Explore topic-wise MCQs in Mechanical Engineering.

This section includes 346 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.

151.

The register that may be used as an operand register is

A. accumulator
B. b register
C. data register
D. accumulator and b register
Answer» E.
Discussion
152.

How many coils are required to make LVDT?

A. 4
B. 6
C. 3
D. 2
Answer» D. 2
Discussion
153.

The type of sensor that detects the analyte species directly through their characteristic spectral properties is called

A. chemical sensor
B. thermal sensor
C. light sensor
D. spectroscopic sensors
Answer» E.
Discussion
154.

On the bases of application of optic fiber sensor, which of the following is not considered to be the classification of fiber optic sensor?

A. biomedical/photometric sensors
B. physical sensors
C. thermal sensors
D. chemical sensors
Answer» D. chemical sensors
Discussion
155.

In which of the following optic fiber sensor the fiber is simply used to carry light to and from an external optical device where the sensing takes place?

A. extrinsic fiber optic sensor
B. energized fiber optic sensor
C. all fibers are used to simply carry light to and from the external optical devices
D. intrinsic fiber optic sensor
Answer» B. energized fiber optic sensor
Discussion
156.

Optical fiber sensors are not immune to electromagnetic disturbances.

A. true
B. false
Answer» C.
Discussion
157.

Optical fiber sensors are electrically

A. active
B. passive
C. active as well as passive
D. cannot be determined
Answer» C. active as well as passive
Discussion
158.

Optical fibers are not immune to

A. electronic disturbances
B. magnetic disturbances
C. ambient light interference
D. electromagnetic disturbances
Answer» D. electromagnetic disturbances
Discussion
159.

Which sensor is linear and low accuracy?

A. thermistor
B. resistance thermometer
C. thermocouple
D. semiconductor based sensor
Answer» E.
Discussion
160.

Which type of temperature sensor is placed in Integrated Circuits?

A. thermistor
B. resistance thermometer
C. thermocouple
D. semiconductor based sensor
Answer» E.
Discussion
161.

                 consists of two different metals connected at two points.

A. thermistor
B. resistance thermometer
C. thermocouple
D. semiconductor based sensor
Answer» D. semiconductor based sensor
Discussion
162.

                 measures temperature by correlating the resistance of the RTD with temperature.

A. thermistor
B. resistance thermometer
C. thermo couple
D. semiconductor based sensor
Answer» C. thermo couple
Discussion
163.

A                  is thermally sensitive resistor that exhibits a large change in resistance.

A. thermistor
B. resistance thermometer
C. thermo couple
D. semiconductor based sensor
Answer» B. resistance thermometer
Discussion
164.

Line of sight of wireless sensor tag is

A. 750ft
B. 700ft
C. 500ft
D. 550ft
Answer» C. 500ft
Discussion
165.

What is STSC1?

A. pressure sensor
B. temperature sensor
C. touch sensor
D. humidity sensor
Answer» C. touch sensor
Discussion
166.

What is DS18B20?

A. pressure sensor
B. touch sensor
C. humidity sensor
D. temperature sensor
Answer» E.
Discussion
167.

Electric motor protection has which sensor?

A. pressure sensor
B. touch sensor
C. temperature sensor
D. humidity sensor
Answer» D. humidity sensor
Discussion
168.

Which sensor is used for monitor electric distribution and switching equipment temperature?

A. lm35
B. esp8266
C. dht11
D. rfm3200
Answer» E.
Discussion
169.

Which of the following is the Wireless battery-free sensor?

A. lm35
B. rfm3200
C. esp8266
D. dht11
Answer» C. esp8266
Discussion
170.

Monnit temperature sensor is used for what?

A. accurate results
B. to measure the temperature at high degree
C. temperature sensor
D. pressure sensor
Answer» B. to measure the temperature at high degree
Discussion
171.

How many pins does temperature sensor have?

A. 5 legs
B. 2 legs
C. 4 legs
D. 3 legs
Answer» E.
Discussion
172.

which sensor is LM35?

A. pressure sensor
B. humidity sensor
C. temperature sensor
D. touch sensor
Answer» D. touch sensor
Discussion
173.

What is ESP8266?

