26) Which of the following circuit has a built in Hysteresis?

Filter

Timer

JK Flip Flop

Schmitt Trigger

Answer is:

Schmitt Trigger

ISRO Technician-B Electronic Mechanic Question Paper - 2019 (Set - 1) with Answer Key

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27) The primary of a transformer is connected to a 220 V rms source and has a current of 250 mA rms. The secondary is providing 22 V rms across a 10Ohm load. What is the efficiency of the transformer?

92%

90%

88%

95%

Answer is:

88%

28) What are the characteristics of an ideal operational amplifier?

Infinite output impedance, zero input impedance, infinite bandwidth

Zero output impedance, infinite input impedance, infinite bandwidth

Infinite output impedance, infinite input impedance, narrow bandwidth

Infinite output impedance, zero input impedance, narrow bandwidth

Answer is:

Zero output impedance, infinite input impedance, infinite bandwidth

29) What is the ripple frequency of a full wave bridge rectifier circuit?

Same as the input AC frequency

Twice the input AC frequency

Half the input AC frequency

Four times the input AC frequency

Answer is:

Twice the input AC frequency

30) If the capacitor in a simple RC integrator becomes open due to failure, the output

Would increase exponentially

Would measure the same as the input

Would measure zero volts

None of the above

Answer is:

Would measure the same as the input

ISRO Technician-B Electronic Mechanic Question Paper - 2019 (Set - 1) with Answer Key

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26) Which of the following circuit has a built in Hysteresis?

Schmitt Trigger

ISRO Technician-B Electronic Mechanic Question Paper - 2019 (Set - 1) with Answer Key

Related ISRO Technician-B Electronic Mechanic Question Paper - 2019 (Set - 1) with Answer Key

27) The primary of a transformer is connected to a 220 V rms source and has a current of 250 mA rms. The secondary is providing 22 V rms across a 10Ohm load. What is the efficiency of the transformer?

88%

28) What are the characteristics of an ideal operational amplifier?

Zero output impedance, infinite input impedance, infinite bandwidth

29) What is the ripple frequency of a full wave bridge rectifier circuit?

Twice the input AC frequency

30) If the capacitor in a simple RC integrator becomes open due to failure, the output

Would measure the same as the input

ISRO Technician-B Electronic Mechanic Question Paper - 2019 (Set - 1) with Answer Key