Electrical Engineering Quiz 40
1 / 50
The series field of a short-shunt D.C. generator is excited by_______________?
2 / 50
A series resonant band-pass filter consists of a 2 mH coil, a 0.005 ?F capacitor, and a 120 ? resistor. The winding resistance of the coil is 12 ?. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
3 / 50
need frequent starting and stopping of electric motors ?
4 / 50
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
5 / 50
The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?
6 / 50
For an overhead line, the surge impedance is taken as________________?
7 / 50
In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
8 / 50
A switch has ______________?
9 / 50
Capacitive susceptance is a measure of__________?
10 / 50
The power demand can be estimated approximately by____________?
11 / 50
A Weston frequency meter is_____________?
12 / 50
Power amplifiers generally use transformer coupling because transformer permits______________?
13 / 50
In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?
14 / 50
Dynamic equalising circuit is useful____________?
15 / 50
The input resistance of a VTVM is about ______________?
16 / 50
An amplifier without feedback has a voltage gain of 50,input resistance os 1 K? & Output resistance of 2.5K?.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
17 / 50
A fuse is never inserted in____________?
18 / 50
In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?
19 / 50
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
20 / 50
The term ?cogging? is associated with___________?
21 / 50
Conductance : mho :: ____________?
22 / 50
Basically a potentiometer is a device for________________?
23 / 50
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
24 / 50
The ac voltage controller can be used for ___________?
25 / 50
The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
26 / 50
In CE arrangement, the value of input impedance is approximately equal to ______________?
27 / 50
A current amplification of 2000 is a gain of_________________?
28 / 50
Very large values of modulation index (greater than 3.24) lead to___________?
29 / 50
The lead-acid cell should never be discharged beyond____________?
30 / 50
The delay fuses are used for the protection of ___________?
31 / 50
When a transistor is driven to cut off, ideally the output is _______________?
32 / 50
An emitter follower has ______________input impedance?
33 / 50
The surge resistance of cable is__________?
34 / 50
Electric current passing through the circuit produces_____________?
35 / 50
Murray loop test can be used for location of________________?
36 / 50
Dielectric strength of medium____________?
37 / 50
Effect of moisture on the insulating materials is to________________?
38 / 50
Magnetic field in a D.C. generator is produced by_______________?
39 / 50
For which of the following protection from negative sequence currents is provided ?
40 / 50
The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
41 / 50
method has leading power factor____________?
42 / 50
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
43 / 50
Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?
44 / 50
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
45 / 50
In a pure resistive circuit__________?
46 / 50
Voltage Series feedback also called series-shunt feedback) results in__________?
47 / 50
1 db corresponds to_____________change in voltage or current level?
48 / 50
The rupture of co-valent bonds will occur when the electric field is__________________?
49 / 50
Which of the following can be measured by the use of a tachogenerator ?
50 / 50
The motor used on small lathes is usually_________?
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