This set of Embedded Systems Multiple Choice Questions & Answers (MCQs) focuses on “DRAM”.
1. Which memory storage is widely used in PCs and Embedded Systems?
c) Flash memory
Explanation: DRAM is used in PCs and Embedded systems because of its low cost. SRAM, flash memory and EEPROM are more costly than DRAM.
2. Which of the following memory technology is highly denser?
d) Flash memory
Explanation: DRAM is highly denser and cheaper because it only uses a single capacitor for storing one bit.
3. Which is the storage element in DRAM?
Explanation: DRAM uses a small capacitor whose voltage represents a binary zero which is used as a storage element in DRAM in which a single transistor cell is used to store each bit of data.
4. Which one of the following is a storage element in SRAM?
Explanation: Four to six transistors are used to store a single bit of data and form a flip-flop logic gate and thus SRAM is faster in accessing data.
5. Which of the following is more volatile?
Explanation: DRAM is said to be more volatile because it has a capacitor as its storage element in which the data disappears when the capacitor loses its charge so even when the device is powered the data can be lost.
6. What is the size of a trench capacitor in DRAM?
a) 1 Mb
b) 4-256 Mb
c) 8-128 Mb
d) 64-128 Mb
Explanation: Trench capacitor can store from 4-256 Mb but planar capacitor can store up to 1 Mb.
7. Which of the following capacitor can store more data in DRAM?
a) planar capacitor
b) trench capacitor
d) non-polar capacitor
Explanation: Stacked-cell can store greater than 1 Gb. Planar capacitor can store up to 1 Mb and trench capacitor can store 4-256 Mb.
8. In which of the memories, does the data disappear?
c) Flash memory
Explanation: Both SRAM and DRAM are volatile memories and flash memory and EPROM are non-volatile memories. DRAM has a storage element as a capacitor whose charge loses gradually thereby losing data.
9. Which of the following is the main factor which determines the memory capacity?
a) number of transistors
b) number of capacitors
c) size of the transistor
d) size of the capacitor
Explanation: The chip capacity is dependent on the number of transistors which can be fabricated on the silicon, and DRAM offers more storage capacity than SRAM.
10. What does VRAM stand for?
a) video RAM
b) verilog RAM
c) virtual RAM
d) volatile RAM
Explanation: Video RAM is a derivative of DRAM. It functions as a DRAM and has additional functions to access data for video hardware for creating the display.
11. What does TCR stand for?
a) temperature-compensated refresh
b) temperature-compensated recovery
c) texas CAS-RAS
d) temperature CAS-RAS
Explanation: The temperature-compensated refresh is one of the refreshing techniques used for extending the battery life by reducing the refresh rate.
Sanfoundry Global Education & Learning Series – Embedded System.
To practice all areas of Embedded System, here is complete set of 1000+ Multiple Choice Questions and Answers.