The steady-state external performance characteristic of a d.c. generator has the relationship between

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UPSC IES Electrical 2022 Prelims Official Paper
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  1. generated e.m.f. and field current at constant speed
  2. terminal voltage and field current, with constant armature current and speed
  3. generated e.m.f. and field current, with constant armature current and speed
  4. terminal voltage and load current at constant speed

Answer (Detailed Solution Below)

Option 4 : terminal voltage and load current at constant speed
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Detailed Solution

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Solution:
Characteristics of DC generator

No-load charecterstics:- Eg v/s If
Load characteristics:-

  1. Internal characteristics - Eg v/s Ia
  2. External characteristics- Vt v/s IL

Where,
Eg= generated EMF
If= Field Current
Vt= Terminal voltage
IL= Load current 
Ia= Armature current
Hence, the steady state external performance characteristic of a d.c. the generator has a relationship between terminal voltage and load current at a constant speed.

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