Armature reaction in synchronous motor at rated voltage and zero power factor is: Magnetizing Demagnetizing Cross magnetizing Both magnetizing and cross magnetizing Correct answer: 2. Demagnetizing
Variation in DC excitation of synchronous motor causes variation in which of the following: Armature current Power factor Both of these None of these Correct answer: 3. Both of these
The total steady state torque to drive synchronous motor and load at synchronous speed is technically termed as: Pull-out torque Average torque Reluctance torque Synchronous torque Correct answer: 4. Synchronous torque
The major factor on which value of load angle for synchronous motor depends is: Speed Excitation Supply voltage Load Correct answer: 4. Load
Which of the following statements is correct about PLC (Programmable Logic Controllers) The input and output instructions in ladder logic do not directly represent the switches The PLC input instructions are logical symbols associated with the voltage at the input module terminals. The PLC rung output [-( )-] is a discrete output instruction or bit … Read more
Merz-Price protection is best categorized as: Differential protection Distance protection Both of these None of these Correct answer: 1. Differential protection
Merz Price Protection is employed for the protection of: Transformers Alternators Both of these None of these Correct answer: 3. Both of these
Which of the following is employed for providing protection against direct lightning strokes and high voltage steep waves: Lighting areesster Ground wires Both of these None of these Correct answer: 3. Both of these
Power equipment receives the amount of damage from voltage surge whose value depends on: Steepness of wave front Amplitude of surge Both of these None of these Correct answer: 3. Both of these
The protection devices provided against overvoltage in power systems mainly takes care of: Resonance Lightning surges Insulation failure None of these Correct answer: 2. Lightning surges