Transmission And Distribution Of Electrical Energy Set 4
On This Page
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