Trade Theory – Semester II (July 2018) MCQ
- Primary winding of a transformer will be short circuited if:
- (A) DC supply is applied
- (B) AC supply is applied
- (C) Input impedance is increased
- (D) All of these
- The transformer whose induced secondary voltage is the same as the applied primary voltage is called:
- (A) Auto Transformer
- (B) Current Transformer
- (C) Constant Voltage Transformer
- (D) Isolation Transformer
- A transformer is rated in:
- (A) KW
- (B) KVAr
- (C) KVA
- (D) KV
- Tapping of a transformer is generally provided on:
- (A) HV side
- (B) LV side
- (C) Any side
- (D) Both HV & LV side
- Short circuit test of a transformer determines:
- (A) Core loss
- (B) Copper loss
- (C) Iron loss
- (D) Hysteresis loss
- A multiplier for a voltmeter is:
- (A) High resistance in series with the meter
- (B) High resistance in parallel with the meter
- (C) Low resistance in series
- (D) Low resistance in both series and parallel
- If two inputs of a CRO are sinusoidal and 90° out of phase, the pattern generated will be:
- (A) Straight line at 45°
- (B) Oval shape
- (C) Vertical line
- (D) Circle
- The heart of a Cathode Ray Oscilloscope is:
- (A) Saw tooth generator
- (B) Cathode Ray Tube
- (C) Horizontal amplifier
- (D) Vertical amplifier
- In Y-connected transformer secondary, the relation between line current (IL) and phase current (Iph) is:
- (A) IL = Iph
- (B) IL = √3 Iph
- (C) Iph = √3 IL
- (D) IL = 3 Iph
- ELCB is used for:
- (A) Open circuit protection
- (B) Short circuit protection
- (C) Personnel shock protection
- (D) All of these
- A full wave rectifier with capacitor filter is used for:
- (A) Half wave rectification
- (B) Full wave rectification
- (C) Rectification and ripple filtering
- (D) Any of these
- An analog multimeter can measure:
- (A) Resistance
- (B) Voltage
- (C) Current
- (D) All of these
- If a 10:1 transformer is supplied with 20V DC, the secondary voltage will be:
- (A) 2 V DC
- (B) 2 V AC
- (C) 200 V DC
- (D) Zero
- An induction type measuring instrument is used for measurement of:
- (A) AC
- (B) DC
- (C) Both AC and DC
- (D) Any of AC or DC
- The insulation resistance is measured by:
- (A) Ohm meter
- (B) Insulation meter
- (C) Megger
- (D) Wien bridge
- The chemical used in the breather of a transformer is:
- (A) Potassium chlorate
- (B) Silica gel
- (C) Potassium dichromate
- (D) Sodium silicate
- The device which detects internal faults in a transformer using gas is:
- (A) Air break switch
- (B) Gas thermostat
- (C) Buchholz relay
- (D) Reed relay
- PMMC instruments are used for:
- (A) DC measurement
- (B) AC measurement
- (C) Both AC/DC
- (D) Calibration
- PVC stands for:
- (A) Poly variable conductor
- (B) Poly vinyl chloride
- (C) Pre verified conductor
- (D) Poly voltage chloride
- The heating coil in an electric iron is insulated from metallic body using:
- (A) Varnish
- (B) PVC coating
- (C) Mica film
- (D) Porcelain