Power System MCQs Part 5
Contents
- 1 The symbol for complex power is
- 2 Generally motor devices account for what percentage of power system load
- 3 For limiting current chopping in vacuum circuit breakers, the contact material used has
- 4 Heating and lighting devices account for what percentage of power system load
- 5 I and T are the line current and the torque respectively when DOL starter is used, these quantities when Y/Δ starter is used, are
The symbol for complex power is
The symbol for complex power is:
- P
- Q
- S
- R
Correct answer: 3. S
Generally motor devices account for what percentage of power system load
Generally motor devices account for what percentage of power system load
- 10%
- 30%
- 70%
- 99%
Correct answer: 3. 70%
For limiting current chopping in vacuum circuit breakers, the contact material used has
For limiting current chopping in vacuum circuit breakers, the contact material used has
- Low vapour pressure and high conductivity properties
- Low vapour pressure and low conductivity properties
- High vapour pressure and low conductivity properties
- High vapour pressure and high conductivity properties
Correct answer: 3. High vapour pressure and low conductivity properties
Heating and lighting devices account for what percentage of power system load
Heating and lighting devices account for what percentage of power system load
- 10%
- 30%
- 70%
- 99%
Correct answer: 2. 30%
I and T are the line current and the torque respectively when DOL starter is used, these quantities when Y/Δ starter is used, are
I and T are the line current and the torque respectively when DOL starter is used, these quantities when Y/Δ starter is used, are:
- 1/√3, T/ 3
- 1/3, T/ √3
- 1/√2, T/ √2
- 1/2, T/4
Correct answer: 1. 1/√3, T/ 3