electronics MCQ Objective solved questions for IES

electronics MCQ Objective solved questions for IES
Electronics engineering objective type questions
Solved Multiple Choice Questions Electronics engineering For SAIL GAIL ONGC IES
Engg Multiple Choice Questions: IES ELECTRONICS

1 Selenium photo cells are sensitive to the visible spectrum of
a) 400 – 700 mµ
b) 350 – 700 mµ
c) 300 – 700 mµ
d) 450 – 700 mµ
Ans : (c)


2 Respiratory volume is measured using
a) Myograph
b) Pneumograph
c) Spiro meter
d) Goniometer
Ans : (b)

3. Match the following
1. Sensitivity A. Ability to detect very small change
2. Stability B. Ability to produce constant output
3. Precision C. Measure of reproducibility
4. Accuracy D. Closeness to true value
a) 1- B, 2 - A, 3 - C, 4 - D
b) 1 - B, 2 - A, 3 - D, 4 - C
c) 1- C, 2 - A, 3 - B, 4 - D
d) 1 - A, 2 - B, 3 - C, 4 - D
Ans : (d)
4. Piezo electric materials have ___________ resistivity
a) Zero
b) Infinite
c) Finite
d) Null
Ans : (c)
5Dummy gauge is mounted on the opposite arm of the active gauge to cancel output differentials due to
a) Temperature variation of resistance
b) Pressure variation of resistance
c) pH concentration variation
d) Change in blood flow
Ans : (a)

6. For fiber optic sensors,
a) Single mode transmission is used
b) Multimode transmission is used
c) Both single mode and multimode transmission is used
d) Transmission is not used

Ans (a)

7 One of the combination of materials used for optical fibers are ___________
a) Copper core and glass cladding
b) Glass core and aluminum cladding
c) Glass core and plastic cladding
d) Plastic core and glass cladding
Ans (c)

8 The optical sensors may be classified as _________
a) Intensity and intrinsic types
b) Interferometric and extrinsic types
c) Intensity or intrinsic type and Interferometric or extrinsic types
d) Only extrinsic type
Ans (c)






9.The gauge factor is given as
a) ∆R/R
∆I/I
b) ∆I/I
∆R/R
c) ∆R/R
∆D/D
d) ∆D/D
∆R/R
Ans : (a)

10. The gauge factor G and the poisons ratio µ are related as
a) G = 1+µ
b) G = µ
c) G = 1+2µ
d) G = 1+µ /2
Ans : (a)


11. In variable capacitance transducer, C=
a) kξo/Ad
b) kξoA/d
c) kξod/A
d) Aξo/kd
Ans : (b)



12. Inductance of a coil is given by L =
a) N2R
b) N2 + R
c) N2 - R
d) N2 / R
Ans : (d)





13 ______________ is called as linistor when it provides a linear change in resistance with respect to temperature
a) Thermistor
b) Thermocouple
c) Thermometer
d) Thermo resistive transducer
Ans : (a)


14.. An operational amplifier is a
S1: Direct coupled high gain amplifier
S2: Device to perform linear operation
a) S1 is true & S2 is false
b) S2 is true & S1 is false
c) Both S1 & S2 are true
d) Both S1 & S2 are false
Ans : (c)

15. The input impedance of the operational amplifier is
a) Infinite
b) Zero
c) Very high but not infinite
d) Very small
Ans : (c)

16. Power supply rejection ratio of an OPAMP should be
a) Ideally unity
b) Zero
c) As small as possible
d) As large as possible
Ans : (d)




17. The ideal value of CMRR is
a) 1
b) 0
c) -∞
d) ∞
Ans : (d)

18. To get very high input impedance ________________ is also used as an isolation amplifier.
a) Boost strapping circuit
b) Darlington pair
c) Push pull circuit
d) Emitter follower
Ans : (a)

19. Carrier amplifiers are characterized by
a) Low gain
b) Medium gain
c) High gain
d) Drift
Ans : (c)

20. DC amplifiers are generally
S1: Negative feedback type
S2: Positive feedback type
a) S1 is true & S2 is false
b) S2 is true & S1 is false
c) Both S1 & S2 are true
d) Both S1 & S2 are false
Ans : (a)

21. Isolation amplifiers are commonly used for providing protection against
a) Grounding
b) Leakage currents
c) Stray field
d) Shock

Ans : (b)
22 __________is the recording of the bio potentials generated by the movement of the eye ball.
a) Electro oculograph
b) Electro retinograph
c) Apexcardiograph
d) Ballistograph
Ans : (b)




23. The heart sounds are recorded by
a) Electrocardiography
b) Endoscope
c) Phono cardiograph
d) Angio cardiograph
Ans : (c)

24.. Type of laser used in photo chemical process is
a) CO2
b) Nd-YAG
c) He-Ne
d) Excimer lasers
Ans : (c)

25.. MRI makes use of the _____ region of the electromagnetic spectra to provide an image.
a) Ultra Violet
b) Radio Frequency
c) Infra Red
d) Ultra High frequency
Ans : (b)

26.. (A) Spin Density – (1) Signal is proportional to no. of nuclei present
(B) Spin lattice – (2) Longitudinal relaxation time
(C)Spin-spin – (3) Transverse relaxation time
a) A-1, B-2, C-3
b) A-2,B-3,C-1
c) A-3,B-1,C-2
d) A-2,B-1,C-3
Ans : (a)

27.. (A) A mode – (1) Reflected echoes are depicted as dots
(B) B mode – (2) unidirectional graphic representation
(C)M /T-M mode – (3) Reflected echoes are depicted as vertical spikes
a) A-1, B-2, C-3
b) A-2,B-3,C-1
c) A-3,B-1,C-2
d) A-2,B-1,C-3
Ans : (c)





28.. Ultra sound is a form of energy which consists of
S1: Mechanical vibrations of high frequency
S2: Elecrical vibrations of high frequency
a) S1 is true
b) S2 is true
c) S1 and S2 are true
d) S1 and S2 are false
Ans : (a)

29.. CT scanner is highly helpful in
a) Bone tumours
b) Thorax scanning
c) Neck scanning
d) Brain scanning
Ans : (d)

30. The first medical application of LASER was in
a) Gastrology
b) Bronchoscopy
c) Opthalmology
d) Cardiography
Ans : (c)

31. In D.C. defibrillator, a pulse width of 5 to 10 msec duration is generated by means of
a) Astable multivibrator
b) Monostable multivibrator
c) IC 555
d) Capacitor discharge
Ans : (d)

32.. Micro shock may occur due to flow of
a) 1 ampere current across body surface
b) Few milli ampere current across the cardiac muscles
c) 5 milli ampere current across the body surface for 1 minute
d) 5 milli ampere current across the body surface
Ans : (b)

33. The use of super conducting magnets in MRI is to obtain
a) Signals from surface tissue
b) High R.F. field
c) High strength gradient fields
d) High strength magnetic fields
Ans ; (d)