Transformer core is usually manufactured from – Transformer MCQ#73
Transformer core is usually manufactured from: Wood Silicon steel Copper Aluminium Correct answer: 2. Silicon steel
MCQs
The transformer oil must be free from – Transformer mCQ#52
The transformer oil must be free from: Sludge Gases Moisture None of these Correct answer: 3. Moisture
The degree of mechanical vibrations produced by the laminations of a transformer depends on which of the following factors – Transformer MCQ#47
The degree of mechanical vibrations produced by the laminations of a transformer depends on which of the following factors: Tightness of clamping Gauge of laminations Size of laminations All of these Correct answer: 4. All of these
The motor which is useful for high speed and high starting torque applications
The motor which is useful for high speed and high starting torque applications: Capacitor-start motor Universal motor Shaded-pole type motor Capacitor-start and run motor Correct answer: 2. Universal motor
The phase displacement between starting and running winding in a capacitor-start motor is approximately
The phase displacement between starting and running winding in a capacitor-start motor is approximately: 30° 50° 70° 90° Correct answer: 4. 90°
In a capacitor-start and run motors the running capacitor in series with the auxiliary winding plays the role to
In a capacitor-start and run motors the running capacitor in series with the auxiliary winding plays the role to: Double overload capacity Reduce fluctuations in torque Quadruple the overload capacity Improve power factor Correct answer: 4. Improve power factor
Which one of the following statement is correct for capacitor-start single phase motors
Which one of the following statement is correct for capacitor-start single phase motors: Voltage in the starting winding leads the current Voltage in the starting winding lags the current Current in the starting winding and voltage in running winding are in phase None of the above Correct answer: 2. Voltage in starting winding lags the … Read more
The power factor of a single-phase induction motor is mostly – Induction Motor MCQ#73
The power factor of a single-phase induction motor is mostly: Always leading Lagging Unity 0.3 – 0.5 Correct answer: 2. Lagging
The running winding in a split-phase motor has – Induction Motor MCQ
The running winding in a split-phase motor has High resistance and low inductance High resistance as well as high inductance Low resistance as well as low inductance Low resistance and high inductance Correct answer: 4. Low resistance and high inductance
The greater the lagging reactive power a circuit draws, the __________ is its power factor
The greater the lagging reactive power a circuit draws, the __________ is its power factor: Smaller Greater Any of these None of these Correct answer: 1. Smaller The greater the lagging reactive power a circuit draws, the smaller is its power factor