| 1. | A DC generator used for AC welding should have ? | |
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Rising characteristics
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Dropping characteristics
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Straight characteristics
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None of these
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View Answer
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Report Question| 2. | The welding electric circuit is ? | |
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Always earthed
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Never earthed
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Through cables only
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None of these
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| 3. | Direct resistance heating is used in ? | |
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Electrode boiler
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Salt-bath furnace
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Resistance welding
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All option are correct
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| 4. | The main drawback of resistance welding is ? | |
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High initial as well as maintenance cost.
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Difficult shapes and sections cannot be welded.
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Only similar metals can be welded.
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None of these
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| 5. | The process of adding, impurities to a semiconductor is known as ? | |
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polling
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intrusion
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pugging
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doping
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| 6. | In a p-n junction the potential barrier is due to the charges on either side of the junction. These charges are ? | |
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majority carriers
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minority carriers
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Both majority as well as minority carriers
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fixed donor and acceptor ions
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| 7. | The ripple factor is ? | |
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rms value / DC value
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Peak value / DC value
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Peak value / rms value
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s value / Peak value
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| 8. | The output resistance (in M2) of a common base transistor, circuit is of the order of ? | |
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1
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50
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100
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None of these
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| 9. | For proper operation of a transistor, its collector should have ? | |
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proper forward bias
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proper reverse bias
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very small size
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None of these
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| 10. | What- is the characteristics of common collector configuration amplifier with respect to the input and output impedance ? | |
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Low input and high output impedance
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High input and low output impedance
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Low input and low output impedance
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High input and high output impedance
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