**151. Metal tin becomes superconductor at approximately**

A.

6 K

**B. 3.7 K **

C.

5 K

D.

4.7 K

**152. In a complex resistance-reactance plane, XL is
represented**

A.

By an axis opposite the R axis

B.

By an axis perpendicular to the XC axis

**C. By an axis opposite the XC axis**

D.

By an axis parallel to the R axis

**153. When the net reactance in a series coil-capacitor circuit**

is zero at frequency f, the nature of its reactance of frequency 2f is

is zero at frequency f, the nature of its reactance of frequency 2f is

**A. Inductive**

B.

Capacitive

C.

Resistive

D.

Infinite

**154. Which of the following is a way of decreasing mutual**

inductance?

inductance?

A.

Moving the coils closer

**B. Moving the coils apart**

C.

Decreasing the number of turns of either coil

D.

Increasing the number of turns of either coil

**155. The charging of a capacitor through a resistance obeys**

**A. Exponential law**

B.

Logarithmic law

C.

Linear law

D.

Square law

**156. The Q-factor of a parallel resonant circuit is also known**

as

as

A.

Voltage magnification factor

**B. Current magnification factor**

C.

Gain magnification factor

D.

Resonance magnification factor

**157. What is the specific resistance of a pure silicon?**

A.

55 Î©-mm

B.

55 Î©-m

**C. 55 Î©-cm**

D.

55 kÎ©-m

**158. A capacitance of 0.05 Î¼F equals**

A.

0.05 x 106 F

**B. 0.05 x 10-6 F**

C.

0.05 x 10-12 F

D.

0.05 x 1012 F

**159. A 5 Î¼F capacitor charge to 5V has a stored charge equal to**

A.

1 Î¼c

B.

5 Î¼c

**C. 25 Î¼C**

D.

200 Î¼c

**160. The factor 0.707 for converting peak to rms applies only to**

A.

Square waves

B.

Triangle waves

C.

Sawtooth waves

**D. Sine waves**

**161. When two in-phase sine waves that have identical frequency**

and amplitude are added together, then the result is a sine wave with ___ the

amplitude of either.

and amplitude are added together, then the result is a sine wave with ___ the

amplitude of either.

A.

Half

**B. Twice**

C.

Four times

D.

One-fourth

**162. Liquids that are good conductors because of ionization are**

called

called

A.

Electrolytic

B.

Bases

C.

Acid

**D. Electrolytes**

**163. Tungsten filament of bulbs has a hot resistance higher than**

its cold resistance due to its temperature coefficient which is

its cold resistance due to its temperature coefficient which is

**A. Positive**

B.

Negative

C.

Zero

D.

Infinite

**164. A term used to express the amount of electrical energy**

stored in electrostatic field.

stored in electrostatic field.

**A. Joules**

B.

Coulombs

C.

Watts

D.

Electron-volt

**165. With double the number of turns by the same length and**

area, the inductance is

area, the inductance is

A.

The same

B.

Doubled

C.

Quartered

**D. Quadrupled**

**166. The temperature coefficient of resistance of electrolytes**

is

is

**A. Negative**

B.

Positive

C.

Zero

D.

Infinite

**167. What refers to the lowest voltage across any insulator that**

can cause current flow?

can cause current flow?

A.

Conduction voltage

B.

Critical voltage

**C. Breakdown voltage**

D.

Voltage capacity

**168. Capacitance increase with**

**A. Larger plate area and less distance between plates**

B.

Larger plate area and greater distance between plates

C.

Smaller plate area and less distance between plates

D.

Higher values of applied voltage

**169. What is the resonant frequency of a circuit when L of 3**

microhenrys and C of 40 picofarads are in series?

microhenrys and C of 40 picofarads are in series?

A.

14.5 kHz

B.

145 MHz

**C. 14.5 MHz**

D.

145 kHz

**170. For a triangular and sawtooth waveform the rms voltage or**

current equals

current equals

A.

0.707 times peak value

**B. 0.577 times peak value**

C.

0.577 times average value

D.

0.707 times rms value

**171. If two resistances of 9 Î© and 6 Î© are connected in**

parallel, the total resistance is

parallel, the total resistance is

A.

54 Î©

B.

0.3 Î©

C.

15 Î©

**D. 3.6 Î©**

**172. Refers specifically to steady state values of quantities in**

ac circuits which are complex numbers.

ac circuits which are complex numbers.

A.

Domain

B.

Scalar quantity

C.

Vector quantity

**D. Phasor quantity**

**173. A capacitor is used to**

**A. Block dc current**

B.

Pass dc current

C.

Open voltage source

D.

Short the voltage source

**174. The usual load of a dc circuit is a/an**

**A. Resistor**

B.

Capacitor

C.

Inductor

D.

Both inductor and capacitor

**175. The second strip of an electronic resistor color-code**

represents

represents

A.

The multiplier

**B. The second digit of the value**

C.

The temperature

D.

The tolerance

**176. Which of the following is a preferred resistor value?**

A.

520

**B. 47**

C.

43,000

D.

