Interferometer - Mechanical Engineering (MCQ) questions and answers

1)   What does N, P and L mean in N.P.L. Gauge interferometer?  

a. Nikon pulsed laser
b. Nuclear plasma laboratory
c. National Physics Laboratory
d. Nuclear physics laboratory
Answer  Explanation 

ANSWER: National Physics Laboratory

Explanation:
No explanation is available for this question!
2)   Which type of fringe is formed, if a path difference of  λ/2 is observed in an interference pattern?

a. Dark fringe
b. Bright fringe
c. Both bright and dark fringe overlap
d. Unpredictable
Answer  Explanation 

ANSWER: Dark fringe

Explanation:
No explanation is available for this question!
3)   At which angle does a glass plate reflector set in N.P.L. interferometer?

a. 30o
b. 45o
c. 60o
d. 90o
Answer  Explanation 

ANSWER: 45o

Explanation:
No explanation is available for this question!
4)   A surface of 2.1 mm is to be measured using a interferometer. Calculate nominal fraction for blue light which has wavelength of 0.785 μm.

a. 0.8280
b. 0.5350
c. 0.3185
d. 0.1910
Answer  Explanation 

ANSWER: 0.3185

Explanation:
No explanation is available for this question!
5)   An interferometer is used to measure a surface of 1.85 mm. Calculate number of fringes, when λ = 0.659 μm.

a. 5614.567
b. 5000.236
c. 2807.283
d. None of the above
Answer  Explanation 

ANSWER: 5614.567

Explanation:
No explanation is available for this question!
6)   Which type of surface, has a fringe pattern shown below?

a. Sphere
b. Cylinder
c. Conical
d. Spheroid
Answer  Explanation 

ANSWER: Spheroid

Explanation:
No explanation is available for this question!
7)   Which among the following is used to create fringes in N.P.L. interferometer?

a. Condensing lens
b. Collimating lens
c. Optical flat
d. All of the above
Answer  Explanation 

ANSWER: Optical flat

Explanation:
No explanation is available for this question!
8)   Which type of light source is used in N.P.L. type of flatness interferometer?

a. Mercury vapour lamp
b. Cadmium lamp
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Mercury vapour lamp

Explanation:
No explanation is available for this question!
9)   Which type of surface in a fringe pattern exhibits the movement of fringes towards the centre?

a. concave surface
b. convex surface


Answer  Explanation 

ANSWER: concave surface

Explanation:
No explanation is available for this question!
10)   What does the following interference band pattern indicate?

a. Gauge has taper along its large edge
b. Gauge has taper along its short corner
c. Flat gauge
d. Bands have same direction but the pitch is different
Answer  Explanation 

ANSWER: Gauge has taper along its short corner

Explanation:
No explanation is available for this question!
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