Electrical Engineering Quiz 40
1 / 50
The delay fuses are used for the protection of ___________?
2 / 50
A current amplification of 2000 is a gain of_________________?
3 / 50
When a transistor is driven to cut off, ideally the output is _______________?
4 / 50
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
5 / 50
Voltage Series feedback also called series-shunt feedback) results in__________?
6 / 50
For an overhead line, the surge impedance is taken as________________?
7 / 50
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
8 / 50
Very large values of modulation index (greater than 3.24) lead to___________?
9 / 50
Dynamic equalising circuit is useful____________?
10 / 50
Conductance : mho :: ____________?
11 / 50
In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?
12 / 50
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
13 / 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 ?
14 / 50
Dielectric strength of medium____________?
15 / 50
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
16 / 50
method has leading power factor____________?
17 / 50
Basically a potentiometer is a device for________________?
18 / 50
In a pure resistive circuit__________?
19 / 50
The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
20 / 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___________?
21 / 50
The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?
22 / 50
A Weston frequency meter is_____________?
23 / 50
The term ?cogging? is associated with___________?
24 / 50
In CE arrangement, the value of input impedance is approximately equal to ______________?
25 / 50
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
26 / 50
The series field of a short-shunt D.C. generator is excited by_______________?
27 / 50
The power demand can be estimated approximately by____________?
28 / 50
Magnetic field in a D.C. generator is produced by_______________?
29 / 50
Murray loop test can be used for location of________________?
30 / 50
In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
31 / 50
A switch has ______________?
32 / 50
The rupture of co-valent bonds will occur when the electric field is__________________?
33 / 50
Electric current passing through the circuit produces_____________?
34 / 50
Power amplifiers generally use transformer coupling because transformer permits______________?
35 / 50
Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?
36 / 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)?
37 / 50
1 db corresponds to_____________change in voltage or current level?
38 / 50
Which of the following can be measured by the use of a tachogenerator ?
39 / 50
For which of the following protection from negative sequence currents is provided ?
40 / 50
The input resistance of a VTVM is about ______________?
41 / 50
An emitter follower has ______________input impedance?
42 / 50
The ac voltage controller can be used for ___________?
43 / 50
Effect of moisture on the insulating materials is to________________?
44 / 50
The motor used on small lathes is usually_________?
45 / 50
The surge resistance of cable is__________?
46 / 50
Capacitive susceptance is a measure of__________?
47 / 50
A fuse is never inserted in____________?
48 / 50
In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?
49 / 50
need frequent starting and stopping of electric motors ?
50 / 50
The lead-acid cell should never be discharged beyond____________?
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