Hello Sourabh,
PowerPC is a family of general purpose processors developed initially by Motorola and IBM and used on Apple MACs (not the current one that are intel based).
From our point of view is important to note that PowerPC processors are used in routers and in route processors. In any case they are RISC processor so when needed the procedures for them apply.
For example, PRP-1 route processor for GSR 12000 has a 667 MHz PowerPC processor as main processor.
C7600 / C6500 Sup720 3C 3CXL have PowerPC main processor:
see
http://www.cisco.com/en/US/prod/collateral/routers/ps368/product_data_sheet0900aecd8057f3b6.html
while sup720 up to 3BXL have a MIPS RISC processor.
ASR 1000 have it on the route processor
http://www.cisco.com/en/US/prod/collateral/routers/ps9343/white_paper_c11-452157.html
I think some software based routers can also have a PowerPC processor.
cisco 7201
with Motorola 7448 PowerPC
see
http://www.cisco.com/en/US/prod/collateral/routers/ps341/ps7253/prod_qas0900aecd80630b6c.html
Hope to help
Giuseppe
