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Practice Test -Electronic Science

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1.
Following are the modulation/ multiplexing techniques:
1. AM
2. FM
3. CDMA
4. WDM



2.
Consider the following statements:
1. Race around condition occurs in a JK flip-flop when both the inputs are one.
2. A flip-flop is used to store one bit of information.
3. A transparent latch consists in D-type in flip-flop.
4. Master-Slave configuration is used in flip-flop to store two bits of information.



3.
The interrupts in 8085 processor are
1. RST 7.5
2. RST 6.5
3. RST 5.5
4. TRAP
Keep the sequence from least priority to highest priority



4.
Consider the following statements with respect to ECL gates:
(i) ECL represents non-saturated logic
(ii) ECL circuits are easy to interconnect with circuits of other families.
(iii) ECL family employs differential amplifier circuitry.
(iv) ECL has the unique feature of providing two outputs which are complementary to each other.
Among the above, which statements are correct?



5. An ideal op-amp has



6.
Consider the following statements in connection with Electrodynamometer type instruments:
(i) They serve as transfer instrument.
(ii) They exhibit square law response.
(iii) They are free from hysteresis.
(iv) They have eddy current damping.
Which are valid?



7. In a normal ECG waveform which wave has the maximum amplitude?



8. The output impedance in an ideal Op-Amp is



9.
Arrange the following in order of increasing wavelength of output wave :
1. He-Ne laser
2. Nd:YAG laser
3. Laser diode operating in 3rdtransmission window
The correct order is



10. The time base of a CRO is controlled by



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