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ISRO Technician-B
Electronic Mechanic
ISRO Technician-B Electronic Mechanic 2017
9

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?

3.3

0.3

0.54

0.6

Answer is:

0.3

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

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

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

13) Optical fibre communication works on the principle of

Interference

Total Internal Reflection

Diffraction

Photo Electric Effect

Answer is:

Total Internal Reflection

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

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