Question: Aluminium has a specific gravity of___________?

• 1. 1.5
• 2. 2.7
• 3. 4.2
• 4. 7.8

Question: Pin type insulators are generally not used for voltages beyond_________?

• 1. 1 kV
• 2. 11 kV
• 3. 22 kV
• 4. 33 kV

Question: The current drawn by the line due to corona losses is___________?

• 1. non-sinusoidal
• 2. sinusoidal
• 3. triangular
• 4. square

Question: The use of strain type insulators is made where the conductors are__________?

• 1. dead ended
• 2. at intermediate anchor towers
• 3. any of the above
• 4. none of the above

Question: The voltage drop, for constant voltage transmission is compensated by installing__________?

• 1. inductors
• 2. capacitors
• 3. synchronous motors
• 4. all of above

Question: jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?

• 1. 6.6 kV (r.m.s. value)/cm
• 2. 11 kV (r.m.s. value)/cm
• 3. 22 kV (maximum value)/cm
• 4. 30 kV (maximum value)/cm

Question: In a substation the following equipment is not installed?

• 1. exciters
• 2. series capacitors
• 3. shunt reactors
• 4. voltatre transformers

Question: For which of the following equipment current rating is not necessary?

• 1. Circuit breakers
• 2. Isolators
• 3. Load break switch
• 4. Circuit breakers and load break switches

Question: A circuit is disconnected by isolators when____________?

• 1. line is energized
• 2. there is no current in the line
• 3. line is on full load
• 4. circuit breaker is not open

Question: By which of the following a bus-bar is rated?

• 1. Current only
• 2. Current and voltage
• 3. Current, voltage and frequency
• 4. Current, voltage, frequency and short time current