The current Frequency in the US is
The current Frequency in the US is: 40 Hz 50 Hz 60 Hz 70 Hz Correct answer: 3. 60 Hz
MCQs
PLC MCQ – Top 10 Programmable Logic Controller MCQs
How much you know about PLCs? Test your PLC knowledge from these Top 10 Programmable Logic Controller MCQs Programmable logic controller or PLC sometimes also referred to as a programmable controller is a type of industrial computer that is available in various sizes. Given below are the top 10 basic MCQs on Programmable logic controllers. … Read more
The highest point on the daily load curve represents – Power Generation MCQ#41
The highest point on daily load curve represents: Demand factor Average demand Peak demand None of these Correct answer: 3. Peak demand The highest point on daily load curve represent the peak demand.
Power System Protection MCQ Part 7
Power System Protection MCQ Part 7 Power System Protection Mho relay is Mho relay is: Voltage restrained overcurrent relay Voltage restrained directional relay Directional restrained overvoltage relay Directional restrained overcurrent relay Correct answer: 2. Voltage restrained directional relay At the instant of contact separation in circuit breaker the current which exists is given the name … Read more
Power System Protection MCQ Part 9
Power System Protection MCQ Part 9 Power System Protection Arc resistance can be increased by: Splitting the arc Reducing its length Increasing its diameter Increasing concentration of ionized particles Correct answer: 1. Splitting the arc Inverse time-current relays are not used for protection of: Alternators Feeders Transformers All of above Correct answer: 1. Alternators Short … Read more
Power System Protection MCQ Part 8
Power System Protection MCQ Part 8 Power System Protection The contact wipe in a Circuit breaker is compulsory for the reason being: Increasing speed of opening Decreasing speed of opening Build dielectric strength across the contacts Correct answer: 3. Build dielectric strength across the contacts The actuating quantity for relays may be: Frequency Magnitude Phase … Read more
Power System Protection Part 10
Power System Protection MCQ Part 10 Power System Protection What is percentage reactance of a 500 kVA transformer having 5% reactance at 1000 KVA base. 2.5% 5% 10% 20% Correct answer: 2. 5% Solution: percentage reactance = Base kVA/Rated kVA*Percentage reactance The stability of arc in vacuum depends on which of the following factors: Contact … Read more
Power System Protection MCQ Part 6
Power System Protection MCQ Part 6 Power System Protection The faults which give rise to equal fault currents in the lines having a displacement of 120L are known as The faults which give rise to equal fault currents in the lines having displacement of 120L are known as: Symmetrical faults Unsymmetrical faults Correct answer: 1. … Read more
Power System Protection MCQ Part 5
Power System Protection MCQ Part 5 Power System Protection Which of following material is used in liquid fuses Which of following material is used in liquid fuses: Water SF6 Transformer oil Carbon tetra chloride Correct answer: 4. Carbon tetra chloride In star connected system, without neutral ground, the zero sequence currents equal In star connected … Read more
Power System Protection MCQ Part 4
Power System Protection MCQ Part 4 Power System Protection The heat produced on contact point due to electric current flow is least affected by which of the following factor The heat produced on contact point due to electric current flow is least affected by which of the following factor: Contact resistance Magnitude of current Duration … Read more