MCQ
3761.
For the protection of lines against faults Involving variable fault resistance, the preferred relaying scheme is a-
Plain impedance relay
Directional over-current relay
Mho relay
Reactance relay
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: Reactance type relay is very suitable as a ground relay for ground fault because its reach is not affected by Jault impedance.
3762.
An ideal location for the substation would be at ---the of load.
Centre of gravity
Load centre
Nearer to consumer
None of the above
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: Ideal location for an electrical substation for a grang building will be at the electrical load center.
3763.
Factors on which soil resistance depends/RPCI--
depth of the electrode
moisture
Nacl
all the above
3764.
Where severe synchronising swing occur, the relay employed is
Impedance relay
Mho relay
Reactance relay
Induction relay
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: Mhe relay can protect from power swing better than impedance relay and has the directional property which 1 is essential in transmission lines.
3765.
The under voltage relay can be used for--
Generators
Bus bars
Transformers
All of the above
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: Under voltage relay used for protection against voltage drops, to detect short-circuit fault, also used motor, alternators and in busbars.
3766.
Surge absorbers are used for protection against-
High-voltage low-frequency oscillations
High-voltage high-frequency oscillations
Low-voltage high-frequency oscillations
Low-voltage low-frequency oscillations
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: Surge observers are used for protection against low- voltage high frequency oscillations.
3767.
Which of the following equipment is used to limit short circuit current level in a sub-station?
Isolator
Lightning switch
Coupling capacitor
Series reactor
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: Series reactors are mosily sard to limit short circuit current level in a substation.
3768.
Admittance relay-
Non-directional relay
Directional relay
Differential relay
None of the above
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: A mo relay is a high-speed relay and is also known as the infmittance relay. In this relay operating torque is obtained by the voli-amperes element and the controlling element is developed due to the voltage element. It means a mho relay is a sobage controlled directional relics.
3769.
The voltage of a particular bus is regulated by controlling the --
Active power of the bus
Reactive power of the bus
Phase angle
Phase angle and reactive power
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: The voltage of a particular bus can be controlled by controlling the active power of the bus
3770.
For ground fault we prefer-
Plain impedance relay
Directional over current relay
Mho relay
Reactance relay
3771.
Average resistance of human body is-
500 ohms
1000 ohms
1500 ohms
2000 ohms
3772.
The bus-bar zone, the purpose of protection includes-and-
Bus-bars, isolating switches, circuit breakers
Transformers, relays, circuit breakers
Transformers, conductors and relays
None of the above
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: The busbar zone, for the purpose of protection, includes not only the busbars themselves but also the isolating switches, circuit breakers and the associated connections.
3773.
The over-voltage surge in power systems may be caused by-
Lightning
Resonance
Switching
All of the above
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: The main cause of these voltage surges in power system are due to lighting impulses and switching impulses of the system.
3774.
Outdoor sub-station requires-space.
Less
More
Medium
Any of the above
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: More space is required for the outdoor, subutatione Protection devices are required to be installed for the protection against lighting surges.
3775.
The relay used for feeder protection --
Under voltage relay
Translay relay
Thermal relay
Buchholz relay
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
সুইচ গিয়ার এন্ড প্রটেকশন mcq
Switch gear and protection mcq all
ব্যাখ্যা: ব্যাখ্যা: The armingement is similar to over current relay, but the secondary winding is not closed on nelf. These types of relays are ward in the feeder protection and the scheme is called the Translay relay
3776.
The relay used for phase fault protection of short transmission lines is-
Reactance relay
Mho relay
Impedance relay
IDMT relay
3777.
The relay with inverse time characteristic will operate within--
1.5 sec
5 to 20 sec
5 to 10 sec
20 to 30 sec
3778.
The single phasing relays are used for the protection of-
Single phase motors only
Two phase motors only
Two single phase motors running in parallel
Three phase motors
3779.
In the case of transmission line protection, over current relay is used-
Only up to 110kV
Only up to 220kV
Only up to 50k V
Only up to 1100k V
3780.
-relays are preferred for phase fault on short transmission line
Induction type
Reactance
Impedance
None of the above