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Electrical Engineering Quiz 12

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Electrical Engineering Quiz 12

1 / 50

An alternating current or voltage________________?

2 / 50

____________is the reserved generating capacity available for service under emergency conditions which is not kept in operation but in working order.

3 / 50

Which of the following motors can be run on AC as well as D.C. supply ?

4 / 50

If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?

5 / 50

If the capacitor of a single-phase motor is short-circuited_________?

6 / 50

The material commonly used for insulation in high voltage cables is_______________?

7 / 50

Which of the following AC motors is usually used in large motor-generator sets?

8 / 50

The only difference between construction of D.C generator and A.C generator is that of_______________?

9 / 50

By which of the following the control action is determined when a man walks along a path ?

10 / 50

Which of the following waves has the highest value of peak factor ___________?

11 / 50

In fuel cell, the ___________ energy is converted into electrical energy?

12 / 50

The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?

13 / 50

In case of D.C. machines, mechanical losses are primary function of____________?

14 / 50

Which of the following motor is preferred for operation in highly explosive atmosphere ?

15 / 50

The practical illustration of the phenomenon of mutual induction is____________?

16 / 50

Which of the following capacitors preferred for high frequency circuits ?

17 / 50

To get the speed of D.C, motor below the normal without wastage of electrical energy is used?

18 / 50

The minimum clearance between the ground and a 220 kV line is about_________________?

19 / 50

The electric field at a point situated at a distance d from straight charged conductor is____________?

20 / 50

__________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?

21 / 50

Choppers is a_______________?

22 / 50

Which of the following medium is employed for extinction of arc in air circuit breaker?

23 / 50

Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is______________?

24 / 50

In the left hand rule, forefinger always represents______________?

25 / 50

The superconductivity is due to____________?

26 / 50

In a phase shift oscillator, the frequency determining elements are _______________?

27 / 50

The effects of EMI can be reduced by____________?

28 / 50

If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?

29 / 50

In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance ?

30 / 50

Persons preparing electrolyte should wear___________?

31 / 50

If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor__________?

32 / 50

Which circuit element(s) will oppose the change in circuit current ?

33 / 50

One condition for oscillation is_____________?

34 / 50

A JFET has high input impedance because _________________?

35 / 50

Overload relays are of_______________type

36 / 50

The voltage gain of a transistor connected in common collector arrangement is____________?

37 / 50

A modern power semiconductor device that combines the characteristic of BJT and MOSFET is_____________?

38 / 50

Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of_____________?

39 / 50

The relay with inverse time characteristic will operate within____________?

40 / 50

The conductors have transport phenomena of electrons due to____________?

41 / 50

If a charged rod is brought closer to a gas filled balloon then______________?

42 / 50

If a D.C. series motor is operated on A.C. supply, it will____________?

43 / 50

An OR gate has 6 inputs. The number of input words in its truth table are________________?

44 / 50

Magnetic flux has the unit of

45 / 50

Most of the fractional horsepower motors have either___________?

46 / 50

In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?

47 / 50

If all the SCR?s of 3 phase PAC is replaced by diodes, they would be triggered_____________?

48 / 50

A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________?

49 / 50

The use of higher flux density in the transformer design____________?

50 / 50

A capacitance of 100 fiF is connected in series with a resistance of 8000 ?2. The time constant of the circuit is______________?

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