- (A) Voltage drop in arc
- (B) Voltage drop at the anode
- (C) Voltage drop at the cathode
- (D) All of the above
Exam preparation MCQs with answers
Practice Pakistan's most useful MCQs for competitive exams
Prepare for NTS, PPSC, FPSC and subject-wise tests with fresh multiple choice questions, clear options and quick answer reveal.
Latest MCQs
- (A) Mechanical rectifiers
- (B) Copper oxide rectifiers
- (C) Selenium rectifiers
- (D) Electrolytic rectifiers
- (E) Mercury arc rectifiers
- (A) 80%
- (B) 70%
- (C) 60%
- (D) 40%
- (A) graphite
- (B) boron carbide
- (C) aluminium
- (D) copper
- (A) maximum grid voltage
- (B) critical grid voltage
- (C) any of the above
- (D) none of the above
- (A) Copper oxide rectifier is a linear device
- (B) Copper oxide rectifier is not a perfect rectifier
- (C) Copper oxide rectifier has a low efficiency
- (D) Copper oxide rectifier finds use in control circuits
- (E) Copper oxide rectifier is not stable during early life
- (A) magnitude
- (B) polarity
- (C) phase
- (D) any of the above
- (E) none of the above
- (A) They are mechanically strong
- (B) They do not require any voltage for filament heating
- (C) Both (A) and (B)
- (D) None of the above
- (A) 10°C
- (B) 20°C
- (C) 30°C
- (D) 45°C
- (A) 5 to 10 per cent
- (B) 15 to 20 per cent
- (C) 25 to 30 per cent
- (D) none of the above
