8) A transformer has a primary to secondary turns ratio of 1:2.50V rms, 50Hz sine wave is applied at primary winding. The peak secondary voltage will be

100V

25V

141.4V

35.35V

Answer is:

141.4V

ISRO Technician-B Electronic Mechanic Question Paper - 2017 (Set - 1) with Answer Key

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9) A 240 kHz, 10Vpp carrier is amplitude modulated using a 1 kHz sine wave of 3 Vpp. What is the modulation index?

3.3

0.3

0.54

0.6

Answer is:

0.3

10) In and amplitude modulated signal, modulating frequency is 10 kHz and modulation index is 0.6. What should be the best suited RC time constant for the envelop detector?

0.52 msec

0.02 msec

0.20 msec

0.35 msec

Answer is:

0.02 msec

11) The function of ALE signal in 8501 microcontroller is

To extend the memory capacity

To control demultiplexing the address and data bus

To distinguish between external RAM and PROM

To initialize parallel port

Answer is:

To control demultiplexing the address and data bus

12) Which of the following can be employed for position sensing?

LDR

RTD

Potentiometer

Optocoupler

Answer is:

Potentiometer

ISRO Technician-B Electronic Mechanic Question Paper - 2017 (Set - 1) with Answer Key

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8) A transformer has a primary to secondary turns ratio of 1:2.50V rms, 50Hz sine wave is applied at primary winding. The peak secondary voltage will be

141.4V

ISRO Technician-B Electronic Mechanic Question Paper - 2017 (Set - 1) with Answer Key

Related ISRO Technician-B Electronic Mechanic Question Paper - 2017 (Set - 1) with Answer Key

9) A 240 kHz, 10Vpp carrier is amplitude modulated using a 1 kHz sine wave of 3 Vpp. What is the modulation index?

0.3

10) In and amplitude modulated signal, modulating frequency is 10 kHz and modulation index is 0.6. What should be the best suited RC time constant for the envelop detector?

0.02 msec

11) The function of ALE signal in 8501 microcontroller is

To control demultiplexing the address and data bus

12) Which of the following can be employed for position sensing?

Potentiometer

ISRO Technician-B Electronic Mechanic Question Paper - 2017 (Set - 1) with Answer Key