How can ammeter and voltmeter are connected in acircuit? why ?

• The ammeters has low resistance so that when it is connected in series with any circuit,it does not change the current.

• The voltmeters has a high resistance and it is so designed that when connected in parallel to the circuit for measuring voltages it does not take appreciable current.

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Why BJT is called current controlled device and FET is called voltage controlled device ?

BJT is a current controlled device because input current controls output current.

FET is voltage controlled device because input voltage (Vgs) controls drain current (Id).

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P.B.College of Engineering Department of Aeronautical Engineering -Asthra'15 National level Technical symposium on -10th JAN 2015

College                 : P.B.College of Engineering

Event Name          : Asthra'15

Department          : Aeronautical Engineering

Event Type           : Symposium

Email id                : pbce.asthra2015@gmail.com

Event Description  : The department of Aeronautical Engineering proudly organises a National level Technical symposium Asthra'15 on 10th JAN 2015.  Its a grand event which 600 students from various institution take part effectively....

Event Address      : Auditorium of P.B.College of Engineering, irungatukottai, Chennai

City               : Chennai

Important Dates    : 10th January 2015

Contact Information:
Student co ordrinator:
1. Inesh waran: 9597594106
2. Arun: 8807412914
3. Ashanth: 8754860720 

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Match the following (Gate EE Question:)

(a) no load and blocked rotor test (P) transformer
(b) sumpners test                          (Q) induction machine
(c) swinberns test                          (R) synchronous m/c
(d) slip test                                     (S) DC m/c

1) a-Q, b-S, c-P, d-Q

2) a-Q, b-P, c-S, d-R

3)a-S, b-R, c-P, d-Q

Answer:  option 2) a-Q, b-P, c-S, d-R

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Why less loss occurs when we use DC supply than AC supply?

• Since the frequency DC of supply is zero, capacitance and inductance does not exists.

• Due to the absence of skin effect, the resistance of DC systems is low as compared to ac systems

• Rac = 1.25 to 1.75*Rdc, so less power loss in DC system than AC system.

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