A total of five nuclear weapons were detonate during Operation Shakti. They were:
Shakti I
A two stage thermonuclear device with a boosted fission primary, its yield was downgraded from 200 kt (theoretical) to 45 kt for test purposes.
Shakti II
A pure fission device using the Plutonium implosion design
with a yield of 15 kt. The device tested was an actual nuclear warhead that can be delivered by bombers or fighters and also mounted on a missile. The warhead was an improved, lightweight and miniaturized version of the device tested in 1974. Scientists at BARC had been working to improve the 1974 design for many years. Data from the 1974 test was used to carry out computer simulations using the indigenous Param supercomputer to improve the design. The 1998 test was intended to prove the validity of the improved designs.
Shakti III
An experimental boosted fission device that used reactor grade Plutonium for its primary with a
yield of 0.3 kt. This test device was used to test only the primary stage. It did not contain any tritium required to boost the fission. This test was designed to study the possibility of using reactor grade plutonium in warheads and also to prove India's expertise in controlling and damping a nuclear explosion in order to achieve a low (sub-kiloton) yield.
Shakti IV
A
0.5 kt experimental device. The test's only purpose was to collect data about the explosion process and to study the performance of various bomb components.
Shakti V
A
0.2 kt experimental device that used U-233, an isotope of uranium that is not found in nature but is produced in India's fast breeder reactors that consume Thorium. This device too was used to collect data.
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India conducted five nuclear tests on May 11 and 13, 1998 at the Pokhran range in Rajasthan which included a 45 kiloton (kt) thermonuclear device, called as hydrogen bomb in common parlance.
The other tests on May 11 included a 15 kt fission device and a 0.2 kt sub-kiloton device. The two simultaneous nuclear tests on May 13 were also in the sub-kiloton range -- 0.5 and 0.3 kt.
Kalam, also scientific adviser to the defence minister, R Chidambaram who was chairman of the Atomic Energy Commission and Anil Kakodkar, then director of Bhabha Atomic Research Centre, were key players in the Pokhran II nuclear tests.
http://articles.timesofindia.indiatimes.com/2009-08-27/india/28154379_1_nuclear-tests-pokhran-ii-nuclear-explosions