RC Exam 1

Question 1

Which of the following dry cells has the largest height?

Answer 1

D

Question 2

What do you call the term in electronic measuring devices when a metal increases resistance due to heat produced by current flowing through them?

Answer 2

Positive Temperature Coefficient

Question 3

With a single decimal digit, the highest count possible is ____.

Answer 3

9

Question 4

What do you call the condition under which there is no power loss due to reflection at a source/load junction owing to the fact that the load impedance is conjugate of the source impedance?

Answer 4

Maximum Power Transfer

Question 5

What single device converts chemical energy into electrical energy?

Answer 5

Battery

Question 6

What is called back EMF?

Answer 6

A voltage that opposes the applied EMF.

Question 7

Ohm’s law is applicable to _______ circuit.

Answer 7

Linear

Question 8

What phenomenon whereby substance attracts pieces or iron?

Answer 8

Magnetism

Question 9

Parallel cells have the same voltages as one cell but have:

Answer 9

different current capacity

Question 10

What is the output voltage of a carbon-zinc cell?

Answer 10

1.5 V

Question 11

Window comparator requires how many op-amps?

Answer 11

2

Question 12

How does an ohmmeter behave if its positive lead is connected to cathode of a diode while negative to anode?

Answer 12

Has infinite high resistance

Question 13

What do you call individual points in graphic displays?

Answer 13

Pixels

Question 14

What electronic component is a non-linear resistor and its resistance is a function of the voltage cross it?

Answer 14

Varistor

Question 15

The relative permeability of paramagnetic substance is ______.

Answer 15

A little greater than 1

Question 16

A two-pole, three-phase motor has_______ field poles

Answer 16

2

Question 17

Dynamic memory stores information:

Answer 17

as long as power is applied and the memory is refreshed

Question 18

What transistor in which n-type and p-type materials are used?

Answer 18

BJT

Question 19

One disadvantage of a dynamic RAM is a result of the need for:

Answer 19

Refreshing

Question 20

What term is used to describe bias condition of a device or circuit where no current can flow?

Answer 20

Cut-off

Question 21

What is the program used to enter a program into the computer memory?

Answer 21

Loader

Question 22

Find the magnetomotive force of a circuit having 10 V across a relay with 50 turns and of 25 ohms resistance.

Answer 22

20 A.t.

mmf =NI
mmf =N (V/R)
mmf= (50) (10/25
mmf =20 A.t. -> Ans.

Question 23

What term refers to the energy stored in an electromagnetic or electrostatic field?

Answer 23

Potential energy

Question 24

What concept whereby a small voltage is generated by a conductor with current in an external magnetic field?

Answer 24

Hall effect

Question 25

Electric power refers to:

Answer 25

Volt-Ampere P=VI

Question 26

Identify from the following statements that does not refer to the use of signal generator when testing a receiver out of generating either modulated or unmodulated signal.

Answer 26

Display of voltage or current graphs

Question 27

What is the output voltage of a silver cadmium cell?

Answer 27

1.1 V

Question 28

Materials with permeabilities slightly less than that of free space are referred to as _______.

Answer 28

Diamagnetic

Question 29

Which are the three terminals of a bipolar transistor?

Answer 29

Base, Collector, Emitter

Question 30

A conductor behaves as _______ at absolute zero temperature

Answer 30

Super Conductor

Question 31

Which of logic families below is noted for low power consumption

Answer 31

I²L

Question 32

What is a thin layer in a PCB which is firmly bounded to an insulating base material?

Answer 32

Substrate

Question 33

What counter follows the binary sequence?

Answer 33

Binary Counter

Question 34

What is the logic circuit having two or more inputs but only one output, with high output if any or all inputs are high, with low output only when all inputs are low?

Answer 34

OR Gate

Question 35

What law whereby the attraction or repulsion between two magnetic poles is directly proportional to their strengths?

Answer 35

Coulomb’s First Law

Question 36

Which item is not a storage device?

Answer 36

Card Reader

Question 37

When an impurity having five electrons in the outer shell is added to the intrinsic semiconductor, it is called a/an ____.

Answer 37

Donor atom

Question 38

What is known as the reciprocal of capacitance?

Answer 38

Elastance

Question 39

What are the hardware data entry and exit points of a microcomputer?

Answer 39

Ports

Question 40

What is the unit of the reciprocal of capacitance in electronics?

Answer 40

Daraf

Question 41

What do you call the process of converting an AC input to a DC output?

Answer 41

Rectification

Question 42

A half-adder can be constructed using:

Answer 42

Both Exclusive OR gate and AND gate

Question 43

What oscillator operates on the principle of velocity modulation and changing speed of electron passing through the tube?

Answer 43

Klystron

Question 44

A zener diode is connected so that:

Answer 44

Both the cathode is positive with respect to the anode and it is reversed bias

Question 45

What is the process used to describe analog-to-digital conversion?

Answer 45

Digitize

Question 46

Which materials have more free electrons?

Answer 46

Conductors

Question 47

Determine how long a battery will last whose rating is 100 Ah; 24 volts and will run a 300 watts electronic equipment and 50 watts light.

Answer 47

6.85 hours I = P/V I = (300W + 50W)/24 V I = 14.58A Battery Life = 100Ah/14.58A Battery Life = 6.85 hours

Question 48

Resistor noise is classified as ______ noise.

Answer 48

White

Question 49

Comparing a vacuum tube diode and a germanium diode, the latter:

Answer 49

cannot be used with as high PIV

Question 50

Which of the following equipment is used to determine location in terms of coordinate, this is now widely used in modern communications?

Answer 50

Global Positioning System (GPS)