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- Question
The v-i relation for an arc is v = 44 +
. If v = 50 V, i =
Options- A. 10 A
- B. 5 A
- C. 2 A
- D. 0.5 A
- Correct Answer
- 5 A
Explanation
.
Materials and Components problems
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- 1. A characteristic property of crystal is its periodicity of structure.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. The two conductors of a transmission line carry equal current I in opposite direction. The force on each conductor is
Options- A. proportional to I
- B. proportional to I2
- C. proportional to distance between the lines
- D. proportional to I3 Discuss
Correct Answer: proportional to I2
- 3. Specific resistance of silver is about
Options- A. 0.16 x 10-8 ?-m
- B. 1.64 x 10-8 ?-m
- C. 16 x 10-8 ?-m
- D. 164 x 10-8 ?-m Discuss
Correct Answer: 1.64 x 10-8 ?-m
- 4. Silicon and germanium have diamond structure. The number of atoms in a volume equal to a3 where a is the edge of elementary cube are
Options- A. 32
- B. 16
- C. 8
- D. 4 Discuss
Correct Answer: 8
- 5. Assertion (A): Holes are majority carriers in p type semiconductor.
Reason (R): In p type semiconductor, the electrons produced by thermal agitation recombine with holes.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
Correct Answer: Both A and R are true and R is correct explanation of A
- 6. Assertion (A): Electronic polarizability increases as atoms becomes larger.
Reason (R): For rare gas, ?0(?r - 1) E = Nae, where N is number of atoms/m3 and ae is electronic polarizability of material.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
Correct Answer: Both A and R are true but R is not correct explanation of A
- 7. On the basis of the type of chemical bonds, solids may be classified into
Options- A. ionic crystals
- B. ionic and valence crystals
- C. ionic crystal, valence crystals and metals
- D. ionic crystals, valence crystals, metal and vander wall crystals Discuss
Correct Answer: ionic crystals, valence crystals, metal and vander wall crystals
- 8. Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. Debye temperature of metals is
Options- A. about 10 K
- B. about 200 K
- C. about 600 K
- D. about 2 K Discuss
Correct Answer: about 200 K
- 10. A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.
Options- A. True
- B. False Discuss
Correct Answer: True
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