Mining Techniques BDC Practice Questions (Page 7)

Questions 31–35

1. 31expert · hard

   A miner is evaluating the profitability of a new ASIC. The ASIC costs $3,000, has a hash rate of 100 TH/s, and consumes 3,000 W. Electricity costs $0.10/kWh. The current network difficulty and block reward result in an expected daily revenue of $15. What is the approximate payback period, ignoring pool fees and difficulty changes?

   • AAbout 200 days
   • BAbout 385 days
   • CAbout 500 days
   • DAbout 250 days
   Reveal Solution Discussion Select an answer first
2. 32foundation · easy

   How do transaction fees become part of a mined block?

   • AThe network automatically deducts a fee from every transaction and sends it to the miner
   • BTransaction fees are paid to the previous block's miner, not the current one
   • CThe miner selects transactions from the mempool and collects the fees attached to those transactions
   • DThe miner adds a fee to each transaction before including it in the block
   Reveal Solution Discussion Select an answer first
4. 33application · medium

   A miner has just found a valid block and is about to propagate it to the network. What is the correct sequence of actions they should take?

   • AWait for the next difficulty adjustment before broadcasting.
   • BBroadcast the block to peers, then wait for confirmation before including transactions.
   • CInclude the coinbase transaction, then broadcast the block to the network.
   • DBroadcast the block first, then add the coinbase transaction.
   Reveal Solution Discussion Select an answer first
5. 34foundation · easy

   What is the purpose of the difficulty adjustment in a PoW blockchain?

   • ATo reduce the size of the blockchain over time
   • BTo make it easier for small miners to find blocks
   • CTo keep the average block time consistent as the network hash rate changes
   • DTo increase the block reward when more miners join the network
   Reveal Solution Discussion Select an answer first
6. 35application · medium

   A miner is calculating future revenue for a PoW coin that has a block reward of 12.5 coins and an average transaction fee per block of 0.5 coins. The next halving will reduce the block reward to 6.25 coins. Assuming transaction fees remain constant, what will be the miner's average reward per block after the halving?

   • A13 coins
   • B12.5 coins
   • C6.75 coins
   • D6.25 coins
   Reveal Solution Discussion Select an answer first