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GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 1
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GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 2
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GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 3
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GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 4
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GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 5
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GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 6
18. Voltage regulators normally use
a. Negative feedbackb. Positive feedbackc. No feedbackd. Phase limiting
19. During regulation, the power dissipation of the pass transistor equals the collector-emitter voltage times the
a. Base currentb. Load currentc. Zener currentd. Foldback current
20. Without current limiting, a shorted load will probably
a. Produce zero load currentb. Destroy diodes and transistorsc. Have a load voltage equal to the zener voltaged. Have too little load current
21. A current-sensing resistor is usually
a. Zerob. Smallc. Larged. Open22. Simple current limiting produces too much heat in the
a. Zener diodeb. Load resistorc. Pass transistord. Ambient air
23. With foldback current limiting, the load voltage approaches zero, and the load current approaches
GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 7
a. A small valueb. Infinityc. The zener currentd. A destructive level
24. A capacitor may be needed in a discrete voltage regulator to preventa. Negative feedbackb. Excessive load currentc. Oscillationsd. Current sensing
25. If the output of a voltage regulator varies from 15 to 14.7 V between the minimum and maximum load current, theload regulation is
a. 0b. 1%c. 2%d. 5%
26. If the output of a voltage regulator varies from 20 to 19.8 V when the line voltage varies over its specified range, thesource regulation is The output impedance of a voltage regulator is
a. Very smallb. Very largec. Equal to the load voltage divided by the load currentd. Equal to the input voltage divided by the output current
27. Compared to the ripple into a voltage regulator, the ripple out of a voltage regulator isa. Equal in valueb. Much largerc. Much smallerd. Impossible to determine
28. A voltage regulator has a ripple rejection of -60 dB. If the input ripple is 1 V, the output ripple isa. -60 mVb. 1 mVc. 10 mVd. 1000 V
29. Thermal shutdown occurs in an IC regulator ifa. Power dissipation is too highb. Internal temperature is too highc. Current through the device is too highd. All the above occur
30. If a linear three-terminal IC regulator is more than a few inches from the filter capacitor, you may get oscillationsinside the IC unless you use
a. Current limitingb. A bypass capacitor on the input pinc. A coupling capacitor on the output pind. A regulated input voltage
GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 8
31. The 78XX series of voltage regulators produces an output voltage that isa. Positiveb. Negativec. Either positive or negatived. Unregulated
32. The 78XX-12 produces a regulated output voltage ofa. 3 Vb. 4 Vc. 12 Vd. 40 V
33. A current booster is a transistor ina. Series with the IC regulatorb. Parallel with the IC regulatorc. Either series or paralleld. Shunt with the load
34. To turn on a current booster, we can drive its base-emitter terminals with the voltage acrossa. A load resistorb. A zener impedancec. Another transistord. A current-sensing resistor
35. A phase splitter produces two output voltages that area. Equal in phaseb. Unequal in amplitudec. Opposite in phased. Very small
36. A series regulator is an example of aa. Linear regulatorb. Switching regulatorc. Shunt regulatord. Dc-to-dc converter
37. The emitter is at ac ground in a
a. CB stageb. CC stagec. CE staged. None of these
38. The output voltage of a CE stage is usually
a. Constantb. Dependent on re'c. Smalld. Less the one
39. The voltage gain equals the output voltage divided by the
GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 9
a. Input voltageb. AC emitter resistancec. AC collector resistanced. Generator voltage
40. The input impedance of the base increases when
a. Beta increasesb. Supply voltage increasesc. Beta decreasesd. AC collector resistance increases
41. Voltage gain is directly proportional to
a. Betab. Ac emitter resistancec. DC collector voltaged. AC collector resistance
42. Compared to the ac resistance of the emitter diode, the feedback resistance of a swamped amplifier should be
a. Smallb. Equalc. Larged. Zero
43. Compared to a CE stage, a swamped amplifier has an input impedance that is
a. Smallerb. Equalc. Largerd. Zero
44. To reduce the distortion of an amplified signal, you can increase the
a. Collector resistanceb. Emitter feedback resistancec. Generator resistanced. Load resistance
45. The emitter of a swamped amplifier
a. Is groundedb. Has no de voltagec. Has an ac voltaged. Has no ac voltage
46. A swamped amplifier uses
a. Base bias
GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 10
b. Positive feedbackc. Negative feedbackd. A grounded emitter
47. In a swamped amplifier, the effects of the emitter diode become
a. Important to voltage gainb. Critical to input impedancec. Significant to the analysisd. Unimportant
48. The feedback resistor
a. Increases voltage gainb. Reduces distortionc. Decreases collector resistanced. Decreases input impedance
49. The feedback resistor
a. Stabilizes voltage gainb. Increases distortionc. Increases collector resistanced. Decreases input impedance
50. An oscillator always needs an amplifier with
a. Positive feedbackb. Negative feedbackc. Both types of feedbackd. An LC tank circuit
51. The voltage that starts an oscillator is caused by
a. Ripple from the power supplyb. Noise voltage in resistorsc. The input signal from a generatord. Positive feedback
52. The Wien-bridge oscillator is usefula. At low frequenciesb. At high frequenciesc. With LC tank circuitsd. At small input signals
53. A lag circuit has a phase angle that isa. Between 0 and +90 degreesb. Greater than 90 degreesc. Between 0 and -90 degreesd. The same as the input voltage
GATE Electronics & Instrumentation Full Prep. Test 1(Questions)
Duration- 3 Hours. Total Marks= 100. 2/3 will be deducted for each wrong answer Page 11
54. A coupling circuit is aa. Lag circuitb. Lead circuitc. Lead-lag circuitd. Resonant circuit
55. A lead circuit has a phase angle that isa. Between 0 and +90 degreesb. Greater than 90 degreesc. Between 0 and -90 degreesd. The same as the input voltage
56. A Wien-bridge oscillator usesa. Positive feedbackb. Negative feedbackc. Both types of feedbackd. An LC tank circuit
57. Initially, the loop gain of a Wien-bridge oscillator isa. 0b. 1c. Lowd. High
58. A Wien bridge is sometimes called a
a. Notch filterb. Twin-T oscillatorc. Phase shifterd. Wheatstone bridge
59. To vary the frequency of a Wien bridge, you can vary
a. One resistorb. Two resistorsc. Three resistorsd. One capacitor
60. The phase-shift oscillator usually has
a. Two lead or lag circuitsb. Three lead or fag circuitsc. A lead-lag circuitd. A twin-T filter
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