371. Q U I Z NO. 8

Q U I Z    NO.  8

Electronics

1Q. What causes electric shock?

The damaging effect of shock are result of current passing through your body. The current is caused by voltage applied.

2Q. What is an ampere?

Flow of 1 coulomb of electric charge per second.

3Q. what is electro motive force?

It is the potential  difference that moves electrons through a circuit.

4Q. Is electric resistance greater in a short fat wire or long thin wire?

It is in long thin wire. It is because R [ proportional] X length/area.

5Q. How  does wetness affect the resistance of your body?

It lowers body resistance.

ELECTRICAL OBJECTIVE QUESTIONS WITH ANSWERS

 [6] The unit which indicates the rate at which energy is expended?
A. Watt           B. Ampere-hour          C. Coulomb     D. Volt            Ans:A

Answer

[7] The peak voltage in an ac wave is always
A. greater than the average voltage                B. less than the average voltage
C. greater than or equal to average voltage    D. less than or equal to the average voltage

Ans: C

Answer

[8] When an electrical charge exists but there is no flow of current, the charge is said to be
A. ionizing                  B. electronic                C. Static          D. Atomic       Ans: C

Answer

[9] As the number of turns in a coil that carries ac increases without limit, the current in the coil will
A. Eventually become very large                    B. Stay the same
C. Decrease, approaching zero                        D. Be stored in the core material

Ans: C

Answer

[10] As the number of turns in a coil increases, the reactance at a constant frequency
A. Increases                B. Decreases               C. Stays the same       

D. Is stored in the core material                      Ans:A

Answer

[11] In an RL circuit, as the ratio of inductive reactance to resistance (XL/R) decreases, the phase angle
A. Increases                B. Decreases               C. Stays the same
D. Becomes alternately positive and negative

Ans: B

Answer

[12] The best filter for a power supply is
A.  a capacitor in series                       B.  a choke in series
C.  a capacitor in series and a choke in parallel          

D.  a capacitor in parallel and a choke in series

Ans: D

Answer

[13] Voltage regulation can be achieved by a zener diode connected in
A.  parallel with the filter output, forward biased
B.  parallel with the filter output, reverse biased
C.  series with the filter output, forward biased
D.  series with the filter output, reverse biased

Ans:B

Answer

[14] A current surge takes place when a power supply is first turned on because
A.  the transformer core is suddenly magnetized
B.  the diodes suddenly start to conduct
C.  the filter capacitor must be initially charged
D.  arching takes place in the power switch

Ans: C

Answer

[15] A dc electromagnet
A. has constant polarity
B. Requires an air core
C. Cannot be used to permanently magnetize anything
D. Does not attract or repel permanent magnet

Ans: A