Related MCQ Question

• Which portion of the transmission system is more prone to faults?
• Which portion of the power system is least prone to faults?
• The magnitude of fault current depends upon
• The most common type of fault is
• The maximum short-circuit current occurs in the case of  :
• Series reactors are used to
• Current limiting reactors may be 
• Symmetrical components are used in power system for the analysis of
• In a star-connected system without neutral grounding, zero sequence currents are
• A balanced 3-phase system consists of
• The Positive sequence current of a transmission line is  :
• For a fully transposed transmission line
• Zero sequence fault current is absent when fault is
• The current of a single-phase load drawn from a 3-phase system has  :
• The primary function of a fuse is to
• A Circuit breaker normally operates
• For magnetic blow out of arc the magnetic field is produced
• The resistance of an electric arc can be increased by 
• The arc voltage in a circuit breaker is
• The rate of rise of re-striking voltage (RRRV) is dependent upon
• Main purpose of oil in OCB is to 
• The air-blast circuit breakers for  400 kV system are designed to operate in
• Air used in air blast circuit breaker must
• A thermal protection switch provides protection against
• Which of the following circuit breakers produce the least arc energy?
• Which of the following circuit breakers take minimum time in installation?
• Circuit breakers usually operate under 
• The re-striking voltage is measured in
• The making capacity of a circuit breaker is
• Isolators used in transmission lines are capable of breaking  :
• Purpose of backup protection is
• The Buchholz relay protects a transformer from 
• IDMT relays are used to protect the power transformers against 
• Earth fault relays are 
• In distance protection, the relay measures
• Reactance relay is normally used for protection against
• The relay used for phase fault protection of short transmission lines is
• Undervoltage relays are mainly used for
• A bus-bar is rated by 
• Zero-sequence impedance of the transmission line is
• A line trap in a long transmission line is used to 
• A valve type lightning arrestor in a substation should be placed 
• The insulation strength of an  EHV transmission line is mainly governed by 
• Resistance earthing is employed for voltages between 
• Tower footing resistance of a transmission tower should be 
• The earthing transformer is used to
• The voltage of a particular bus is regulated by controlling the 
• What will happen if a short-circuit fault occurs in a switched capacitor controlled reactor?
• Pole mounted substations are used in
• The power transmission capacity of a transmission line is 
• Series capacitors are used to