25. In high voltage transmission lines the top most conductor is
A. R-phase conductor
B. Y- phase conductor
C. B-phase conductor
D. Earth conductor.
26. The number of cycles in which a high speed circuit breaker can complete its operation is
A. 3 to 8
B. 10 to 18
C. 20 to 30
D. 40 to 50
27. The letter D.P.D.T Identify a
A. Conduct
B. switch
C. thick wire
D. fuse
28. Which of the following is a product of root mean square (rms) value of applied voltage and current?
A. Reactive power
B. Virtual power
C. Active power
D. Apparent power
29. The p.f in inductive reactance of ckt is called
A. P.F
B. Active factor
C. Reactive factor
D. Apparent factor
30. The power which is actually dissipated in resistor is called
A. Reactive power
B. Virtual power
C. Active power
D. Apparent power
31. A Circuit of zero lagging power factor behaves as:
A. An inductive circuit
B. A capacitive circuit
C. R-L circuit
D. R-C circuit
32. The power factor is reciprocal to:
A. Inductive factor
B. Gain factor
C. Q-Factor
D. Inductive factor
33. The DC operating point of an amplifier specified by the voltage and the current value is called
A. Q point
B. Load line
C. Gain
D. None of above
34. The faraday law determine ——— of induced EMF (Magnitude)
35. The element with valence electrons in higher energy level as compared to silicon
A. Germanium
B. Arsenic
C. Copper
D. Carbon
35. The ordinary efficiency of a given transformer is maximum when
A. it runs at half full-load
B. it runs at full-load
C. its Cu loss equals iron loss
D. it runs slightly overload.
36. FETs are beneficial due to
A. Noise Immunity
B. Less size
C.
D. All of the above
37. Drawback of JFET (Lower Gain Bandwidth product)
38. The Main Difference between D Mosfet and Jfet is an absence of
A. PN Junction
B. Drain
C. Gate
D. Source
39. Vce of a transistor is used to check the transistor working in
A. saturation
B. cut off
C. defective
D. All of the above
40. ————— is based on heating effects of current?
A. Hot wire instrument
B. Megger
C. Wattmeter
D. Voltmeter
41. Benefit of hot wire instrument? (Answer was Option B according to NTS key)
42. Drawback of hot wire instrument? (Answer was Option C according to NTS key)
43. Open loop Amp Av=? Infinity
44. Oscillator whose frequency can be changed by a variable DC control voltage is?
A. Triangular-wave oscillator
B. Wien bridge oscillator
C. Crystal oscillator
D. Voltage control oscillator
45. In RLC, at low frequency Z is large because,
A. Xc large
B. Xl large
C. Xc small
D. Xl small
46. ———- waves produce when E.F couple with M.F (Electromagnetic)
47. A fetch cycle is
A. 1st part
B. 2nd part
C. intermediate
D. auxiliary
48. Sequence of component in FM receiver?
49. Synchronization of all base channels is done by?
A. FDMA
B. CDMA
C. SDMA
D. TDMA
50. Leakage current in transistor due to minority carriers is (Reverse leakage current)
51. Like electric charge, there are no magnetic charges in a magnetic field. This statement refers to?