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In Spin Decoupler, the output of the DC amplifier is applied to which of the following to control the power supplied to the oven heaters?

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In Spin Decoupler, the output of the DC amplifier is applied to which of the following to control the power supplied to the oven heaters?

(a) Power diode

(b) Power transistor

(c) Power MOSFET

(d) Power IGBT

The question was posed to me at a job interview.

This interesting question is from Sensivity Enhancement for NMR Spectroscopy topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

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Correct answer is (b) Power transistor

The explanation: In Spin Decoupler, the output of the DC amplifier is applied to the power transistor to control the power supplied to the oven heaters. The temperature is maintained at plus or minus 1oC.

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