Related Questions

Two generators are running in parallel. One of the generators may run as motor for which of the following reasons?
A The direction of that generator is reversed
B The speed of that generator is increased
C The field of that generator is weakened
D That generator takes large share of loads
What will happen if the transformers working in parallel are not connected with regard to polarity?
A The power factor of the two trans-formers will be different from the power factor of common load
B Incorrect polarity will result in dead short circuit
C The transformers will not share load in proportion to their kVA ratings
D Cannot be determined
If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the
A $$\pi $$ mode
B $$\frac{\pi }{2}$$ mode
C $$2\pi $$ mode
D $$\frac{\pi }{4}$$ mode
‘Series aiding’ is a term sometimes used to describe voltage sources of the same polarity in series.
A True
B False
When measuring AC (Alternating Current) with a multimeter, it is important to maintain the proper polarity.
A True
B FALSE
C MEM /C
D SYS:
E None of the above
To determine the polarity of the voltage drop across a resistor, it is necessary to know
A Value of current through the resistor
B Direction of current through the resistor
C Value of resistor
D E.m.f. in the circuit
The polarity of the induced voltage can be determined by using the left-hand generator rule.
A Yes
B No
Which of the following capacitors is marked for polarity ?
A Air
B Paper
C Mica
D Electrolytic
The welding set up is said to have straight polarity, when
A Work is connected to the positive terminal and the electrode holder to the negative terminal
B Work is connected to the negative terminal and the electrode holder to the positive terminal
C Work is connected to the positive terminal and the electrode holder is earthed
D Work is connected to the negative terminal and the electrode holder is earthed
Which of the following generators will be preferred if they are required to be run in parallel?
A Shunt generators
B Series generators
C Compound generators
D None of the above

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