Which of the following capacitors is marked for polarity ?

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

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

In D.C. generators the polarity of the interpoles

A

Is the same as that of the main pole ahead

B

Is the same as that of the immediately preceding pole

C

Is opposite to that of the main pole ahead

D

Is neutral as these poles do not play part in generating e.m.f.

Which of the following capacitors will have the least value of breakdown voltage ?

A

Mica

B

Paper

C

Ceramic

D

Electrolytic

Which of the following capacitors is polarized?

A

Mica

B

Ceramic

C

Plastic-film

D

Electrolytic

Which of the following capacitors is marked for polarity ?

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