Electrical Engineering Quiz 35
1 / 50
In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?
2 / 50
Instrument transformers are_______________?
3 / 50
An OPAMP has a slew rate of 5 V/? S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/?S.
4 / 50
In a single phase rotary converter the number of slip rings will be_____________?
5 / 50
The thickness of insulation provided on the conductor depends on_____________?
6 / 50
If a shunt motor is started with its field winding open then?
7 / 50
A transistor amplifier has high output impedance because ______________?
8 / 50
Extent of corrosion in the underground metal work depends upon___________?
9 / 50
The maximum torque in an induction motor depends on___________?
10 / 50
In jaw crushers a motor has to often start against ____________________ load?
11 / 50
If a D.C. motor is connected across the A.C. supply it will_______________?
12 / 50
A zener diode is always_______________ connected?
13 / 50
Dielectric strength of mica is___________?
14 / 50
A capacitor is a perfect insulator for______________?
15 / 50
How can we protect SCR from thermal conditions _____________?
16 / 50
Short-circuiter is used in_____________?
17 / 50
Which of the following heating methods has maximum power factor ?
18 / 50
For testing appliances, the wattage of test lamp should be_____________?
19 / 50
Overfluxing protection is recommended for_____________?
20 / 50
The starting resistance of a D.C. motor is generally_______________?
21 / 50
Which of the following is the disadvantage of static capacitor for power factor improvement?
22 / 50
Which of the following battery is used for air-craft _____________?
23 / 50
Energy stored by a coil is doubled when its current is increased by percent___________?
24 / 50
Most common form of A.C. meters met with in every day domestic and industrial installations are______________?
25 / 50
An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?
26 / 50
Burning out of winding is due to___________?
27 / 50
In a control system integral error compensation _________________ steady state error?
28 / 50
Sumpner?s test is conducted on transformers to determine_____________?
29 / 50
In a non-uniform electric field a polar molecule will experience____________?
30 / 50
The winding where dummy coils are used is sometimes called______________?
31 / 50
The material generally used for armour of high voltage cables is_____________?
32 / 50
Which of the following methods of heating is not dependent on the frequency of supply ?
33 / 50
Magnitude of current at resonance in R-L-C circuit________?
34 / 50
Transformer coupling can be used in______________amplifiers?
35 / 50
Double edge modulation eliminates certain harmonics when the reference is a__________?
36 / 50
When either L or C is increased, the resonant frequency of LC circuit ____________?
37 / 50
In a substation the following equipment is not installed?
38 / 50
When the armature of a D.C. motor rotates, e.m.f. induced is___________?
39 / 50
In a particular biasing circuit, the value of RE is about _________________?
40 / 50
An SCR is considered to be a semi controlled device because_______?
41 / 50
Thermal overload relays are used to protect the motor against over current due to____________?
42 / 50
Batteries are charged by_____________?
43 / 50
D.C. series generator is used_________________?
44 / 50
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
45 / 50
An SCR is a solid state equivalent of ______________?
46 / 50
If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ______________?
47 / 50
The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?
48 / 50
Which of the following is not a vector ___________?
49 / 50
Wagner earthing device is used to eliminate errors due to________________?
50 / 50
Which of following devices has highest di/dt and dv/dt capability?
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