Electrical Engineering Quiz 9
1 / 50
Which of the following methods is used for air cooling of turbo-alternators ?
2 / 50
The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
3 / 50
Most efficient plants are normally used as____________?
4 / 50
For the induced draught the fan is located_______________?
5 / 50
Four 8 ? speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?
6 / 50
The maximum power developed in a synchronous motor occurs at a coupling angle of____________?
7 / 50
In a Schering bridge the potential of the detector above earth potential is______________?
8 / 50
No-load speed of which of the following motor will be highest ?
9 / 50
increases the steady state accuracy?
10 / 50
The d.c. resistance of a crystal diode is ______________ its a.c. resistance?
11 / 50
In a D.C. machine the current per brush arm should not be more than_____________?
12 / 50
The conduction of electricity, in semiconductors, takes place due to movement of______________?
13 / 50
During gate recovery time_____________?
14 / 50
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will__________
15 / 50
A single phase full bridge inverter can operated in load commutation mode in case load consist of______?
16 / 50
A multirangq instrument has________________?
17 / 50
Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
18 / 50
Which one is most suitable power device for high frequency (>100 KHz) switching application?
19 / 50
Which of the following motors is used in tape-recorders ____________?
20 / 50
When load current is zero, the Zener current will be_____________?
21 / 50
For which of the following power plants highly skilled engineers are required for running the plants?
22 / 50
Which of the following applications always have some load whenever switched on ?
23 / 50
The number of stages that can be directly coupled is limited because___________?
24 / 50
The bridge used for the measurement of the value of the capacitance is____________?
25 / 50
If P is the power of a star connected system then what will be power of an equivalent delta connected system?
26 / 50
For a diesel generating station the useful life is expected to be around_________Years?
27 / 50
Due to non sinusoidal waveform of the input current, the power factor of the rectifier is____________?
28 / 50
A semiconductor is formed by ______________bonds?
29 / 50
The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?
30 / 50
As -the load is increased the speed of D.C. shunt motor will____________?
31 / 50
A 25eV electron has a speed of______________?
32 / 50
Which of the following drives is suitable for mines where explosive gas exists ?
33 / 50
In hydro power plant, the graph between discharge and time is known as___________?
34 / 50
When a crystal diode is used as a rectifier, the most important consideration is ____________?
35 / 50
A tuned amplifier uses__________load?
36 / 50
In D.C. shunt motors as load is reduced__________________?
37 / 50
If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
38 / 50
Distribution transformers are generally designed for maximum efficiency around________________?
39 / 50
The parallel combination of a 6.8 k? resistor and a 10 k? resistor is in series with the parallel combination of a 2.2 k? resistor and a 1 k? resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)___________?
40 / 50
When one leg of parallel circuit is opened out the total current will______________?
41 / 50
For derries and winches which of the following drives can be used ?
42 / 50
In rectifiers, load current flow is_________?
43 / 50
There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 m The current through the fourth resistor is______________?
44 / 50
The phosphors for which of the following pair are 180? out of phase for VL, VC and VR______?
45 / 50
A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?
46 / 50
Which of the following is not a routine test on transformers ?
47 / 50
With feed back __________ reduces?
48 / 50
The typical time of rising time lies between______________?
49 / 50
Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
50 / 50
The main disadvantage of a mechanical switch is that it_______________?
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