Q. An accurate ammeter must have a resistance of -
1) high value
2) very high value
3) low value
4) very low value
Q. Utrasonic amplification through electron-photon interaction is generally achieved using a -
1) Supreconductor
2) Piezoelectric material
3) Paramagnetic material
4) Elemental semiconductor
Q. The temperature coefficient of resistance of an insulator is -
1) Negative and independent to temperature
2) Negative and dependent on temperature
3) Positive and dependent on temperature
4) Positive and independent of temperature
Q. An ammeter is a -
1) recording instrument
2) integrating instrument
3) absolute instrument
4) secondary instrument
Q. What is an energy gap ?
1) The energy equal to the energy acquired by an electron passing a IV electric field
2) Energy difference between conduction band and valence band
3) An energy level at which an electron can exist
4) The space between two orbital shell
Q. A potentiometer may be used for -
1) Measurement of energy
2) Measurement of resistance
3) Calibration of ammeter and voltmeter
4) Measurement of current
Q. As compared to oscillators an inverter provides -
1) low voltage output
2) noiseless output
3) noiseoless output
4) distortionless output
Q. The multiplier and the meter coil in a voltmeter are connected in -
1) No connection
2) Mixed
3) Series
4) Parallel
Q. A coil having an inductance of 75 H is carrying a current of 100 A. If the current is reduced to zero in 0.2 second, the self-inductance e.m.f. will be -
1) 375 V
2) 500 V
3) 125 V
4) 750 V
Q. Which semi-conductor deice acts like a diode and two resistors ?
1) SCR
2) Diac
3) Triac
4) UJT
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