Electrical Engineering Quiz 57

1 / 50

**An ideal switch is___________? **

2 / 50

**A common method of cooling a power transformer is_______________? **

3 / 50

**A NAND gate is called a universal logic element because______________? **

4 / 50

**The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________? **

5 / 50

**The best frequency response is of_____________coupling? **

6 / 50

**The pinch-off voltage in a JFET is analogous to _____________ voltage in a vacuum tube? **

7 / 50

**A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________? **

8 / 50

**Interpole flux should be sufficient to_____________? **

9 / 50

**In a D.C. generator the ripples in the direct e.m.f. generated are reduced by_____________? **

10 / 50

**By which of the following a bus-bar is rated? **

11 / 50

**Which of the following motors one will choose to drive the rotary compressor ? **

12 / 50

**The efficiency of an induction motor can be expected to be nearly____________? **

13 / 50

**In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________? **

14 / 50

**A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because? **

15 / 50

**On which of the following factors the number of phases for which a rectifier should be designed depend ? **

16 / 50

**The operating voltage of extra high tension cables is upto_______________? **

17 / 50

**A thermal protection switch can protect against_____________? **

18 / 50

**A transmission line is protected by_____________? **

19 / 50

**The effect of increasing the load on a synchronous motor running with normal excitation is to___________? **

20 / 50

**The time constant of a series R-C circuit is given by____________? **

21 / 50

**Torque developed by a single phase induction motor at starting is_____________? **

22 / 50

**The capacity of large turbo-generators varies from___________? **

23 / 50

**Number of tappings for each equalizer ring is equal to_____________? **

24 / 50

**Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________? **

25 / 50

**Permeance is the reciprocal of______________? **

26 / 50

**The circle diagram for an induction motor cannot be used to determine____________? **

27 / 50

**Which of the following test can be performed on DC series motor? **

28 / 50

**Which of the following materials has a negative temperature co-efficient of resistance? **

29 / 50

**The no load current in a transformer lags behind the applied voltage by an angle of about_____________? **

30 / 50

**Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is________________? **

31 / 50

**4 thyristors rated 200 V in series. The operating voltage of the string is 600 V. Derating factor of the string is_____________________? **

32 / 50

**Time constant of an inductive circuit___________? **

33 / 50

**In two part tariff, variation in load factor will affect____________? **

34 / 50

**D.C. windings are____________? **

35 / 50

**Commercial power supplies have voltage regulation ______________? **

36 / 50

**Efficiency of a power transformer is of the order of________________? **

37 / 50

**Each cell has a vent cap________? **

38 / 50

**Operating torques in analogue instruments are_______________? **

39 / 50

**For V-curves for a synchronous motor the graph is drawn between:_______________? **

40 / 50

**A JFET is a__________ driven device? **

41 / 50

**The purpose of d.c. conditions in a transistor is to___________________? **

42 / 50

**The main factor which leads to unstable parallel operation of flat and over compounded generators is_____________? **

43 / 50

**If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________? **

44 / 50

**A steam power stations basically work on the______________? **

45 / 50

**In over compounded generator, full load terminal voltage is______________? **

46 / 50

**The pointer of an indicating instrument should be______________? **

47 / 50

**If an instrument has cramped scale for larger values, then it follows________________? **

48 / 50

**Which of the following generating machine will offer constant voltage on all loads? **

49 / 50

**For the same H.P. rating and full load speed, following motor has poor starting torque_____________? **

50 / 50

**Charging of sulfated battery produces _________ heat **

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