Control Unit Quiz

What is the primary function of the Control Unit (CU) in a CPU?

• Perform arithmetic operations

• Fetch data from memory

• Direct the operation of the processor and control data flow

• Store instructions in memory

Which of the following components does the Control Unit interact with to execute instructions?

• Memory only

• ALU (Arithmetic Logic Unit) and Registers

• Hard Drive

• Input/Output devices

What is the role of the Instruction Register (IR) in the control unit?

• Holds the next instruction to be executed

• Stores the data to be processed

• Holds the current instruction being decoded and executed

• Stores the address of the next instruction to be fetched

In a Hardwired Control Unit, how are control signals generated?

• Through microprogramming

• By reading control memory

• Using fixed logic circuits

• By software instructions

What does the Program Counter (PC) register hold in the control unit?

• The address of the current instruction

• The address of the next instruction to be executed

• The result of the most recent arithmetic operation

• The address of the last executed instruction

Which of the following is a key difference between a Hardwired and a Microprogrammed Control Unit?

• A hardwired CU is more flexible than a microprogrammed CU

• A microprogrammed CU uses fixed circuits, while a hardwired CU uses microinstructions

• A microprogrammed CU generates control signals using a control memory

• A hardwired CU cannot execute conditional branches

What is the purpose of the Control Bus in computer architecture?

• To transmit data between memory and CPU

• To store the current instruction

• To carry control signals from the Control Unit to other components of the system

• To perform arithmetic operations

Which of the following tasks does the Control Unit NOT perform?

• Fetching instructions from memory

• Decoding the instruction

• Performing mathematical calculations

• Generating control signals for the ALU

What happens when the Control Unit encounters a jump or branch instruction?

• It stops the CPU

• It loads a new program into memory

• It changes the value of the Program Counter (PC)

• It executes the instruction without any change to the PC

In a microprogrammed Control Unit, how are control signals generated?

• Directly by hardware circuits

• By executing a sequence of microinstructions from control memory

• From the ALU output

• By the operating system