Transmission And Distribution Of Electrical Energy Set 4

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This set of Transmission and Distribution of Electrical Energy Multiple Choice Questions & Answers (MCQs) focuses on Transmission And Distribution Of Electrical Energy Set 4

Q1 | jCorona usually occurs when the electrostatic stress in air around the conductor exceeds
  • 6.6 kV (r.m.s. value)/cm
  • 11 kV (r.m.s. value)/cm
  • 22 kV (maximum value)/cm
  • 30 kV (maximum value)/cm
Q2 | The voltage drop, for constant voltage transmission is compensated by installing
  • inductors
  • capacitors
  • synchronous motors
  • all of above
Q3 | The use of strain type insulators is made where the conductors are
  • dead ended
  • at intermediate anchor towers
  • any of the above
  • none of the above
Q4 | The current drawn by the line due to corona losses is
  • non-sinusoidal
  • sinusoidal
  • triangular
  • square
Q5 | Pin type insulators are generally not used for voltages beyond
  • 1 kV
  • 11 kV
  • 22 kV
  • 33 kV
Q6 | Aluminium has a specific gravity of
  • 1.5
  • 2.7
  • 4.2
  • 7.8
Q7 | For transmission of power over a distance of 200 km, the transmission voltage should be
  • 132 kV
  • 66 kV
  • 33 kV
  • 11 kV
Q8 | For aluminium, as compared to copper, all the following factors have higher values except
  • specific volume
  • electrical conductivity
  • co-efficient of linear expansion
  • resistance per unit length for same cross-section
Q9 | Which of the following equipment, for regulating the voltage in distribution feeder, will bemost economical ?
  • Static condenser
  • Synchronous condenser
  • Tap changing transformer
  • Booster tr
Q10 | In a tap changing transformer, the tappings are provided on
  • primary winding
  • secondary winding
  • high voltage winding
  • any of the above
Q11 | Constant voltage transmission entails the following disadvantage
  • large conductor area is required for same power transmission
  • short-circuit current of the system is increased
  • either of the above
  • none of the above
Q12 | On which of the following factors skin effect depends ?
  • Frequency of the current
  • Size of the conductor
  • Resistivity of the conductor material
  • All of the above
Q13 | The effect of corona can be detected by
  • presence of ozone detected by odour
  • hissing sound
  • faint luminous glow of bluish colour
  • all of the above
Q14 | For transmission of power over a distance of 500 km, the transmission voltage should be inthe range
  • 150 to 220 kV
  • 100 to 120 kV
  • 60 to 100 kV
  • 20 to 50 kV
Q15 | In the analysis of which of the following lines shunt capacitance is neglected ?
  • Short transmission lines
  • Medium transmission lines
  • Long transmission lines
  • Medium as well as long tr
Q16 | When the interconnector between two stations has large reactance
  • the transfer of power will take place with voltage fluctuation and noise
  • the transfer of power will take place with least loss
  • the stations will fall out of step be¬cause of large angular displacement between the stations
  • none of the above
Q17 | The frequency of voltage generated, in case of generators, can be increased by
  • using reactors
  • increasing the load
  • adjusting the governor
  • reducing the terminal voltage
Q18 | When an alternator connected to the bus-bar is shut down the bus-bar voltage will
  • fall
  • rise
  • remain unchanged
  • none of the above
Q19 | The angular displacement between two interconnected stations is mainly due to
  • armature reactance of both alternators
  • reactance of the interconnector
  • synchronous reactance of both the alternators
  • all of the above
Q20 | Electro-mechanical voltage regulators are generally used in
  • reactors
  • generators
  • transformers
  • all of the above
Q21 | Series capacitors on transmission lines are of little use when the load VAR requirement is
  • large
  • small
  • fluctuating
  • any of the above
Q22 | The voltage regulation in magnetic amplifier type voltage regulator is effected by
  • electromagnetic induction
  • varying the resistance
  • varying the reactance
  • variable tr
Q23 | When a conductor carries more current on the surface as compared to core, it is due to
  • permeability variation
  • corona
  • skin effect
  • unsymmetrical fault
Q24 | The following system is not generally used
  • 1-phase 3 wire
  • 1-phase 4 wire
  • 3-phase 3 wire
  • 3-phase 4 wire
Q25 | The skin effect of a conductor will reduce as the
  • resistivity of conductor material increases
  • permeability of conductor material increases
  • diameter increases
  • frequency increases