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Is a convolution linear?

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For a D.C. machines laboratory following type of D.C. supply will be suitable induction motor D.C. generator set.

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2 answers 43 views

In dc machines, the armature windings are placed on the rotor because of the necessity for  (1) electromechanical energy conversion (2) generation of voltage (3) commutation (4) development of torque

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 66 views

For protection of rotating machines against lightning surges _______ is used.  (1) lightning arrester (2) capacitor (3) combination of lightning arrester and capacitor (4) lightning conductor and arrester

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 55 views

The inertia constants of two groups of machines which do not swing together are M1 and M2. The equivalent inertia constant of the system is

asked May 3, 2018 in Electrical Machine by Shimroz123
1 answer 8 views

for the voltage built-up a self-excited D.C. generator, which of the following is not an essential condition.  1.there must be some residual flux  2.field winding mmf must aid the residual flux  3.total field circuit resistance must be less than t critical value  4.armature speed must be very high

asked May 13, 2018 in DC generator by Shimroz123
1 answer 12 views

Laminated cores, in electrical machines, are used to reduce?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 29 views

Silicon steel is used in electrical machines because it has?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
2 answers 23 views

Losses which occur in rotating electric machines and do not occur in transformers are?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 13 views

What will happen if the primary of a transformer is connected to D.C. supply?  (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn 

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

Which of the following quantity maintains the same direction whether a D.C. machine runs as a generator or as a motor a. Induced e.m.f. b. Armature Current c. Field Current d. Supply Current  

asked Sep 1, 2018 by Shimroz123
1 answer 17 views

For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

asked Mar 20, 2018 in DC generator by Shimroz123
1 answer 14 views
1 answer 12 views

Identify type of BJT configuration having following features : (i) BJT configuration having the least current gain. (ii) KIT configuration called as voltage follower. (iii) BJT configuration having current gain less than one. (iv) BJT configuration suitable for impedance matching. (v) BIT configuration suitable for voltage amplification. (vi) BJT configuration having the least output impedance.  

asked 6 days ago in Elements of Electronics by Shimroz123
0 answers 7 views

Hay bridge is suitable for measuring following type of inductance (a) having Q greater than 10. (b) having Q less than 10. (c) having any value of Q. (d) having phase angle of reactance very large. 

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 23 views

In a d.c. series motor, the torque developed is 20 Nm at 10A. If the load current is doubled, the new torque will be : -  a) 60 Nm b) 45 Nm c) 80 Nm d) 100 Nm

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
0 answers 23 views

Which of the following motors would not be suitable for use as servomotors?  (a) AC induction motor (b) brushless AC motor (c) stepper motor (d) permanent magnet DC motor

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
0 answers 14 views

For a two port symmetric bilateral network, if A= 3Ω and B = 1Ω, the value of parameter C will be  (A) 4s (B) 6s (C) 8s (D) 16s

asked Apr 5, 2018 in Electrical Engineering by Zeeshan
1 answer 3 views

The voltage built-up process of a d.c. generator is  1. difficult 2. delayed 3. cumulative 4. Infinite 

asked May 13, 2018 in DC generator by Shimroz123

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