The input impedance of a JFET is _____________that of an ordinary transistor?

Related Mcqs:

1. The action of electromagnetic machines can be related to which of the following basic principles __________?

   A. Induction B. Interaction C. Alignment D. All of the above...

2. Materials exhibiting zero value of resistivity are known as ____________ ?

   A. conductors B. semiconductors C. insulators D. superconductors...

3. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto_______________?

   A. 10 MW B. 30 MW C. 60 MW D. 150 MW...

4. Which of the following is an advantage of hydrogen cooling ?

   A. Increase in efficiency B. Increase in ratings C. Increase in life D. Smaller size of coolers E. All of the above...

5. By which of the following methods motor rating for variable load drives can be determined ?

   A. Method of average losses B. Equivalent current method C. Equivalent torque method D. Equivalent power method E. All of the above...

6. ____________are used for construction of core of electromagnets?

   A. Soft magnetic materials B. Hard magnetic materials C. Either A. or B. D. None of the above...

7. In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?

   A. increase B. decrease C. either of the above D. none of the above...

8. The stator of a D.C. machine comprises of_____________?

   A. main poles B. interpoles C. frame D. all of the above...

9. ___________ brushes are fragile and cause excessive wear of commutator?

   A. Natural graphite B. Hard carbon C. Electro graphitic D. Metal graphite...

10. The forced oil and air circulation method is usual one for transformers of capacities____________?

    A. upto 5 MVA B. upto 10 MVA C. upto 20 MVA D. 30 MVA upwards...