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ELECTRICIAN---AGRICULTURE Related Question Answers
26. Three resistances of 30, 15, 5, ohms are connected in parallel, their combined resistance will be:
greater than 30 ohm between 30 to 15 ohm less than 5 ohm between 15 to 5 ohm
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27. Which of the following acts as a depolarizer in a dry cell ?
zinc chloride carbon powder ammonium chloride manganese dioxide
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30. The magnitude of torque developed by a three phase induction motor depends upon :
rotor current, rotor emf. rotor pf supply voltage, stator current, frequency number of poles, speed, frequency synchronous speed, rotor speed, frequency
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31. Rheostat method of speed control of induction motor is used in :
squirrel cage LM slip ringLM double cage LM all ofthe above
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32. In a three phase IM the number of poles in the rotor winding are :
zero less than stator poles equal to stator pedes more than stator poles
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33. If the air gap of induction motor is increased :
the magnetizing current will increase the pf will increase speed of the motor will increase friction and windage loss will increases
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34. Isolate fire from the supply of oxygen by blanketing it with foam, sand etc.
starving cooling spray water smothering
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35. What is the condition of ohm's law ?
constant resistance constant voltage constant current constant temperature
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40. Kelvin bridge is used for measure :
capacitance low resistance inductance insulation resistance
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42. Application of series parallel combination :
current divider maximum resistance power divider voltage divider
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43. The color of protective conductor :
green - yellow green - red green - blue green - black
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46. High rate discharge tester consists of:
low range ammeter high range voltmeter low range voltmeter high range ammeter
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48. Imaginary line joining the two poles of a magnet:
magnetic equator magnetic pole magnetic lines magnetic field
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49. Rotor copper loss of a three phase induction motor is :
Fractional slip x input power to the rotor Fractional slip x output of the rotor Input power x output power All the above
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