Electrical Measurements




1.The bridge method commonly used for finding mutual inductance is


(A) Heaviside Campbell bridge (B) Schering bridge

(C) De Sauty bridge (D) Wien bridge


Ans:Heaviside mutual inductance bridge measures mutual inductance is terms 



of a known self-inductance.


2.A dual trace oscilloscope is set to operate in the ALTernate mode. The

control input of the multiplexer used in the y -circuit is fed with a signal

having a frequency equal to
(A) the highest frequency that the multiplexer can operate properly

(B) twice the frequency of the time base (sweep) oscillator

(C) the frequency of the time base (sweep) oscillator

(D) haif the frequency of the time base (sweep) oscillator

Ans: option(C)

3.An ammeter has a current range of 0-5 A, and its internal resistance is 0.2

Ω. In order to change the range to 0-25 A, we need to add a resistance of
(A) 0.8 Ω in series with the meter

(B) 1.0 Ω in series with the meter

(C) 0.04 Ω in parallel with the meter

(D) 0.05 Ω in parallel with the meter

Ans:opion(D)

4.The pressure coil of a dynamometer type wattmeter is

(A) Highly inductive (B) Highly resistive

(C) Purely resistive (D) Purely inductive

Ans:Option (B) is correct.

Since Potential coil is connected across the load terminal, so it should be

highly resistive, so that all the voltage appears across load.

Related Posts:

0 comments:

Post a Comment