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.
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