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EE/Alter

Quiz by Dr. Joseph

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35 questions
Show answers
  • Q1
    Majority of 3 phase alternators in use have
    stationary field winding
    none of these
    rotating armature winding
    rotating field winding
    30s
  • Q2
    Alternators mostly work on rotating field type principle which is difference from dc machines where the field is stationary. Therefore the alternators
    do not obey Lenz law
    don't obeey Ohms law
    don't obey Faradays law
    work on Faradays law
    30s
  • Q3
    High speed alternators have a rotor construction of
    salient pole type
    squirrel cage type
    non-salient pole type
    dc armature type
    30s
  • Q4
    Alternators are designed to generate
    definite power factor
    definite frequencies
    definite currents
    variable frequencies
    30s
  • Q5
    The diameter of high speed turbo generators as compared to hydroelectric ones are
    none of these
    larger because speed is high
    smaller because speed is loss
    smaller because speed is high
    30s
  • Q6
    The slip rings employed in a 3 phase alternator in hydrostation are insulated for
    very high voltage
    full armature voltage
    extra high voltage
    low voltage
    30s
  • Q7
    When the speed of the alternator increases, the frequency
    remains the same
    decreases
    increases
    none of these
    30s
  • Q8
    When load power factor is unity, the armature flux of an alternator is
    demagnetizing
    aiding the field flux
    square the ware
    cross-magnetizing
    30s
  • Q9
    High voltage alternators are usually of the rotating field type. This means the generated voltage is applied
    directly to rotor
    none of these
    through slip rings to load
    directly to load
    30s
  • Q10
    One of the advantages of a short pitched winding is the
    elimination of harmonics
    increase of induction
    reduction of voltage
    reduction of circulating current
    30s
  • Q11
    Pitch factor is the ratio of the emf's of
    distributed winding to full pitch winding
    short pitch coil to full pitch coil
    concentrated winding to distributed winding
    full pitch winding to distributed winding
    30s
  • Q12
    The imaginary or fictitious part of synchronous reactance takes care of
    armature reaction
    copper losses
    voltage regulation
    inductance reactance
    30s
  • Q13
    Synchronous reactance consists of two components, namely
    leakage reactance and capacitive reactance
    none of these
    leakage reactance and fictitious reactance
    armature resistance and leakage reactance
    30s
  • Q14
    One of the advantages of distibruting the winding in alternators is to
    improve voltage wave form
    decrease the value of the voltage
    reduce harmonices
    reduce the amount of copper
    30s
  • Q15
    Distribution factor is the ratio of the emf's to
    concentrated winding to distributed winding
    distributed winding to full pitch winding
    distributed winding to concentrated winding
    full pitch winding to distributed winding
    30s

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