For an NPN transistor, if the Base Emitter junction is in forward biased and Base collector junction is in reverse biased, the mode of operation is:

This question was previously asked in
ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 3
View all RRB ALP Papers >
  1. Reverse cutoff
  2. Cutoff
  3. Saturation
  4. Forward active

Answer (Detailed Solution Below)

Option 4 : Forward active
Free
General Science for All Railway Exams Mock Test
2.1 Lakh Users
20 Questions 20 Marks 15 Mins

Detailed Solution

Download Solution PDF

In Transistors biasing is done to keep stable DC operating conditions needed for its functioning as an amplifier. A properly biased transistor must have its Q-point (DC operating parameters like IC and VCE) at the centre of saturation mode and cut-off mode i.e. active mode.

In the active mode of transistor operation, the base-emitter junction is forward biased and the base-collector junction is reverse biased.

Important Point:

Different modes of BJT operations

Mode

Emitter -base Junction

Collector-Base Junction

Cut off

Reverse

Reverse

Active

Forward

Reverse

Reverse Active

Reverse

Forward

Saturation

Forward

Forward

Latest RRB ALP Updates

Last updated on Jul 4, 2025

-> RRB ALP CBT 2 Result 2025 has been released on 1st July at rrb.digialm.com. 

-> RRB ALP Exam Date OUT. Railway Recruitment Board has scheduled the RRB ALP Computer-based exam for 15th July 2025. Candidates can check out the Exam schedule PDF in the article. 

-> Railway Recruitment Board activated the RRB ALP application form 2025 correction link, candidates can make the correction in the application form till 31st May 2025. 

-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.

-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.

-> The official RRB ALP Recruitment 2025 provides an overview of the vacancy, exam date, selection process, eligibility criteria and many more.

->The candidates must have passed 10th with ITI or Diploma to be eligible for this post. 

->The RRB Assistant Loco Pilot selection process comprises CBT I, CBT II, Computer Based Aptitude Test (CBAT), Document Verification, and Medical Examination.

-> This year, lakhs of aspiring candidates will take part in the recruitment process for this opportunity in Indian Railways. 

-> Serious aspirants should prepare for the exam with RRB ALP Previous Year Papers.

-> Attempt RRB ALP GK & Reasoning Free Mock Tests and RRB ALP Current Affairs Free Mock Tests here

Get Free Access Now
Hot Links: teen patti game - 3patti poker teen patti master update teen patti cash game