Relays can be designed to respond to changes in
A). resistance, reactance or impedance
B). voltage and current
C). light intensity
D). temperature
E). all above
all above
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1. A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is
2. A diac is turned on by ___________.
3. Resistance of 220 V, 100 W lamp will be
4. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation
5. The pointer of an indicating instrument should be
6. The Thevenin equivalent voltage (VTH) is the short-circuit voltage between two terminals in a circuit.
7. The disadvantage of a half-wave rectifier is that the___________
8. A 10 Ω resistor, a 90 mH coil, and a 0.015 µF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is
9. Which of the following are the constants of the transmission lines?
10. The advantage of mercury arc rectifier is that
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