Electrical Engineering Quiz 21

1 / 50

**The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is______________? **

2 / 50

**A common-mode signal is applied to ________________? **

3 / 50

**The efficiency of two identical transformers under load conditions can be determined by_______________? **

4 / 50

**In a cable immediately above metallic sheath ______ is provided **

5 / 50

**The resistance of an ideal voltmeter is ______________? **

6 / 50

**For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor? **

7 / 50

**SI unit of the permittivity of free space is________________? **

8 / 50

**In a transistor ______________? **

9 / 50

**The sensitivity of a multimeter is given in _______________? **

10 / 50

**A hole in a semiconductor is defined as_________________? **

11 / 50

**The square root of the ratio of line impedance and shunt admittance is called the___________? **

12 / 50

**A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________? **

13 / 50

**In a capacitor start motor, the phase displacement between starting and running winding can be nearly__________? **

14 / 50

**Which of the following is the major consideration to evolve a good design ? **

15 / 50

**The speed of a superfast train is______________? **

16 / 50

**The Biot-savart?s law is a general modification of_______________? **

17 / 50

**The operating speed of a synchronous motor can be changed to new fixed value by___________? **

18 / 50

**Which of the following devices may be used for extending the range of instruments ? **

19 / 50

**Which one of the following can be taken as the measure of electric intensity ? **

20 / 50

**Short circuiting of a cell may be caused____________? **

21 / 50

**The transition temperature of mercury is____________? **

22 / 50

**A turbine is tripped when ? **

23 / 50

**A capacitor is generally a____________? **

24 / 50

**A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________? **

25 / 50

**By the use of which of the following, high frequency power supply for induction furnaces can be obtained ? **

26 / 50

**The speed of a D.C. shunt motor can be increased by_______________? **

27 / 50

**The speed of a D.C. series motor is_____________? **

28 / 50

**An ideal value of stability factor is________________? **

29 / 50

**Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________? **

30 / 50

**The hysteresis loss in a D.C. machine least depends on____________? **

31 / 50

**Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________? **

32 / 50

**A resonant circuit contains ____________elements? **

33 / 50

**The materil used to coat inside the face of CRT is ______________? **

34 / 50

**A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ? **

35 / 50

**In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________? **

36 / 50

**A fuse is connected_______________? **

37 / 50

**An SCR is sometimes called ____________? **

38 / 50

**Which of the following motors is preferred when quick speed reversal is the main consideration ? **

39 / 50

**In the case of a lossy capacitor, its series equivalent resistance value will be_______________? **

40 / 50

**The maximum speed variation in a 3-phase synchronous motor is____________? **

41 / 50

**Which quantity should be measured by the voltmeter ? **

42 / 50

**Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________? **

43 / 50

**One newton meter is same as_____________? **

44 / 50

**Millman?s theorem yields____________? **

45 / 50

**In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output **

46 / 50

**The voltage induced in an inductor is represented as, **

47 / 50

**Demand factor is defined as___________? **

48 / 50

**The maximum collector efficiency of class B operation is ________________? **

49 / 50

**Cylindrical windings using circular conductors, employed in transformers, are_____________? **

50 / 50

**The fuse rating is expressed in terms of_____________? **

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