MCQ
3721. For ground fault we prefer-
Plain impedance relay
Directional over current relay
Mho relay
Reactance relay
3722. The most severe fault on the power system is-
there phase short circuit
line to line fault
double line to ground fault
single line to ground fault
3723. A circuit breaker is essentially-
an automatic switch
a manual switch
a high-lightning arrester
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 circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit.
3724. Average resistance of human body is-
500 ohms
1000 ohms
1500 ohms
2000 ohms
3725. 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.
3726. 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.
3727. 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.
3728. 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.
3729. The relay used for phase fault protection of short transmission lines is-
Reactance relay
Mho relay
Impedance relay
IDMT relay
3730. The operating speed of a relay depends upon the-
Rate of flux built up
Armature core air gap
Spring tension
All of these
3731. 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.
3732. A thermal protection switch can protect against-
Short-circuit
Overload
Temperature
Over voltage
3733. Factors on which soil resistance depends/RPCI--
depth of the electrode
moisture
Nacl
all the above
3734. In aluminium conductors, steel core is provided to-
compensate for skin effect
neutralise proximity effect
reduce line inductance
increases the tensile strength
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: Aluminium is light in weight and is having good conductivity. But it is having very low tensile strengst To make it suitable to be used as a conductor for the transmission line, we need to increase its tensile strength. To increase the tensile strength steel is used as a core of conductor.
3735. In sheet metal blanking, shear is provided on punches and dies so that--
press load is reduced
good cut edge in obtained
warping of sheet is minimized
cut blanks are straight
3736. 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
3737. 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.
3738. 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.
3739. In SF6 circuit breakers, the SF, gas-
has insulating properties
is non-inflammable
is non-poisonous
all of the above
3740. The main function of a fuse is to-
Protect the line
Open the circuit
Prevent excessive currents
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 main function of the fuse is to provide over curren protection of either the load of source circuit and prevent excessive currents.