Electrical Engineering Quiz 40
1 / 50
method has leading power factor____________?
2 / 50
The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
3 / 50
A current amplification of 2000 is a gain of_________________?
4 / 50
Murray loop test can be used for location of________________?
5 / 50
Dielectric strength of medium____________?
6 / 50
The rupture of co-valent bonds will occur when the electric field is__________________?
7 / 50
The surge resistance of cable is__________?
8 / 50
The delay fuses are used for the protection of ___________?
9 / 50
Very large values of modulation index (greater than 3.24) lead to___________?
10 / 50
An emitter follower has ______________input impedance?
11 / 50
The input resistance of a VTVM is about ______________?
12 / 50
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
13 / 50
The series field of a short-shunt D.C. generator is excited by_______________?
14 / 50
The ac voltage controller can be used for ___________?
15 / 50
Conductance : mho :: ____________?
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
Electric current passing through the circuit produces_____________?
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
Voltage Series feedback also called series-shunt feedback) results in__________?
20 / 50
The lead-acid cell should never be discharged beyond____________?
21 / 50
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
22 / 50
Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?
23 / 50
The power demand can be estimated approximately by____________?
24 / 50
The term ?cogging? is associated with___________?
25 / 50
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
26 / 50
When a transistor is driven to cut off, ideally the output is _______________?
27 / 50
Power amplifiers generally use transformer coupling because transformer permits______________?
28 / 50
In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?
29 / 50
Basically a potentiometer is a device for________________?
30 / 50
Which of the following can be measured by the use of a tachogenerator ?
31 / 50
The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?
32 / 50
1 db corresponds to_____________change in voltage or current level?
33 / 50
The motor used on small lathes is usually_________?
34 / 50
In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
35 / 50
In a pure resistive circuit__________?
36 / 50
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
37 / 50
A switch has ______________?
38 / 50
Capacitive susceptance is a measure of__________?
39 / 50
Magnetic field in a D.C. generator is produced by_______________?
40 / 50
In CE arrangement, the value of input impedance is approximately equal to ______________?
41 / 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 ?
42 / 50
need frequent starting and stopping of electric motors ?
43 / 50
For an overhead line, the surge impedance is taken as________________?
44 / 50
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
45 / 50
A Weston frequency meter is_____________?
46 / 50
A fuse is never inserted in____________?
47 / 50
Effect of moisture on the insulating materials is to________________?
48 / 50
For which of the following protection from negative sequence currents is provided ?
49 / 50
Dynamic equalising circuit is useful____________?
50 / 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)?
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