1. Which one of the following is correct ? (a) The effect of field current on main flux of a synchronous machine is called armature reaction (b) The effect of air gap flux on armature current of a synchronous machine is called armature reaction (c) The effect of armature current on main flux of a …
1. If in an R-L-C series circuit the current lags the applied voltage by 60° then (a) XL – XC = R/√3 (b) XL – XC = √3R (c) XL = XC = R (d) XL – XC = R 2. A lossy capacitor with loss angle of 0.01 radian, draws a current of 0.5 …
1. The value of voltage across the diode in figure given below is (a) Zero volt (b) 4 V (c) 8 V (d) Depends upon the value of R 2. The temperature co-efficient of an intrinsic semiconductor is (a) Zero (b) Positive (c) Negative (d) Like that of metals 3. A 4-pole, 1200 rpm DC …
1. The value of current I flowing in the 1 ohm resistor in the circuit shown in the figure below will be (a) 10A (b) 6A (c) 5A (d) zero 2. In the figure shown below, if we connect a source of 2V, with internal resistance of 1 ohm at AA’ with positive terminal at …
1. The Forth Military World Games were held in October, 2007 in India at (a) Hydrabad (b) Chennai (c) Ahmedaba (d) Lucknow 2. Who of the following received the Sanskriti Award for 2007 in the field of literature? (a) Jyotshna Kalita (b) K.A. Shaji (c) K.P. Reji (d) Bijayini Satpathy 3. The legislative Council in …
1. The best conductor of heat among liquids is (a) water (b) mercury (c) ether (d) alcohol 2. The layer of the atmosphere which reflects ratio waves back to the earth is called (a) Stratosphere (b) Tropopause (c) Ionosphere (d) Troposphere 3. An object weigth maximum in (a) air (b) water (c) hydrogen (d) vacuum …
Refrigeration| MCQ 1. A one tonne refrigerating machine means that (a) the total weight of the machine is one tonne. (b) the quantity of the refrigerant used is one tonne. (c) one tonne of water can be converted into ice. (d) one tonne of ice when melts from and at 0°C in 24 hours, the …
1. A transformer will work on (i) a.c. only (ii) d.c. only (iii) a.c. as well as d.c (iv) none of the above 2. The primary and secondary of a transformer are ……… coupled. (i) electrically (ii) magnetically (iii) electrically and magnetically (iv) none of the above 3. A transformer is an efficient device because …
1. The yoke of a d.c. machine is made of (i) silicon steel (ii) soft iron (iii) aluminium (iv) cast steel 2. The armature of a d.c. machine is made of (i) silicon steel (ii) wrought iron (iii) cast steel (iv) soft iron 3. The coupling field between electrical and mechanical systems of a d.c. …