54,321

**177. A three-by-three, series-parallel matrix of resistors, all**

having the same ohmic value, would have a net resistance of

having the same ohmic value, would have a net resistance of

A.

One-third the value of a single resistor

B.

Three times the value of a single resistor

**C. The same value as a single resistor**

D.

Nine times the value of a single resistor

**178. In an ac wave, 30 degrees of phase is ___ of a cycle.**

A.

Â½

**B. 1/12**

C.

1/3

D.

1/30

**179. What is the value of a carbon composition resistor with the**

following color code: Brown, white, orange, red

following color code: Brown, white, orange, red

A.

190 Î©; 10 %

**B. 19 kÎ©; 2 %**

C.

19 kÎ©; 20 %

D.

1.9 kÎ©; 2 %

**180. The electric field strength between capacitor plates has a**

unit of

unit of

A.

Volts per meter

B.

Volts per mil

C.

Amperes per meter

D.

Amperes per mil

**181. For multi-plate capacitor, capacitance is proportional to**

**A. Number of plates less one(n â€“ 1)**

B.

Number of plates plus one(n + 1)

C.

Number of plates less two(n – 2)

D.

Number of plates (n)

**182. A capacitor consists of two**

A.

Conductors only

B.

Dielectric only

**C. Conductors separated by a dielectric**

D.

Dielectric separated by a conductor

**183. How many coulombs are delivered by a storage battery in 25**

hours if it is supplying current at the rate of 3 A?

hours if it is supplying current at the rate of 3 A?

**A. 2.592 x 105 C**

B.

2.592 x 103 C

C.

2.592 x 108 C

D.

2.592 x 1012 C

**184. When frequency of an ac wave decreases, the value of XL**

in a coil

in a coil

**A. Approaches zero**

B.

Gets larger positively

C.

Gets larger negatively

D.

Stays constant

**185. The temperature-resistance coefficient of pure gold is**

**A. 0.0034**

B.

0.0037

C.

0.0038

D.

0.0039

**186. The capacitor opposes any change in voltage across it by**

A.

Passing a voltage proportional to the rate of change of current

B.

Acting as a short circuit at time equal to zero

**C. Passing a current proportional to the rate of change of voltage**

D.

Acting as a short circuit at time equal to infinity

**187. What is the most common non-sinusoidal waveform?**

**A. Square wave**

B.

Triangular wave

C.

Trapezoidal wave

D.

Sawtooth wave

**188. Which of the following capacitors is suitable for dc filter**

circuits?

circuits?

A.

Mica

B.

Ceramic

C.

Paper

**D. Electrolytic**

**189. A series RL circuit has R of 10 Î© and XL of 5 Î©,**

its impedance in rectangular form is given by

its impedance in rectangular form is given by

**A. 10 + j 5 Î©**

B.

10 + j 10 Î©

C.

10 â€“ j 5 Î©

D.

10 â€“ j 10 Î©

**190. What is the reciprocal of capacitance?**

A.

Reluctance

B.

Susceptance

**C. Elastance**

D.

Conductance

**191. If the output resistance of a voltage source is 4 Î©, it**

internal resistance should be

internal resistance should be

**A. 4 Î©**

B.

8 Î©

C.

2 Î©

D.

Infinite

**192. The curve between current and frequency is termed as**

A.

Voltage curve

B.

Gain curve

C.

Power curve

**D. Resonance curve**

**193. What is the total effective capacitance of two 0.25 Î¼F**

capacitors connected in series?

capacitors connected in series?

**A. 0.125 Î¼F**

B.

1.25 Î¼F

C.

0.50 Î¼F

D.

2.5 if

**194. What can be used to estimate resonant frequency and to find**

reactance at any frequency for any value of capacitor or inductor?

reactance at any frequency for any value of capacitor or inductor?

A.

Smith chart

**B. Reactance chart**

C.

Impedance chart

D.

Resonance chart

**195. For a parallel AC circuit, ___ is used as a reference**

phasor.

phasor.

**A. Voltage**

B.

Power

C.

Current

D.

Resistance

**196. For a series AC circuit, ___ is not used as a reference**

phasor.

phasor.

**A. Voltage**

B.

Impedance

C.

Current

D.

Conductance

**197. If a certain circuit has a current that is lagging the**

voltage by 45Ëš, then it displays

voltage by 45Ëš, then it displays

A.

Pure inductive reactance

B.

Resistance and capacitance reactance

**C. Resistance and inductive reactance**

D.

Pure capacitive reactance

**198. What maximum voltage can be applied across the capacitor**

for very short period of time?

for very short period of time?

A.

Working voltage

**B. Surge voltage**

C.

Stray voltage

D.

Peak voltage

**199. What is expected when two 20 kÎ©, 1 watt resistor in**

parallel are use instead of one 10 kÎ©, 1 watt?

parallel are use instead of one 10 kÎ©, 1 watt?

A.

Provides higher current

B.

Provides less power

**C. Provides more power**

D.

Provides wider tolerance

**200. Which of the following materials has the lowest dielectric**

strength?

strength?

A.

Glass

**B. Paper**

C.

Mica

D.

Teflon

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