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Indian Railways Junior Engineer PR Questions

Part-A (Basics of Electrical engineering)

a) Basic Electronics:
(1) The reverse current in a diode is of the order of
[a] kA
[b] mA
[c] uA
[d]Zero

Answers:
1. Options B and C
2. Option C only
3. Option D only
4. Option A and D only

Ans: 2

(2) The forward voltage drop across a diode is about….
[a] 2.5V
[b] 3V
[c] 10V
[d] 0.7V

Ans: D

(3) A semiconductor diode is used as
Options:
[a] An amplifier
[b] A Rectifier
[c] An oscillator
[d] A voltage regulator

Answers:
1. Options A and C
2. Option B only
3. A, B, C and D
4. Option D only

Ans: 2

(4) A semiconductor diode has…..
[a] One PN junction
[b] Two PN junction
[c] Three PN junction
[d] Four PN junction

Ans: A

(5) A semiconductor diode has forward resistance of order of ohms(22)
Options:
[a] kohms (K2)
[b] 0.1 to 0.5 ohms
[c] Mega ohms
[d] milli ohms

Answers:
1. Option D only
2. Option B only
3. Options A, B, C and D
4. None of the above

Ans: 2

(6) If the arrow of diode symbol is positive with respect to bar, then the diode is…. biased
[a] Forward
[b] Reverse
[c] Either forward or reverse
[d] None of the above

Ans: A

(7) The leakage current in a diode is due to
Options:[a] Minority Carriers
[b] Majority Carriers
[c] Junction Capacitance
[d] None of the above

Answers:
1. Options A, B, C
2. Option B only
3. Options A and B only
4. Option A only

Ans: 4

(8) The DC resistance of a diode is ….. its AC resistance
[a] Same as
[b] More than
[c] Less than
[d] None of the above

Ans: C

(9) An ideal diode is one which behaves as a perfect…. when forward biased
[a] Conductor
[b] Insulator
[c] Resistance material
[d] None of the above

Ans : A

(10) If the temperature of the diode increases, then leakage current….
[a] Remains same
[b] Decreases
[c] Increases
[d] Becomes zero

Ans: C

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