A. wifi module
B. sensor
C. board
D. usb cable
Answer» B. sensor
Discussion
174.

Hall Effect transducer can be used to measure

A. magnetic field
B. angular displacement
C. linear displacement
D. all of the mentioned
Answer» E.
Discussion
175.

Hall Effect transducers attain equilibrium instantaneously.

A. true
B. false
Answer» C.
Discussion
176.

Which of the following represents the output of Hall Effect transducer?

A. hall potential
B. emf
C. applied voltage
D. lorentz voltage
Answer» B. emf
Discussion
177.

Which of the following represents correct expression for Lorentz force?

A. bev
B. bv
C. ev
D. b
Answer» B. bv
Discussion
178.

Force exerted by magnetic field in Hall Effect transducers is

A. lorentz force
B. hall effect force
C. magnetic force
D. electric force
Answer» B. hall effect force
Discussion
179.

Hall Effect is clearly visible in

A. pure conductors
B. semiconductors
C. super conductors
D. metals
Answer» C. super conductors
Discussion
180.

Hall potential is inversely proportional to magnetic flux density.

A. true
B. false
Answer» C.
Discussion
181.

Which of the following represents the correct expression of Lorentz force?

A. eh/b
B. eeh/b
C. eeh
D. none of the mentioned
Answer» C. eeh
Discussion
182.

Hall Effect is a/an

A. electronic
B. magnetic
C. galvanic
D. ionizing
Answer» D. ionizing
Discussion
183.

Ultrasonic testing is destructive testing?

A. true
B. false
Answer» C.
Discussion
184.

The object under inspection must have parallel surfaces.

A. true
B. false
Answer» B. false
Discussion
185.

What is a type of piezoelectric crystal?

A. natural
B. normal
C. angle
D. transverse
Answer» B. normal
Discussion
186.

Which of the following is the best transmitter of sound?

A. oil
B. aluminum
C. steel
D. copper
Answer» D. copper
Discussion
187.

What is the drawback of ultrasonic testing?

A. low depth
B. high sensitivity
C. shape restriction
D. higher errors
Answer» C. shape restriction
Discussion
188.

Which of the following is the poorest transmitter of sound?

A. oil
B. water
C. air
D. copper
Answer» D. copper
Discussion
189.

What is acoustic impedance (in MPa s/m) of aluminum?

A. 1.58
B. 45.72
C. 16.77
D. 41.08
Answer» D. 41.08
Discussion
190.

Standard penetration depth varies from material to material.

A. true
B. false
Answer» B. false
Discussion
191.

ECI is only used for ferromagnetic materials.

A. true
B. false
Answer» C.
Discussion
192.

What is the reason for the limitation of depth below 6mm in ECI?

A. surface coating
B. electron hole pair generation
C. skin effect
D. residual stresses
Answer» D. residual stresses
Discussion
193.

The total resistance of the coil of ECI is known as

A. impedance
B. inductance
C. reactance
D. capacitance
Answer» B. inductance
Discussion
194.

ECI is generally restricted to a depth below

A. 1µm
B. 1mm
C. 2mm
D. 6mm
Answer» E.
Discussion
195.

What principle defines eddy current inspection (ECI)?

A. lenz law
B. biot-savart law
C. electromagnetic induction principle
D. faraday’s law
Answer» D. faraday’s law
Discussion
196.

Proper bonding causes errors in strain gauges.

A. true
B. false
Answer» C.
Discussion
197.

Proper functioning of a strain gauge depends on

A. strain
B. stress
C. bonding
D. length of wire
Answer» D. length of wire
Discussion
198.

Cement is classified under

A. 4 types
B. 2 types
C. 6 types
D. 8 types
Answer» C. 6 types
Discussion
199.

Bonding element in a strain gauge must have

A. zero insulation resistance
B. low insulation resistance
C. high insulation resistance
D. infinite insulation resistance
Answer» D. infinite insulation resistance
Discussion
200.

Commonly used elements for wire strain gauges are

A. nickel and copper
B. nickel and gold
C. gold and brass
D. silver and aluminium
Answer» B. nickel and gold
Discussion