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