Electrical machine design questions with answers
175 multiple-choice questions. Open any question for its answer and explanation.
- Commonly used standard capacitor is
- The stator of a D.C. machine comprises of
- Which of the following is measured by using a vector voltmeter ?
- For measuring current at high frequency we should use
- It is required to measure the true open circuit e.m.f. of a battery. The best device is
- are used for construction of core of electromagnets.
- The high voltage winding is usually which of the following type ?
- are always double layer type.
- The length of air gap to be provided in ______ is primarily determined by power factor consideration.
- A Weston synchronoscope is a
- The cylindrical windings using circular conductors are used for current rating of
- Yokes with rectangular cross-section are used for
- Most common form of
- D.C. servomotors are used in
- In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was
- Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
- In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at
- The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are
- The rectifier instrument is not free from
- Power transformers have rating
- In a low power factor wattmeter the compensating coil is connected
- In a single phase power factor meter the phase difference between the currents in the two pressure coils is
- In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made
- In D.C. machines the usual limit of slot pitch is
- A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly