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Electrical Engineering
Transmission And Distribution
Quiz 3
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Q.1
The voltage regulation in magnetic amplifier type voltage regulator is effected by
Electromagnetic induction
Varying the resistance
Varying the reactance
Variable transformer
Q.2
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
Q.3
The voltage of the single phase supply to residential consumers is
110 V
210 V
230 V
400 V
Q.4
The wooden poles well impregnated with creosite oil or any preservative compound have life
from 2 to 5 years
10 to 15 years
25 to 30 years
60 to 70 years
Q.5
The material generally used for armour of high voltage cables is
Aluminium
Steel
Brass
Copper
Q.6
Which of the following bus-bar schemes has the lowest cost?
Ring bus-bar scheme
Single bus-bar scheme
Breaker and a half scheme
Main and transfer scheme
Q.7
For aluminium, as compared to copper, all the following factors have higher values except
Specific volume
Electrical conductivity
Coefficient of linear expansion
Resistance per unit length for same cross-section
Q.8
310 km line is considered as
A long line
A medium line
A short line
Any of the above
Q.9
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
Q.10
As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only
31.25 percent of copper
33.3 percent of copper
66.7 percent of copper
125 percent of copper
Q.11
Due to which of the following reasons the cables should not be operated too hot?
The oil may loose its viscosity and it may start drawing off from higher levels
Expansion of the oil may cause the sheath to burst
Unequal expansion may create voids in the insulation which will lead to ionization
All of the above
Q.12
When an alternator connected to the bus-bar is shut down the bus-bar voltage will
Fall
Rise
Remain unchanged
None of the above
Q.13
When a conductor carries more current on the surface as compared to core, it is due to
Permeability variation
Corona
Skin effect
Unsymmetrical fault
Q.14
When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?
Current will flow to earth
Supply voltage will drop
Supply voltage will increase
No current will flow in the conductor
Q.15
The conductors of the overhead lines are
solid
stranded
both solid and stranded
none of the above
Q.16
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
Q.17
In a tap changing transformer, the tappings are provided on
Primary winding
Secondary winding
High voltage winding
Any of the above
Q.18
Galvanized steel wire is generally used as
Stay wire
Earth wire
Structural components
All of the above
Q.19
A circuit is disconnected by isolators when
Line is energized
There is no current in the line
Line is on full load
Circuit breaker is not open
Q.20
Large industrial consumers are supplied electrical energy at
400 V
11 kV
66 kV
400 kV
Q.21
Multi-core cables generally use
Square conductors
Circular conductors
Rectangular conductors
None of the above
Q.22
The corona is considerably affected by which of the following?
Size of the conductor
Shape of the conductor
Surface condition of the conductor
All of the above
Q.23
A booster is a
Series wound generator
Shunt wound generator
Synchronous generator
None of the above
Q.24
Which of the following are the constants of the transmission lines?
Resistance
Inductance
Capacitance
All of the above
Q.25
Pin type insulators are generally not used for voltages beyond
1 kV
11 kV
22 kV
33 kV
Q.26
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 transmission lines
Q.27
By which of the following a bus-bar is rated?
Current only
Current and voltage
Current, voltage and frequency
Current, voltage, frequency and short time current
Q.28
Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?
Static condenser
Synchronous condenser
Tap changing transformer
Booster transformer
Q.29
In a substation the following equipment is not installed
Exciters
Series capacitors
Shunt reactors
Voltaire transformers
Q.30
Transmission voltage of ll kV is normally used for distances upto
20 - 25 km
40 - 50 km
60 - 70 km
80 - 100 km
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