A. External resistance
B. Power dissipation
C. Both (A) and (B)
D. None of the above
✅ The correct answer is option .
Electrical Engineering MCQs
The cold rolled grain oriented steel has _________ permeability in the direction of the grain orientation?
A. minimum
B. maximum
C. nil
D. none of the above
✅ The correct answer is option B.
In Weston synchronoscope the moving coil is connected across______________?
A. bus-bars
B. incoming alternator
C. fixed coils
D. any of the above
✅ The correct answer is option A.
Which of the following device is used to measure vacuum?
A. Barometer
B. Hygrometer
C. U-tube manometer
D. Venturi metre
✅ The correct answer is option C.
A voltmeter should have ____________resistance?
A. Zero
B. Very high
C. Very low
D. None of the above
✅ The correct answer is option B.
A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?
A. 1 O
B. 1 O
C. 100 O
D. 10 O
✅ The correct answer is option D.
In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then________________?
A. XL decreases and XC increases
B. XL increases and XC decreases
C. Line current becomes minimum
D. None of the above
✅ The correct answer is option A.
If the load resistance decreases in a Zener regulator, then Zener current ______________?
A. Decreases
B. Stays the same
C. Increases
D. None of the above
✅ The correct answer is option A.
In a 15 V Zener diode , the breakdown mechanism will occur by ______________?
A. Avalanche mechanism
B. Zener mechanism
C. Both Zener and avalanche mechanism
D. None of the above
✅ The correct answer is option A.
A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation ?
A. 09%
B. 87 %
C. 72 %
D. None of the above
✅ The correct answer is option A.