Electrical Engineering Quiz 12
1 / 50
In the left hand rule, forefinger always represents______________?
2 / 50
If a D.C. series motor is operated on A.C. supply, it will____________?
3 / 50
If the capacitor of a single-phase motor is short-circuited_________?
4 / 50
A capacitance of 100 fiF is connected in series with a resistance of 8000 ?2. The time constant of the circuit is______________?
5 / 50
The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?
6 / 50
A JFET has high input impedance because _________________?
7 / 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 ?
8 / 50
By which of the following the control action is determined when a man walks along a path ?
9 / 50
The superconductivity is due to____________?
10 / 50
The material commonly used for insulation in high voltage cables is_______________?
11 / 50
One condition for oscillation is_____________?
12 / 50
Choppers is a_______________?
13 / 50
Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of_____________?
14 / 50
If all the SCR?s of 3 phase PAC is replaced by diodes, they would be triggered_____________?
15 / 50
In fuel cell, the ___________ energy is converted into electrical energy?
16 / 50
An OR gate has 6 inputs. The number of input words in its truth table are________________?
17 / 50
In a phase shift oscillator, the frequency determining elements are _______________?
18 / 50
The only difference between construction of D.C generator and A.C generator is that of_______________?
19 / 50
In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?
20 / 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__________?
21 / 50
Which of the following medium is employed for extinction of arc in air circuit breaker?
22 / 50
Which of the following waves has the highest value of peak factor ___________?
23 / 50
Most of the fractional horsepower motors have either___________?
24 / 50
If a charged rod is brought closer to a gas filled balloon then______________?
25 / 50
Which circuit element(s) will oppose the change in circuit current ?
26 / 50
The minimum clearance between the ground and a 220 kV line is about_________________?
27 / 50
Persons preparing electrolyte should wear___________?
28 / 50
Which of the following capacitors preferred for high frequency circuits ?
29 / 50
The conductors have transport phenomena of electrons due to____________?
30 / 50
If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?
31 / 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_____________?
32 / 50
The voltage gain of a transistor connected in common collector arrangement is____________?
33 / 50
Magnetic flux has the unit of
34 / 50
__________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
35 / 50
The relay with inverse time characteristic will operate within____________?
36 / 50
The practical illustration of the phenomenon of mutual induction is____________?
37 / 50
Overload relays are of_______________type
38 / 50
The use of higher flux density in the transformer design____________?
39 / 50
To get the speed of D.C, motor below the normal without wastage of electrical energy is used?
40 / 50
Which of the following AC motors is usually used in large motor-generator sets?
41 / 50
A modern power semiconductor device that combines the characteristic of BJT and MOSFET is_____________?
42 / 50
An alternating current or voltage________________?
43 / 50
The effects of EMI can be reduced by____________?
44 / 50
Which of the following motors can be run on AC as well as D.C. supply ?
45 / 50
In case of D.C. machines, mechanical losses are primary function of____________?
46 / 50
If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?
47 / 50
The electric field at a point situated at a distance d from straight charged conductor is____________?
48 / 50
Which of the following motor is preferred for operation in highly explosive atmosphere ?
49 / 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______________?
50 / 50
____________is the reserved generating capacity available for service under emergency conditions which is not kept in operation but in working order.
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