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MCQ
821. কোন বৈশিষ্ট্যের কারণে RAM স্থায়ী স্মৃতি-স্টোরেজ হিসাবে ব্যবহার অনুপযোগী?
RAM is a volatility memory. RAM is a part of Computer's main URAM directly accessible by CPU. RAM is used to read and write data into it which is a accessed by CPU randomly.
Too Slow
Unreliable
Volatility
Too Bulky
822. MCB stands for-
ব‍্যাখ্যা: MCB of Miniature Circuit Breaker automatically switches off the electrical circuit during an abnormal condinon of the network means in overload condition as well as faulty condition. Now a days we use an MCB in a low voltage electrical network instead of a fuse.
Miniature Circuit Breaker
Minimum Capacity Breaker
Molded Circuit Breaker
Maximum Capacity Breaker
824. একটি কম্পিউটারের Basic components হচ্ছে-
Input/Output devices, RAM and motherboard
Keyboard, monitor, memory and CPU
ক এবং খ উভয়ই
Keyboard, hard disk, processor and monitor
827. A fuse wire is made of-
ব‍্যাখ্যা: A fuse wire is made of lead-tin alloy as they have low melting point as well as they have high resistance.
Copper
Tungsten
Nichrome
Lead-tin alloy
831. Zero sequence current is used for relaying purpose only in the case of--
ব্যাখ্যা: The zero sequence currents are passing through this relay for protection of electrical equipment like generator, transformer ect and the relay is called nank fault relay
Phase over-current relay
Phase impedance relay
Ground over-current relay
Ground impedance relay
832. Which is the main relay for protecting up to 90% of the transmission line-length in the forward direction?
ব‍্যাখ্যা: The relay is called Mha relay because its character is a straight line, when Plotted on an adminance diagram. It is inherently a directional relay as it desee the fault only in the forward direction
Directional over-current relay
Mho relay
Carrier current protective relay
Impedance relay
834. Which one of the following relay has the capability of anticipating the possible major fault in a transformer?
ব‍্যাখ্যা: Buchholz relay is the gas detector relay word to prot transformers. It operates when the oil level in the conservator pipe of a transformer is lowered by De accumulation of gas caused by a poor connection or by an incipient break down of insulation
Over current relay
Differential relay
Buchholz relay
Over-fluxing relay
835. How many relays are used to detect inter phase fault of a three-line system?
ব্যাখ্যা: Three relays are used to detect the inter phase foult of a three-line system. A relay is used when there is a nend to control a circuit with either high voltage or power using a low voltage circuit.
One
Two
Three
Six
836. Material used for fuse must have--
Low-melting point & low-specific resistance
High-melting point & low-specific resistance
High-melting point & high-specific resistance
Low-melting point & high-specific resistance
837. WINDOWS কী?
Windows হলো Microsoft Corporation নামের একটি বিখ্যাত IT Company দ্বারা তৈরি করা একটি Graphical Interface Operating System. এই Operating System-টিকে ব্যবহার করা হয় বিভিন্ন Device-গুলোকে পরিচালনা ও নিয়ন্ত্রণ করার ক্ষেত্রে। যেমন- Computer, Laptop Smartphone-গুলোতে Microsoft-এর Windows OS ব্যবহার করা হয় সেগুলোকে পরিচালনা ও নিয়ন্ত্রণ করার জন্য।
Antivirus software
Data strong device
Operating system
Programming language
838. সিগন্যালের পারস্পরিক রূপান্তর করে-
Modem Modem is short for Modulater- Demodalater. Modem converts analog signals m digital and vice versa, it may be considered an Analog to digital converter or digital to analog converter. Roster : Router connect two or more different networks Hub : A hub is a physical layer networking device which is used to connect multiple devices in a network. Gateway: A gateway is a hardware device.
রাউটার
হাব
গেটওয়ে
মডেম
839. Both voltage and current signals are required for-
ব্যাখ্যা: Directional relay operates when the fault is driving power to flow in particular direction
A plain over-current relay
A differential relay
A directional relay
A biased directional relay
840. Lightning arrester is used for-
Protection of equipment from external lightning
Protection of equipment from short circuits
Protection of equipment from open circuits
All of the above