The centrifugal switch is used to disconnect starting winding at which instant: When motor picks up around 10 – 25% of rated speed When motor picks up around 25-35% of rated speed When motor picks up around 50-70% of rated speed Approximately 1.5 minutes after starting motor Correct answer: 3. When motor picks up around … Read more
By shifting position of brushes in repulsion motor __________ can be controlled: Speed Direction Both of these None of these Correct answer: 3. Both of these
The motor which has the highest power to weight ratio: Capacitor-start motor Capacitor run motor Universal motor None of these Correct answer: 4. Universal motor
Which one of the following is practical application of shaded pole motors: Hair dryers Exhaust fans Tape recorders All of these Correct answer: 4. All of these
The single-phase motor which is reversible: Resistance-start split-phase motor Reluctance motor Capacitor-start split-phase motor None of the above Correct answer: 3. Capacitor-start split-phase motor
In a universal motor the width of the brush is nearly: Quarter of the width of commutator segment Half of the width of the commutator segment Equal to width of commutator segment Double the width of commutator segment Correct answer: 4. Double the width of commutator segment
Which one of the following motors will have comparatively higher power factor: Capacitor run motor Capacitor-start motor Split-phase motor Shaded-pole motor Correct answer: 1. Capacitor run motor
Which type of capacitor is preferred for utilization in capacitor-start and run motor: Air capacitor Electrolyte capacitor Paper capacitor Ceramic capacitor Correct answer: 3. Paper capacitor
The motor which will give relatively high starting torque: Capacitor run motor Capacitor-start motor Split-phase motor Shaded-pole motor Correct answer: 2. Capacitor-start motor
The torque developed by a single-phase induction motor at starting is: Rated torque > rated torque < rated torque Zero Correct answer: 4. Zero