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ISRO Technician-B
Electrician
ISRO Technician-B Electrician 2017
65

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

65) A 250V lamp has a total flux of 3000 lumes and takes a current of 0.8 ampere from 250V mains. Its luminous efficiency is

12 lumes per watt

9.6 lumens per watt

15 lumens per watt

240 lumens per watt

Answer is:

15 lumens per watt

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

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

66) The maximum theoretical efficiency of a Class-B push pull transistor amplifier is approximately

25%

50%

70.70%

78.50%

Answer is:

78.50%

67) By which law, the direction of induced emf will be identified

Faraday's first law of electromagnetic induction

Faraday's second law of electromagnetic induction

Lenz's law

Fleming's left hand rule

Answer is:

Lenz's law

68) A D flip-flop can be made from

(a) RS flip-flop

(b) JK flip-flop

(c) RS flip-flop and an inverter

Both (a) and (b)

Answer is:

Both (a) and (b)

69) Age of a father is 3 more than 3 times that of his son. 4 years before age of father was 5 less than 5 times that of his son. Age of the son is

39

12

8

35

Answer is:

12

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

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