Govt Exams Mock Test FREE | Online Quiz Competition

Q1. Two insulator discs of identical capacitance value \(C\) make up a string for a \(22 kV, 50 Hz\), single phase overhead line insulation system. If pin to earth capacitance is also \(C\), then find the string efficiency.

80%

70%

75%

65%

Q2. A transmission line of 210 km length has certain values of A, B, C, D. If the length is made 100 km, then the parameter

A increases and B decreases

A and B both decrease

A and B both increase

A decreases and B increases

Q3. The positive, negative and zero sequence impedances of a 200 MVA, three-phase, 15 kV, star-grounded, 50 Hz generator are j0.15 pu, j0.1 pu and j0.02 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault is __________

76.98 kA

82.48 kA

85.53 kA

88.82 kA

Q4. In a string of suspension insulators the shunt capacitance can be decreased by using

Longer cross-arm

Shorter cross-arm

Longer spans

None of above

Q5. The penalty factor

is always less than 1

is always more than 1

may be more or less than 1

is equal to or less than 1

Q6. With 100% series compensation of lines

Low transient voltage

High transient current

The current is series resonant at power frequency

both (b) and (c)

Q7. Which supply line has highest current rating?

From meter line

From pole line

Sub circuit line

Main circuit line

Q8. Which is correct, when the diversity factor of a plant is increases?

Plant Cost increases

Plant Cost decreases

Higher maximum demand

Higher capacity of plants

Q9. The characteristic impedance of a transmission line with series impedance Z ohm per unit length and shunt admittance Y mho per unit length is given by

\(\sqrt{(Z+Y)}\)

\({(Z+Y)}^2\)

\(\sqrt{\frac{Z}{Y}}\)

\(\sqrt{\frac{L}{C}}\)

Q10. Four identical alternators each rated for 20 MVA, 11 KV having a sub transient reactance of 16% are working in parallel. The shortcircuit level at the bus bars is

500 MVA

400 MVA

125 MVA

80 MVA

Quiz

Year 2024

December
Week # 2 Quiz 5

Q1. Two insulator discs of identical capacitance value \(C\) make up a string for a \(22 kV, 50 Hz\), single phase overhead line insulation system. If pin to earth capacitance is also \(C\), then find the string efficiency.

Q2. A transmission line of 210 km length has certain values of A, B, C, D. If the length is made 100 km, then the parameter

Q4. In a string of suspension insulators the shunt capacitance can be decreased by using

Q5. The penalty factor

Q6. With 100% series compensation of lines

Q7. Which supply line has highest current rating?

Q8. Which is correct, when the diversity factor of a plant is increases?

Q9. The characteristic impedance of a transmission line with series impedance Z ohm per unit length and shunt admittance Y mho per unit length is given by

Q10. Four identical alternators each rated for 20 MVA, 11 KV having a sub transient reactance of 16% are working in parallel. The shortcircuit level at the bus bars is

Quiz

Year 2024

July Week # 1 Expire on 31 Jul 2024

July Week # 2 Expire on 07 Aug 2024

July Week # 3 Expire on 14 Aug 2024

July Week # 4 Expire on 21 Aug 2024

December Week # 2 Quiz 5

Q1. Two insulator discs of identical capacitance value \(C\) make up a string for a \(22 kV, 50 Hz\), single phase overhead line insulation system. If pin to earth capacitance is also \(C\), then find the string efficiency.

Q2. A transmission line of 210 km length has certain values of A, B, C, D. If the length is made 100 km, then the parameter

Q4. In a string of suspension insulators the shunt capacitance can be decreased by using

Q5. The penalty factor

Q6. With 100% series compensation of lines

Q7. Which supply line has highest current rating?

Q8. Which is correct, when the diversity factor of a plant is increases?

Q9. The characteristic impedance of a transmission line with series impedance Z ohm per unit length and shunt admittance Y mho per unit length is given by

Q10. Four identical alternators each rated for 20 MVA, 11 KV having a sub transient reactance of 16% are working in parallel. The shortcircuit level at the bus bars is

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December
Week # 2 Quiz 5