1. Following two signals are used in DMA operation.
(A) INTR & INTA
(B) WAIT & READY
(C) HOLD & HLDA
(D) HOLD & INTA
2. Following is a DMA controller IC
(A) 8086
(B) 8051
(C) 8255
(D) 8237
3. In a DMA read operation the data is transferred
(A) from memory to I/O
(B) from I/O to memory
(C) from memory to memory
(D) from I/O to I/O
4. In a DMA write operation the data is transferred
(A) from I/O to memory
(B) from memory to I/O
(C) from memory to memory
(D) from I/O to I/O
5. Which method bypasses the microprocessor for data transfer?
(A) Interrupt
(B) DMA
(C) Handshaking
(D) Polling
6. DMA stands for
(A) Data Memory Access
(B) Direct Memory Access
(C) Direct Memory Allocation
(D) Data Memory Allocation
7. Which microprocessor pin is used to acknowledge a DMA operation?
(A) HLDA
(B) HOLD
(C) READY
(D) WAIT
8. Number of channels available in 8237 DMA controller
(A) 2
(B) 4
(C) 3
(D) 5
9. The pin of microprocessor is used to request DMA process.
(A) WR
(B) RD
(C) ALE
(D) HOLD
10. The bus that is immediately available to the microprocessor is called
(A) Local bus
(B) Remote bus
(C) Shared bus
(D) All of these