REM B LVL 3

Question 1

In this voltage multiplier, measuring
from the top of the transformer winding will provide ___ multiples of Vm at the output, whereas measuring the output voltage from the bottom of the transformer will provide ___ multiples of the peak Vm.

(REM ELEX B LEVEL 3 FIGURE)

A. even, even
B. odd, even
C. odd, odd
D. even, odd

Answer 1

B. odd, even

Question 2

Which diode arrangement will supply a
positive output voltage?

(REM ELEX B LEVEL 3 FIGURE)

A. a
B. b
C. d
D. c

Answer 2

A. a

Question 3

Refer to the figure given below. The probable trouble, if any, indicated by these voltages is

(REM ELEX B LEVEL 3 FIGURE)

A. a diode is shorted.
B. the filter capacitor is shorted.
C. an open transformer secondary.

Answer 3

B. the filter capacitor is shorted.

Question 4

The most practical way of obtaining a
uniform distribution of series connected
SCRs is to

A. connect a resistor of value R in parallel
with one of the series connected SCRs
B. connect a resistor of value R in parallel
with each of the series connected SCRs
C. connect a resistor of value R in series with
one of the series connected SCRs

Answer 4

B. connect a resistor of value R in parallel
with each of the series connected SCRs

For uniform distribution of voltage
across series connected SCRs, a
resistor of value R in parallel with each
series connected SCR.

Question 5

How do fiber optic sensors measure physical parameters like temperature and pressure?

A. By measuring light signal variations
B. Through electrical resistance
C. By emitting ultrasonic waves

Answer 5

A. By measuring light signal variations

Question 6

What is the main principle behind
photovoltaic cells?

A. Conversion of electrical energy into light
energy
B. Conversion of light energy into
electrical energy through the
photovoltaic effect
C. Conversion of mechanical energy into
electrical energy

Answer 6

B. Conversion of light energy into
electrical energy through the
photovoltaic effect

Question 7

What property do acousto-optic
modulators use to alter the direction
and intensity of light?

A. Diffraction grating
B. Acoustic waves
C. Refraction

Answer 7

B. Acoustic waves

Question 8

What is the main principle behind the
operation of Lidar sensors?

A. Radio frequency signals
B. Laser light pulses
C. Infrared heat emission

Answer 8

B. Laser light pulses

Question 9

For lower accuracies.

A. digital acquisition system is used
B. both digital and analog acquisition systems are used
C. mechanical data acquisition system is
used
D. analog acquisition system is used

Answer 9

D. analog acquisition system is used

When low values of accuracy is
required, analog data acquisition
system is used. This includes a wide
frequency bandwidth as well.

Question 10

In which state of chemical substances
does a chemical sensing device work?

A. Plasma
B. Vapour
C. Solid

Answer 10

B. Vapour

The chemical sensors detect the
chemicals in the vapour form. Most of the chemical sensor are in the form of gas sensors. These sensors are widely used in industries to detect any gas
leakage or for automatic fire alarms.

Question 11

What is the main function of auxiliary
equipment?

A. non-linear response
B. linear response
C. unit step response

Answer 11

B. linear response

The typical functions of auxiliary
equipments include linearization and
limit compression for the input signals.
Individual instruments or a digital
computer is used to perform these
functions.

Question 12

Digital acquisition systems are used
when ___

A. bandwidth is zero
B. bandwidth is high
C. bandwidth is low

Answer 12

C. bandwidth is low

When the bandwidth required is low,
usually digital acquisition systems are made use of. For higher accuracy and lower per channel cost, digital data
acquisition systems are used.

Question 13

On ladder diagram, contacts in a horizontal rung, that is, contacts in series, represent the_

A. Logical OR operations
B. Logical NOR operations
C. Logical NOT operations
D. Logical AND operations

Answer 13

D. Logical AND operations

Question 14

Alternative paths provided by vertical paths from the main rung of a ladder diagram that is, path in parallel, represent ___

A. Logical AND operations
B. Logical OR operations
C. Logical NOR operations

Answer 14

B. Logical OR operations

Question 15

EQU, LES, LEQ instructions are
examples of which of the following
instructions?

A. Data handling instructions
B. Sequencer instructions
C. Comparison instruction

Answer 15

C. Comparison instruction

Question 16

In ladder logic programming, an
alternative in place of using same
internal relay contact for every rung is to
use ___

A. Master control relay
B. Dummy relay
C. One-shot operation

Answer 16

A. Master control relay

Question 17

A device that uses a projected beam of
light to detect smoke across large areas

A. Addressable Device
B. Beam Detector
C. Annunciator

Answer 17

B. Beam Detector

Question 18

Which of the following can trigger an
alarm or recording in Video Surveillance
Systems?

A. Access cards
B. Biometric readers
C. Smoke detectors
D. Motion detectors

Answer 18

D. Motion detectors

Question 19

What is the main advantage of using shielded cable in structured cabling systems?

A. It is cheaper than unshielded cable
B. It provides better electrical performance
C. It provides better protection against
electromagnetic interference (EMI)

Answer 19

C. It provides better protection against
electromagnetic interference (EMI)

Question 20

What type of connector is commonly
used for terminating twisted pair cable
in structured cabling systems?

A. RJ-45 connector
B. SC connector
C. BNC connector
D. ST connector

Answer 20

A. RJ-45 connector

Question 21

What is the most common physical
layer used for Modbus communication?

A. RS-485
B. USB
C. RS-232

Answer 21

A. RS-485

Question 22

Smoke detector sensitivity shall be
checked within ___ year/years after
installation.

A. Four
B. One
C. Three
D. Two

Answer 22

B. One