71.
An inductive pick-up is used to measure speed of a shaft on which a 120 tooth-wheel is attached. The number of pulses produced per second is 3000. What is the RPM of the shaft?

74.
For a dynamometer-type instrument, the incorrect statement from the following is:

76.
Which one of the following is correct? The generated emf of tachogenerator is

77.
Which of the following line telemetry systems are available?
1. Voltage telemetry system
2. Current telemetry systems
3. Positions telemetry systems
4. Resistivity telemetry systems

80.
The force between two charged particle is given by, $${\text{F}} = \frac{1}{{4\pi {\varepsilon _0}}}\frac{{{{\text{Q}}_{\text{1}}}{{\text{Q}}_{\text{2}}}}}{{{{\text{r}}^2}}},$$    where the symbols have their usual meanings. The dimensions of ∈0 in free space in SI system are:

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