electrical electronic test mcq non calculation questions

7/23/2019 Electrical Electronic Test MCQ Non Calculation Questions

1/4

Training Electrical/Electronic Eng.

Pre-test

Select the appropriate answer for each

question. (MCQs)

1.

Which of the following is a derived

SI unit

a. Kelvin

b. Ampere

c. Metre

d. Joule

2.

Resistance: Ohm as

_______:________

a.

Inductance: Farad

b.

Capacitance: Henry

c.

Pressure: Pascal

d.

Power: Joule

3. The unit of magnetic flux is weber

a. True

b. False

4. 1 milli ampere is equal to ______

a. 1000 A

b. 0.001 A

c. 0.000001 A

d. 1000000 A

5.

The movement of _______ resultsin current flow

a. neutrons

b. electrons

c. protons

d. ions

6. 1 micro volt is

a. 0.001 V

b. 0.0001 V

c. 0.00001 V

d.

0.000001 V

7. ____________ is a semiconductor

a.

Neon

b.

Silicon

c.

Lithium

d.

Copper

8. The resistance of a conductor

varies

a.

inversely as its length ( l)

b. directly as its resistivity ( )

c. directly as its cross-sectional

area (A )

d. all of the above are correct.

9. In resistance colour coding brown

colour is assigned the value

a.

0

b.

1

c.

2

d. 3

10.

In the tolerance band of resistance

colour coding,silver represents the

tolerance of

a. 25%

b. 20%

c. 10%

d. 5%

11.

According to Ohms law:a. Voltage is inversely

proportional to current

b. Current is directly proportional

to resistance

c. The ratio of voltage and current

is a constant (R)

d. All of the above

12.Kirchhoffs current law is

applicable to only,a. Electronic circuit

b. Closed loop in the circuit

c. Junction in a circuit

d.

None of the above


2/4


Pre-test

13.Power factor will be leading for

a.

Inductive load

b.

Capacitive load

c. Resistance Load

d.

Any of the above14.The frequency of the supply

voltage in Ghana is 50 Hz. The

time period (T ) is

a. 0.02 s

b. 50 s

c. 1 s

d. 10 s

15.Fuses are rated in ________

a. ampere

b. ampere - hour

c. watt

d. kilowatt -hour

16.

The energy stored in a lead-acid

battery is in the form of

a.

Chemical energy

b.

Electrical energy

c.

Potential energy

d.

Solar energy

17.

Doped(impure) semiconductor is

also called________

a. Intrinsic semiconductor

b.

Extrinsic semiconductor

c.

Active semiconductor

d.

Any of the above

18.The emerging of a free electron and

a hole is known as_____

a. Recombination

b.

Absorptionc. Adsorption

d. Attraction

19.In electronics the term IC denotes:

a. Internal Combustion

b. Industrial Control

c. Internal Circuit

d. Integrated Circuit

20.The unit for electrical energy is

a.

Kilo-Watt- Hour (KWH)

b.

Watt (W)

c. Farad (F)

d.

Volts (V)21.Which equation for power is

incorrect

a. P VI

b. 2P I R

c.2

VP

I

d.2V

PR

22.

A material whose resistancedecreases with an increase in

temperature is said to have_

a. negative temperature

coefficient of resistance

b. positive temperature coefficient

of resistance

c. low temperature coefficient of

resistance

d.

high temperature coefficient of

resistance

23.

________ stores energy in its

magnetic field.

a.

Battery

b.

Inductor

c.

Capacitor

d. Transistor

24.The _______ value of an

alternating current or voltage is one

which has the same heating effect

value as that of the direct current or

voltage.

a. Peak

b. Average

c. Frequency

d. RMS


3/4


Pre-test

25.Power factor is equal to ______

a.True(active) power

Apparent power

b.

Apparent power

True(active) power

c.

Apparent power True(active)

power

d. Apparent power True(active)

power

26.

With an increase in system

frequencyinductive reactance , XL

a.

decreases

b.

increasesc. does not change

d. equals to zero

27.Which of these statements is

incorrectfor astarconnection

a. Has a common point called

neutral

b. Phase voltage (ph

V ) is equal to

line voltage ( LineV )

c.

Phase current ( phI )is equal to

line current ( LineI )

d. Phase voltage ( phV ) is not

equal to line voltage ( LineV )

28.The expression for the active

power drawn by a 3-phase

balanced system (load) is

a. 3 cosLine LineV I

b.

cosLine LineV I

c. cosLine LineV I

d.

3 cosLine LineV I

29.The opposition offered by magnetic

circuit to the establishment of a

magnetic flux is called

a.

Reluctance

b.

Flux density

c.

Resistance

d. Conductance

30.The machine which converts

electrical energy to mechanical

energy is called

a. Converter

b.

Motorc. Generator

d. Transformer

31.The transformer has a rotating part.

a. True

b. False

32.The commutator of a DC machine:

a. Converts AC emf and current

from armature coils to DC emf

and current.

b. Protects the armature winding

c. Starts the DC machine

d. Improves power factor

33.

The armature of a dc machine is

laminated to reduce

a.

Friction

b.

Copper losses

c.

Hysteresis Loss

d.

Eddy current loss

34.

The speed at which the rotating

magnetic field produced by stator

current rotates is

a.

Rotating speed

b.

Rotor speed

c.

Synchronous speed

d. Asynchronous speed

35.The purpose of the starter of a

motor is to

a.

Limit the starting currentb. Limit the speed

c. Produce back e.m.f

d. Protect against overvoltage

36.Transformers are rated in

a. KWH

b. KVA

c. KVAr

d.

KW


4/4


Pre-test

37.The principle of operation of a

transformer is based on

a.

Static induction

b. Self-induction

c.

Mutual inductiond. Dynamic induction

38.In a transformer, power is

transferred from the primary side to

the secondary side __

a. Magnetically

b. Electrically

c. Physically

d. None of the above answers is

correct

39.Fuses are provide in the Direct-On-

Line Stater to

a. Limit the supply voltage

b.

Limit the current

c. Reduce the starting current

d.

Provide short circuit protection

40.

_________converts DC to AC

a.

Inverter

b.

Rectifier

c.

Voltage regulator

d.

UPS

41.

The zener diode is used as

a. a rectifier

b. an amplifier

c. a voltage regulator

d.

an insulator42.A pn junction diodeis a_______

terminal device.

a. Two

b. Three

c. Four

d. One

43.The Bipolar Junction Transistor

(BJT) is a three-terminal device.

The terminals are:

a. Emitter, Drain and Gate

b.

Emitter, Drain and Basec. Emitter, Collector and Gate

d. Emitter, Collector and Base

44.The BJT is a_________

operated/controlled device.

a. current

b. voltage

c. current and voltage

d. none of the above

45.Silicon Controlled Rectifier (SCR)

is a three-terminal device. The

terminals are:

a. Anode, Cathode and Drain.

b.

Anode, Cathode and Gate.

c. Gate, Source and Drain.

d.

Gate, Collector and Emitter.

46.

A diode can conduct in only one

direction

a.

True

b.

False

47.For an ORgatethe output is high

(1)if any or all of the inputs are

high(1)

a.

True

b.

False

48.ForAND gatethe output is low(0)

if any or all inputs are low(0)

a. True

b.

false49.If any of the inputs to a NOR gate

is low (0), the output is low (0)

a. True

b. False

50.If all inputs to anExclusive OR

gate (XOR) is high the output is

low (0)

a. True

b. False

electrical electronic test mcq non calculation questions

Documents