Electronic Instruments(Electrical Engineering Questions ) Questions and Answers

Question 1. An ammeter has a resistance of G ohms and range of I amperes. The value of resistance required in parallel to convert it into an ammeter of range nI is______________?
  1.    nG
  2.    (n-1)G
  3.    G/(n-1)
  4.    G/n
Explanation:-
Answer: Option C. -> G/(n-1)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. A CRO is used to measure _________________?
  1.    Voltage
  2.    Frequency
  3.    Phase
  4.    All of above
Explanation:-
Answer: Option D. -> All of above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. Which of the following is likely to have the largest resistance ?
  1.    Voltmeter of range 10 V
  2.    Moving coil galvanometer
  3.    Ammeter of range 1 A
  4.    A copper wire of length 1 m and diameter 3 mm
Explanation:-
Answer: Option A. -> Voltmeter of range 10 V
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ________________?
  1.    G/50
  2.    G/49
  3.    49 G
  4.    50 G
Explanation:-
Answer: Option B. -> G/49
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. The resistance of an ideal voltmeter is ______________?
  1.    Low
  2.    Infinite
  3.    Zero
  4.    High
Explanation:-
Answer: Option B. -> Infinite
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is________________?
  1.    nG
  2.    G/n
  3.    G/(n-1)
  4.    (n-1)G
Explanation:-
Answer: Option D. -> (n-1)G
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. If the negative potential on the control grid of CRT is increased, the intensity of spot _____________?
  1.    Is increased
  2.    Is decreased
  3.    Remains the same
  4.    None of the above
Explanation:-
Answer: Option B. -> Is decreased
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?
  1.    11 O
  2.    9 O
  3.    100 O
  4.    9 O
Explanation:-
Answer: Option A. -> 11 O
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. An ideal ammeter has ______________ resistance?
  1.    Low
  2.    Infinite
  3.    Zero
  4.    High
Explanation:-
Answer: Option C. -> Zero
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. The horizontal plates of a CRO are supplied with _____________ to observe the waveform of signal?
  1.    Sinusoidal wave
  2.    Cosine wave
  3.    Sawtooth wave
  4.    None of the above
Explanation:-
Answer: Option C. -> Sawtooth wave
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
© Lakshya_Education.com, All Right Reserved.
Contact Us services