz induction motor has starting current as 5 times to that of the full load current working at a speed of 1450rpm. The ratio of starting to full load torque will be?
Options
A : 0.83
B : 0.17
C : 0.67
D : 1
For the application requiring high starting torque and minimum starting current, the most suitable starting method will be?
Options
A : Auto transformer starting method
B : Reactance starting method
C : DOL method
D : Star-Delta method
Full voltage starting of induction motor may cause __________
Options
A : dip in the voltages
B : high inrush current
C : high losses
D : all of the mentioned
Series reactor method of starting has main disadvantage of __________
Options
A : lowering the starting power
B : increasing the starting current
C : increasing starting torque
D : all of the mentioned
Auto transformer method of starting has most acceptable method for the starting of the induction motor due to __________
Options
A : maximum torque
B : maximum reduction of inrush current
C : variable tapping
D : all of he mentioned
Starters are required in the induction motor because __________
Options
A : of high starting current
B : they are not self starting
C : torque produced is very low at starting to overcome inertia
D : all of the mentioned
External methods of induction motor starting is employed to __________
Options
A : Reduce the voltage
B : Reduce the current
C : Improve efficiency
D : All of the mentioned
Voltage induce in the induction motor is highest at __________
Options
A : starting
B : standstill
C : rated speed
D : any of the mentioned
Series reactor method of starting has main disadvantage of lowering the starting power. This can be overcome by __________
Options
A : using series resistance
B : using parallel reactor
C : using parallel resistance
D : using series reactor
Electrical Machines Action Commutator more Online Exam Quiz
Electrical Machines Rotating Amplifiers
Electrical Machines Rotor Emf Current Power
Electrical Machines Rotor Frequency
Electrical Machines Speed Control Dc Motors
Electrical Machines Starting Synchronous Motors
Electrical Machines Synchronous Machine Applications
Electrical Machines Synchronous Machine Stability